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Showing 1-20 of about 186 results.
The High-redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: Radio Source PropertiesGolden-Marx, EmmetBlanton, E. L.Paterno-Mahler, R.Brodwin, M.Ashby, M. L. N.Moravec, E.Shen, L.Lemaux, B. C.Lubin, L. M.Gal, R. R.Tomczak, A. R.DOI: info:10.3847/1538-4357/abcd96v. 90765
Golden-Marx, Emmet, Blanton, E. L., Paterno-Mahler, R., Brodwin, M., Ashby, M. L. N., Moravec, E., Shen, L., Lemaux, B. C., Lubin, L. M., Gal, R. R., and Tomczak, A. R. 2021. "The High-redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: Radio Source Properties." The Astrophysical Journal 907:65. https://doi.org/10.3847/1538-4357/abcd96
ID: 159626
Type: article
Authors: Golden-Marx, Emmet; Blanton, E. L.; Paterno-Mahler, R.; Brodwin, M.; Ashby, M. L. N.; Moravec, E.; Shen, L.; Lemaux, B. C.; Lubin, L. M.; Gal, R. R.; Tomczak, A. R.
Abstract: The shape of bent, double-lobed radio sources requires a dense gaseous medium. Bent sources can therefore be used to identify galaxy clusters and characterize their evolutionary history. By combining radio observations from the Very Large Array Faint Images of the Radio Sky at Twenty centimeters (VLA FIRST) survey with optical and infrared imaging of 36 red sequence selected cluster candidates from the high-z Clusters Occupied by Bent Radio AGN (COBRA) survey (0.35 < z < 2.2), we find that radio sources with narrower opening angles reside in richer clusters, indicating that the cluster environment impacts radio morphology. Within these clusters, we determine 55.5% of our radio host galaxies are brightest cluster galaxies (BCGs) and that the remainder are associated with other luminous galaxies. The projected separations between the radio sources and cluster centers and the sizes of the opening angles of bent sources follow similar distributions for BCG and non-BCG host populations, suggesting that COBRA host galaxies are either BCGs or galaxies that may evolve into BCGs. By measuring the orientation of the radio sources relative to the cluster centers, we find between 30% and 42% of COBRA bent sources are outgoing and have passed through the cluster center, while between 8% and 58% of COBRA bent sources are infalling. Although these sources typically do not follow directly radial paths, the large population of outgoing sources contrasts what is observed in low-z samples of bent sources and may indicate that the intracluster medium is less dense in these high-z clusters.
Optical and near-infrared observations of the SPT2349-56 proto-cluster core at z = 4.3Rotermund, K. M.Chapman, S. C.Phadke, K. A.Hill, R.Pass, E.Aravena, M.Ashby, M. L. N.Babul, A.Béthermin, M.Canning, R.de Breuck, C.Dong, C.Gonzalez, A. H.Hayward, C. C.Jarugula, S.Marrone, D. P.Narayanan, D.Reuter, C.Scott, D.Spilker, J. S.Vieira, J. D.Wang, G.Weiß, A.DOI: info:10.1093/mnras/stab103v. 5021797–1815
Rotermund, K. M., Chapman, S. C., Phadke, K. A., Hill, R., Pass, E., Aravena, M., Ashby, M. L. N., Babul, A., Béthermin, M., Canning, R., de Breuck, C., Dong, C., Gonzalez, A. H., Hayward, C. C., Jarugula, S., Marrone, D. P., Narayanan, D., Reuter, C., Scott, D., Spilker, J. S., Vieira, J. D., Wang, G., and Weiß, A. 2021. "Optical and near-infrared observations of the SPT2349-56 proto-cluster core at z = 4.3." Monthly Notices of the Royal Astronomical Society 502:1797– 1815. https://doi.org/10.1093/mnras/stab103
ID: 159272
Type: article
Authors: Rotermund, K. M.; Chapman, S. C.; Phadke, K. A.; Hill, R.; Pass, E.; Aravena, M.; Ashby, M. L. N.; Babul, A.; Béthermin, M.; Canning, R.; de Breuck, C.; Dong, C.; Gonzalez, A. H.; Hayward, C. C.; Jarugula, S.; Marrone, D. P.; Narayanan, D.; Reuter, C.; Scott, D.; Spilker, J. S.; Vieira, J. D.; Wang, G.; Weiß, A.
Abstract: We present Gemini-S and Spitzer-IRAC optical-through-near-IR observations in the field of the SPT2349-56 proto-cluster at z = 4.3. We detect optical/IR counterparts for only 9 of the 14 submillimetre galaxies (SMGs) previously identified by ALMA in the core of SPT2349-56. In addition, we detect four z ∼ 4 Lyman-break galaxies (LBGs) in the 30 arcsec-diameter region surrounding this proto-cluster core. Three of the four LBGs are new systems, while one appears to be a counterpart of one of the nine observed SMGs. We identify a candidate brightest cluster galaxy (BCG) with a stellar mass of $(3.2^{+2.3}_{-1.4})\times 10^{11}$ M. The stellar masses of the eight other SMGs place them on, above, and below the main sequence of star formation at z ≍ 4.5. The cumulative stellar mass for the SPT2349-56 core is at least (12.2 ± 2.8) × 1011 M, a sizeable fraction of the stellar mass in local BCGs, and close to the universal baryon fraction (0.19) relative to the virial mass of the core (1013 M). As all 14 of these SMGs are destined to quickly merge, we conclude that the proto-cluster core has already developed a significant stellar mass at this early stage, comparable to z = 1 BCGs. Importantly, we also find that the SPT2349-56 core structure would be difficult to uncover in optical surveys, with none of the ALMA sources being easily identifiable or constrained through g, r, and i colour selection in deep optical surveys and only a modest overdensity of LBGs over the more extended structure. SPT2349-56 therefore represents a truly dust-obscured phase of a massive cluster core under formation.
The SPTpol Extended Cluster SurveyBleem, L. E.Bocquet, S.Stalder, BrianGladders, M. D.Ade, P. A. R.Allen, S. W.Anderson, A. J.Annis, J.Ashby, Matthew L. N.Austermann, J. E.Avila, S.Avva, J. S.Bayliss, M.Beall, J. A.Bechtol, K.Bender, A. N.Benson, B. A.Bertin, E.Bianchini, F.Blake, C.Brodwin, M.Brooks, D.Buckley-Geer, E.Burke, D. L.Carlstrom, J. E.Rosell, A. CarneroCarrasco Kind, M.Carretero, J.Chang, C. L.Chiang, H. C.Citron, R.Moran, C. CorbettCostanzi, M.Crawford, T. M.Crites, A. T.da Costa, L. N.de Haan, T.De Vicente, J.Desai, S.Diehl, H. T.Dietrich, J. P.Dobbs, M. A.Eifler, T. F.Everett, W.Flaugher, B.Floyd, B.Frieman, J.Gallicchio, J.García-Bellido, J.George, E. M.Gerdes, D. W.Gilbert, A.Gruen, D.Gruendl, R. A.Gschwend, J.Gupta, N.Gutierrez, G.Halverson, N. W.Harrington, N.Henning, J. W.Heymans, C.Holder, G. P.Hollowood, D. L.Holzapfel, W. L.Honscheid, K.Hrubes, J. D.Huang, N.Hubmayr, J.Irwin, K. D.James, David J.Jeltema, T.Joudaki, S.Khullar, G.Klein, M.Knox, L.Kuropatkin, N.Lee, A. T.Li, D.Lidman, C.Lowitz, A.MacCrann, N.Mahler, G.Maia, M. A. G.Marshall, J. L.McDonald, M.McMahon, J. J.Melchior, P.Menanteau, F.Meyer, S. S.Miquel, R.Mocanu, L. M.Mohr, J. J.Montgomery, J.Nadolski, A.Natoli, T.Nibarger, J. P.Noble, G.Novosad, V.Padin, S.Palmese, A.Parkinson, D.Patil, S.Paz-Chinchón, F.Plazas, A. A.Pryke, C.Ramachandra, N. S.Reichardt, C. L.Remolina González, J. D.Romer, A. K.Roodman, A.Ruhl, J. E.Rykoff, E. S.Saliwanchik, B. R.Sanchez, E.Saro, A.Sayre, J. T.Schaffer, K. K.Schrabback, T.Serrano, S.Sharon, K.Sievers, C.Smecher, G.Smith, M.Soares-Santos, M.Stark, Antony A.Story, K. T.Suchyta, E.Tarle, G.Tucker, C.Vanderlinde, K.Veach, T.Vieira, J. D.Wang, G.Weller, J.Whitehorn, N.Wu, W. L. K.Yefremenko, V.Zhang, Y.DOI: info:10.3847/1538-4365/ab6993v. 24725
Bleem, L. E., Bocquet, S., Stalder, Brian, Gladders, M. D., Ade, P. A. R., Allen, S. W., Anderson, A. J., Annis, J., Ashby, Matthew L. N., Austermann, J. E., Avila, S., Avva, J. S., Bayliss, M., Beall, J. A., Bechtol, K., Bender, A. N., Benson, B. A., Bertin, E., Bianchini, F., Blake, C., Brodwin, M., Brooks, D., Buckley-Geer, E., Burke, D. L., Carlstrom, J. E. et al. 2020. "The SPTpol Extended Cluster Survey." The Astrophysical Journal Supplement Series 247:25. https://doi.org/10.3847/1538-4365/ab6993
ID: 156470
Type: article
Authors: Bleem, L. E.; Bocquet, S.; Stalder, Brian; Gladders, M. D.; Ade, P. A. R.; Allen, S. W.; Anderson, A. J.; Annis, J.; Ashby, Matthew L. N.; Austermann, J. E.; Avila, S.; Avva, J. S.; Bayliss, M.; Beall, J. A.; Bechtol, K.; Bender, A. N.; Benson, B. A.; Bertin, E.; Bianchini, F.; Blake, C.; Brodwin, M.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Carlstrom, J. E.; Rosell, A. Carnero; Carrasco Kind, M.; Carretero, J.; Chang, C. L.; Chiang, H. C.; Citron, R.; Moran, C. Corbett; Costanzi, M.; Crawford, T. M.; Crites, A. T.; da Costa, L. N.; de Haan, T.; De Vicente, J.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Dobbs, M. A.; Eifler, T. F.; Everett, W.; Flaugher, B.; Floyd, B.; Frieman, J.; Gallicchio, J.; García-Bellido, J.; George, E. M.; Gerdes, D. W.; Gilbert, A.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gupta, N.; Gutierrez, G.; Halverson, N. W.; Harrington, N.; Henning, J. W.; Heymans, C.; Holder, G. P.; Hollowood, D. L.; Holzapfel, W. L.; Honscheid, K.; Hrubes, J. D.; Huang, N.; Hubmayr, J.; Irwin, K. D.; James, David J.; Jeltema, T.; Joudaki, S.; Khullar, G.; Klein, M.; Knox, L.; Kuropatkin, N.; Lee, A. T.; Li, D.; Lidman, C.; Lowitz, A.; MacCrann, N.; Mahler, G.; Maia, M. A. G.; Marshall, J. L.; McDonald, M.; McMahon, J. J.; Melchior, P.; Menanteau, F.; Meyer, S. S.; Miquel, R.; Mocanu, L. M.; Mohr, J. J.; Montgomery, J.; Nadolski, A.; Natoli, T.; Nibarger, J. P.; Noble, G.; Novosad, V.; Padin, S.; Palmese, A.; Parkinson, D.; Patil, S.; Paz-Chinchón, F.; Plazas, A. A.; Pryke, C.; Ramachandra, N. S.; Reichardt, C. L.; Remolina González, J. D.; Romer, A. K.; Roodman, A.; Ruhl, J. E.; Rykoff, E. S.; Saliwanchik, B. R.; Sanchez, E.; Saro, A.; Sayre, J. T.; Schaffer, K. K.; Schrabback, T.; Serrano, S.; Sharon, K.; Sievers, C.; Smecher, G.; Smith, M.; Soares-Santos, M.; Stark, Antony A.; Story, K. T.; Suchyta, E.; Tarle, G.; Tucker, C.; Vanderlinde, K.; Veach, T.; Vieira, J. D.; Wang, G.; Weller, J.; Whitehorn, N.; Wu, W. L. K.; Yefremenko, V.; Zhang, Y.
Abstract: We describe the observations and resultant galaxy cluster catalog from the 2770 deg2 SPTpol Extended Cluster Survey (SPT-ECS). Clusters are identified via the Sunyaev-Zel'dovich (SZ) effect and confirmed with a combination of archival and targeted follow-up data, making particular use of data from the Dark Energy Survey (DES). With incomplete follow-up we have confirmed as clusters 244 of 266 candidates at a detection significance ξ ≥ 5 and an additional 204 systems at 4 SPTpol Extended Cluster Survey (SPT-ECS). Clusters are identified via the Sunyaev-Zel'dovich (SZ) effect and confirmed with a combination of archival and targeted follow-up data, making particular use of data from the Dark Energy Survey (DES). With incomplete follow-up we have confirmed as clusters 244 of 266 candidates at a detection significance ξ ≥ 5 and an additional 204 systems at 4 SPTpol Extended Cluster Survey (SPT-ECS). Clusters are identified via the Sunyaev-Zel'dovich (SZ) effect and confirmed with a combination of archival and targeted follow-up data, making particular use of data from the Dark Energy Survey (DES). With incomplete follow-up we have confirmed as clusters 244 of 266 candidates at a detection significance ξ ≥ 5 and an additional 204 systems at 4 14 M_{☉} h70-1 and a median redshift of z = 0.49, and we have identified 44 strong gravitational lenses in the sample thus far. Radio data are used to characterize contamination to the SZ signal; the median contamination for confirmed clusters is predicted to be ∼1% of the SZ signal at the ξ > 4 threshold, and 10% of their measured SZ flux. We associate SZ-selected clusters, from both SPT-ECS and the SPT-SZ survey, with clusters from the DES redMaPPer sample, and we find an offset distribution between the SZ center and central galaxy in general agreement with previous work, though with a larger fraction of clusters with significant offsets. Adopting a fixed Planck-like cosmology, we measure the optical richness-SZ mass (λ-M) relation and find it to be 28% shallower than that from a weak-lensing analysis of the DES data - a difference significant at the 4σ level - with the relations intersecting at λ = 60. The SPT-ECS cluster sample will be particularly useful for studying the evolution of massive clusters and, in combination with DES lensing observations and the SPT- SZ cluster sample, will be an important component of future cosmological analyses.
Sub-galactic scaling relations between X-ray luminosity, star formation rate, and stellar massKouroumpatzakis, K.Zezas, AndreasSell, P.Kovlakas, K.Bonfini, P.Willner, Steven P.Ashby, Matthew L. N.Maragkoudakis, A.Jarrett, T. H.DOI: info:10.1093/mnras/staa1063v. 4945967–5984
Kouroumpatzakis, K., Zezas, Andreas, Sell, P., Kovlakas, K., Bonfini, P., Willner, Steven P., Ashby, Matthew L. N., Maragkoudakis, A., and Jarrett, T. H. 2020. "Sub-galactic scaling relations between X-ray luminosity, star formation rate, and stellar mass." Monthly Notices of the Royal Astronomical Society 494:5967– 5984. https://doi.org/10.1093/mnras/staa1063
ID: 157870
Type: article
Authors: Kouroumpatzakis, K.; Zezas, Andreas; Sell, P.; Kovlakas, K.; Bonfini, P.; Willner, Steven P.; Ashby, Matthew L. N.; Maragkoudakis, A.; Jarrett, T. H.
Abstract: X-ray luminosity (LX) originating from high-mass X-ray binaries (HMXBs) is tightly correlated with the host galaxy's star formation rate (SFR). We explore this connection at sub-galactic scales spanning ∼7 dex in SFR and ∼8 dex in specific SFR (sSFR). There is good agreement with established relations down to SFR ≃ 10-3 M $_{\odot }\, \rm {yr^{-1}}$ , below which an excess of X-ray luminosity emerges. This excess likely arises from low-mass X-ray binaries. The intrinsic scatter of the LX-SFR relation is constant, not correlated with SFR. Different star formation indicators scale with LX in different ways, and we attribute the differences to the effect of star formation history. The SFR derived from H α shows the tightest correlation with X-ray luminosity because H α emission probes stellar populations with ages similar to HMXB formation time-scales, but the H α-based SFR is reliable only for $\rm sSFR{\gt }10^{-12}$ M $_{\odot }\, \rm {yr^{-1}}$ /M.
The AGN contribution to the UV-FIR luminosities of interacting galaxies and its role in identifying the main sequenceRamos Padilla, Andrés F.Ashby, M. L. N.Smith, Howard A.Martínez-Galarza, Juan R.Beverage, Aliza G.Dietrich, JeremyHiguera-G., Mario-AWeiner, Aaron S.DOI: info:10.1093/mnras/staa2813v. 4994325–4369
Ramos Padilla, Andrés F., Ashby, M. L. N., Smith, Howard A., Martínez-Galarza, Juan R., Beverage, Aliza G., Dietrich, Jeremy, Higuera-G., Mario-A, and Weiner, Aaron S. 2020. "The AGN contribution to the UV-FIR luminosities of interacting galaxies and its role in identifying the main sequence." Monthly Notices of the Royal Astronomical Society 499:4325– 4369. https://doi.org/10.1093/mnras/staa2813
ID: 158733
Type: article
Authors: Ramos Padilla, Andrés F.; Ashby, M. L. N.; Smith, Howard A.; Martínez-Galarza, Juan R.; Beverage, Aliza G.; Dietrich, Jeremy; Higuera-G., Mario-A; Weiner, Aaron S.
Abstract: Emission from active galactic nuclei (AGNs) is known to play an important role in the evolution of many galaxies including luminous and ultraluminous systems (U/LIRGs), as well as merging systems. However, the extent, duration, and exact effects of its influence are still imperfectly understood. To assess the impact of AGNs on interacting systems, we present a spectral energy distribution (SED) analysis of a sample of 189 nearby galaxies. We gather and systematically re-reduce archival broad-band imaging mosaics from the ultraviolet to the far-infrared using data from GALEX, SDSS, 2MASS, IRAS, WISE, Spitzer, and Herschel. We use spectroscopy from Spitzer/IRS to obtain fluxes from fine-structure lines that trace star formation and AGN activity. Utilizing the SED modelling and fitting tool CIGALE, we derive the physical conditions of the interstellar medium, both in star-forming regions and in nuclear regions dominated by the AGN in these galaxies. We investigate how the star formation rates (SFRs) and the fractional AGN contributions (fAGN) depend on stellar mass, galaxy type, and merger stage. We find that luminous galaxies more massive than about $10^{10} \,\rm {M}_{*}$ are likely to deviate significantly from the conventional galaxy main-sequence relation. Interestingly, infrared AGN luminosity and stellar mass in this set of objects are much tighter than SFR and stellar mass. We find that buried AGNs may occupy a locus between bright starbursts and pure AGNs in the fAGN-[Ne V]/[Ne II] plane. We identify a modest correlation between fAGN and mergers in their later stages.
The CANDELS/SHARDS Multiwavelength Catalog in GOODS-N: Photometry, Photometric Redshifts, Stellar Masses, Emission-line Fluxes, and Star Formation RatesBarro, GuillermoPérez-González, Pablo G.Cava, AntonioBrammer, GabrielPandya, VirajEliche Moral, CarmenEsquej, PilarDomínguez-Sánchez, HelenaAlcalde Pampliega, BelenGuo, YichengKoekemoer, Anton M.Trump, Jonathan R.Ashby, Matthew L. N.Cardiel, NicolasCastellano, MarcoConselice, Christopher J.Dickinson, Mark E.Dolch, TimothyDonley, Jennifer L.Espino Briones, NéstorFaber, Sandra M.Fazio, Giovanni G.Ferguson, HenryFinkelstein, SteveFontana, AdrianoGalametz, AudreyGardner, Jonathan P.Gawiser, EricGiavalisco, MauroGrazian, AndreaGrogin, Norman A.Hathi, Nimish P.Hemmati, ShoubanehHernán-Caballero, AntonioKocevski, DaleKoo, David C.Kodra, DritanLee, Kyoung-SooLin, LihwaiLucas, Ray A.Mobasher, BahramMcGrath, Elizabeth J.Nandra, KirpalNayyeri, HooshangNewman, Jeffrey A.Pforr, JaninePeth, MichaelRafelski, MarcRodríguez-Munoz, LuciaSalvato, MaraStefanon, Maurovan der Wel, ArjenWillner, Steven P.Wiklind, TommyWuyts, StijnDOI: info:10.3847/1538-4365/ab23f2v. 24322
Barro, Guillermo, Pérez-González, Pablo G., Cava, Antonio, Brammer, Gabriel, Pandya, Viraj, Eliche Moral, Carmen, Esquej, Pilar, Domínguez-Sánchez, Helena, Alcalde Pampliega, Belen, Guo, Yicheng, Koekemoer, Anton M., Trump, Jonathan R., Ashby, Matthew L. N., Cardiel, Nicolas, Castellano, Marco, Conselice, Christopher J., Dickinson, Mark E., Dolch, Timothy, Donley, Jennifer L., Espino Briones, Néstor, Faber, Sandra M., Fazio, Giovanni G., Ferguson, Henry, Finkelstein, Steve, Fontana, Adriano et al. 2019. "The CANDELS/SHARDS Multiwavelength Catalog in GOODS-N: Photometry, Photometric Redshifts, Stellar Masses, Emission-line Fluxes, and Star Formation Rates." The Astrophysical Journal Supplement Series 243:22. https://doi.org/10.3847/1538-4365/ab23f2
ID: 154285
Type: article
Authors: Barro, Guillermo; Pérez-González, Pablo G.; Cava, Antonio; Brammer, Gabriel; Pandya, Viraj; Eliche Moral, Carmen; Esquej, Pilar; Domínguez-Sánchez, Helena; Alcalde Pampliega, Belen; Guo, Yicheng; Koekemoer, Anton M.; Trump, Jonathan R.; Ashby, Matthew L. N.; Cardiel, Nicolas; Castellano, Marco; Conselice, Christopher J.; Dickinson, Mark E.; Dolch, Timothy; Donley, Jennifer L.; Espino Briones, Néstor; Faber, Sandra M.; Fazio, Giovanni G.; Ferguson, Henry; Finkelstein, Steve; Fontana, Adriano; Galametz, Audrey; Gardner, Jonathan P.; Gawiser, Eric; Giavalisco, Mauro; Grazian, Andrea; Grogin, Norman A.; Hathi, Nimish P.; Hemmati, Shoubaneh; Hernán-Caballero, Antonio; Kocevski, Dale; Koo, David C.; Kodra, Dritan; Lee, Kyoung-Soo; Lin, Lihwai; Lucas, Ray A.; Mobasher, Bahram; McGrath, Elizabeth J.; Nandra, Kirpal; Nayyeri, Hooshang; Newman, Jeffrey A.; Pforr, Janine; Peth, Michael; Rafelski, Marc; Rodríguez-Munoz, Lucia; Salvato, Mara; Stefanon, Mauro; van der Wel, Arjen; Willner, Steven P.; Wiklind, Tommy; Wuyts, Stijn
Abstract: We present a WFC3 F160W (H-band) selected catalog in the CANDELS/GOODS-N field containing photometry from the ultraviolet (UV) to the far- infrared (IR), photometric redshifts, and stellar parameters derived from the analysis of the multiwavelength data. The catalog contains 35,445 sources over the 171 arcmin2 of the CANDELS F160W mosaic. The 5σ detection limits (within an aperture of radius 0.″17) of the mosaic range between H = 27.8, 28.2, and 28.7 in the wide, intermediate, and deep regions, which span approximately 50%, 15%, and 35% of the total area. The multiwavelength photometry includes broadband data from the UV (U band from KPNO and LBC), optical (HST/ACS F435W, F606W, F775W, F814W, and F850LP), near-to-mid IR (HST/WFC3 F105W, F125W, F140W, and F160W; Subaru/MOIRCS Ks; CFHT/Megacam K; and Spitzer/IRAC 3.6, 4.5, 5.8, and 8.0 μm), and far-IR (Spitzer/MIPS 24 μm, HERSCHEL/PACS 100 and 160 μm, SPIRE 250, 350 and 500 μm) observations. In addition, the catalog also includes optical medium-band data (R ̃ 50) in 25 consecutive bands, λ = 500-950 nm, from the SHARDS survey and WFC3 IR spectroscopic observations with the G102 and G141 grisms (R ̃ 210 and 130). The use of higher spectral resolution data to estimate photometric redshifts provides very high, and nearly uniform, precision from z = 0-2.5. The comparison to 1485 good-quality spectroscopic redshifts up to z ̃ 3 yields ∆z/(1 + z spec) = 0.0032 and an outlier fraction of η = 4.3%. In addition to the multiband photometry, we release value- added catalogs with emission-line fluxes, stellar masses, dust attenuations, UV- and IR-based star formation rates, and rest-frame colors.
Cluster Cosmology Constraints from the 2500 deg2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space TelescopeBocquet, S.Dietrich, J. P.Schrabback, T.Bleem, L. E.Klein, M.Allen, S. W.Applegate, D. E.Ashby, Matthew L. N.Bautz, M.Bayliss, M.Benson, B. A.Brodwin, M.Bulbul, EsraCanning, R. E. A.Capasso, R.Carlstrom, J. E.Chang, C. L.Chiu, I.Cho, H. -MClocchiatti, A.Crawford, T. M.Crites, A. T.de Haan, T.Desai, S.Dobbs, M. A.Foley, R. J.Forman, William R.Garmire, G. P.George, E. M.Gladders, M. D.Gonzalez, A. H.Grandis, S.Gupta, N.Halverson, N. W.Hlavacek-Larrondo, J.Hoekstra, H.Holder, G. P.Holzapfel, W. L.Hou, Z.Hrubes, J. D.Huang, N.Jones, ChristineKhullar, G.Knox, L.Kraft, RalphLee, A. T.von der Linden, A.Luong-Van, D.Mantz, A.Marrone, D. P.McDonald, M.McMahon, J. J.Meyer, S. S.Mocanu, L. M.Mohr, J. J.Morris, R. G.Padin, S.Patil, S.Pryke, C.Rapetti, D.Reichardt, C. L.Rest, A.Ruhl, J. E.Saliwanchik, B. R.Saro, A.Sayre, J. T.Schaffer, K. K.Shirokoff, E.Stalder, BrianStanford, S. A.Staniszewski, Z.Stark, Antony A.Story, K. T.Strazzullo, V.Stubbs, Christopher W.Vanderlinde, K.Vieira, J. D.Vikhlinin, AlexeyWilliamson, R.Zenteno, A.DOI: info:10.3847/1538-4357/ab1f10v. 87855
Bocquet, S., Dietrich, J. P., Schrabback, T., Bleem, L. E., Klein, M., Allen, S. W., Applegate, D. E., Ashby, Matthew L. N., Bautz, M., Bayliss, M., Benson, B. A., Brodwin, M., Bulbul, Esra, Canning, R. E. A., Capasso, R., Carlstrom, J. E., Chang, C. L., Chiu, I., Cho, H. -M, Clocchiatti, A., Crawford, T. M., Crites, A. T., de Haan, T., Desai, S., Dobbs, M. A. et al. 2019. "Cluster Cosmology Constraints from the 2500 deg2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope." The Astrophysical Journal 878:55. https://doi.org/10.3847/1538-4357/ab1f10
ID: 155151
Type: article
Authors: Bocquet, S.; Dietrich, J. P.; Schrabback, T.; Bleem, L. E.; Klein, M.; Allen, S. W.; Applegate, D. E.; Ashby, Matthew L. N.; Bautz, M.; Bayliss, M.; Benson, B. A.; Brodwin, M.; Bulbul, Esra; Canning, R. E. A.; Capasso, R.; Carlstrom, J. E.; Chang, C. L.; Chiu, I.; Cho, H. -M; Clocchiatti, A.; Crawford, T. M.; Crites, A. T.; de Haan, T.; Desai, S.; Dobbs, M. A.; Foley, R. J.; Forman, William R.; Garmire, G. P.; George, E. M.; Gladders, M. D.; Gonzalez, A. H.; Grandis, S.; Gupta, N.; Halverson, N. W.; Hlavacek-Larrondo, J.; Hoekstra, H.; Holder, G. P.; Holzapfel, W. L.; Hou, Z.; Hrubes, J. D.; Huang, N.; Jones, Christine; Khullar, G.; Knox, L.; Kraft, Ralph; Lee, A. T.; von der Linden, A.; Luong-Van, D.; Mantz, A.; Marrone, D. P.; McDonald, M.; McMahon, J. J.; Meyer, S. S.; Mocanu, L. M.; Mohr, J. J.; Morris, R. G.; Padin, S.; Patil, S.; Pryke, C.; Rapetti, D.; Reichardt, C. L.; Rest, A.; Ruhl, J. E.; Saliwanchik, B. R.; Saro, A.; Sayre, J. T.; Schaffer, K. K.; Shirokoff, E.; Stalder, Brian; Stanford, S. A.; Staniszewski, Z.; Stark, Antony A.; Story, K. T.; Strazzullo, V.; Stubbs, Christopher W.; Vanderlinde, K.; Vieira, J. D.; Vikhlinin, Alexey; Williamson, R.; Zenteno, A.
Abstract: We derive cosmological constraints using a galaxy cluster sample selected from the 2500 deg2 SPT-SZ survey. The sample spans the redshift range 0.25 SPT-SZ survey. The sample spans the redshift range 0.25 5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29 5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29 5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29 5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29 5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29 m = 0.276 ± 0.047, σ 8 = 0.781 ± 0.037, and σ 8m/0.3)0.2 = 0.766 ±0.025. The redshift evolutions of the X-ray Y X-mass and M gas-mass relations are both consistent with self-similar evolution to within 1σ. The mass slope of the Y X-mass relation shows a 2.3σ deviation from self-similarity. Similarly, the mass slope of the M gas-mass relation is steeper than self- similarity at the 2.5σ level. In a νwCDM cosmology, we measure the dark energy equation-of-state parameter w = -1.55 ± 0.41 from the cluster data. We perform a measurement of the growth of structure since redshift z ∼ 1.7 and find no evidence for tension with the prediction from general relativity. This is the first analysis of the SPT cluster sample that uses direct weak-lensing mass calibration and is a step toward using the much larger weak-lensing data set from DES. We provide updated redshift and mass estimates for the SPT sample.
The Stellar-to-halo Mass Ratios of Passive and Star-forming Galaxies at z ̃ 2-3 from the SMUVS SurveyCowley, William I.Caputi, Karina I.Deshmukh, SmaranAshby, Matthew L. N.Fazio, Giovanni G.Le Fèvre, OlivierFynbo, Johan P. U.Ilbert, OliverMilvang-Jensen, BoDOI: info:10.3847/1538-4357/ab089bv. 874114
Cowley, William I., Caputi, Karina I., Deshmukh, Smaran, Ashby, Matthew L. N., Fazio, Giovanni G., Le Fèvre, Olivier, Fynbo, Johan P. U., Ilbert, Oliver, and Milvang-Jensen, Bo. 2019. "The Stellar-to-halo Mass Ratios of Passive and Star-forming Galaxies at z ̃ 2-3 from the SMUVS Survey." The Astrophysical Journal 874:114. https://doi.org/10.3847/1538-4357/ab089b
ID: 155240
Type: article
Authors: Cowley, William I.; Caputi, Karina I.; Deshmukh, Smaran; Ashby, Matthew L. N.; Fazio, Giovanni G.; Le Fèvre, Olivier; Fynbo, Johan P. U.; Ilbert, Oliver; Milvang-Jensen, Bo
Abstract: In this work, we use measurements of galaxy stellar mass and two-point angular correlation functions to constrain the stellar-to-halo mass ratios (SHMRs) of passive and star-forming galaxies at z ̃ 2-3, as identified in the Spitzer Matching Survey of the UltraVISTA ultra-deep Stripes. We adopt a sophisticated halo modeling approach to statistically divide our two populations into central and satellite galaxies. For central galaxies, we find that the normalization of the SHMR is greater for our passive population. Through the modeling of Λ cold dark matter halo mass accretion histories, we show that this can only arise if the conversion of baryons into stars was more efficient at higher redshifts and additionally that passive galaxies can be plausibly explained as residing in halos with the highest formation redshifts (i.e., those with the lowest accretion rates) at a given halo mass. At a fixed stellar mass, satellite galaxies occupy host halos with a greater mass than central galaxies, and we find further that the fraction of passive galaxies that are satellites is higher than for the combined population. This, and our derived satellite quenching timescales, combined with earlier estimates from the literature, support dynamical/environmental mechanisms as the dominant process for satellite quenching at z ≲ 3.
The Massive and Distant Clusters of WISE Survey. VI. Stellar Mass Fractions of a Sample of High-redshift Infrared-selected ClustersDecker, BandonBrodwin, MarkAbdulla, ZubairGonzalez, Anthony H.Marrone, Daniel P.O'Donnell, ChristineStanford, S. A.Wylezalek, DominikaCarlstrom, John E.Eisenhardt, Peter R. M.Mantz, AdamMo, WenliMoravec, EmilyStern, DanielAldering, GregAshby, Matthew L. N.Boone, KyleHayden, BrianGupta, NikhelMcDonald, Michael A.DOI: info:10.3847/1538-4357/ab12d7v. 87872
Decker, Bandon, Brodwin, Mark, Abdulla, Zubair, Gonzalez, Anthony H., Marrone, Daniel P., O'Donnell, Christine, Stanford, S. A., Wylezalek, Dominika, Carlstrom, John E., Eisenhardt, Peter R. M., Mantz, Adam, Mo, Wenli, Moravec, Emily, Stern, Daniel, Aldering, Greg, Ashby, Matthew L. N., Boone, Kyle, Hayden, Brian, Gupta, Nikhel, and McDonald, Michael A. 2019. "The Massive and Distant Clusters of WISE Survey. VI. Stellar Mass Fractions of a Sample of High-redshift Infrared-selected Clusters." The Astrophysical Journal 878:72. https://doi.org/10.3847/1538-4357/ab12d7
ID: 152882
Type: article
Authors: Decker, Bandon; Brodwin, Mark; Abdulla, Zubair; Gonzalez, Anthony H.; Marrone, Daniel P.; O'Donnell, Christine; Stanford, S. A.; Wylezalek, Dominika; Carlstrom, John E.; Eisenhardt, Peter R. M.; Mantz, Adam; Mo, Wenli; Moravec, Emily; Stern, Daniel; Aldering, Greg; Ashby, Matthew L. N.; Boone, Kyle; Hayden, Brian; Gupta, Nikhel; McDonald, Michael A.
Abstract: We present measurements of the stellar mass fractions ({f}\star ) for a sample of high-redshift (0.93 ≤ z ≤ 1.32) infrared-selected galaxy clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) and compare them to the stellar mass fractions of Sunyaev–Zel’dovich (SZ) effect-selected clusters in a similar mass and redshift range from the South Pole Telescope (SPT)–SZ Survey. We do not find a significant difference in mean {f}\star between the two selection methods; though, we do find an unexpectedly large range in {f}\star for the SZ-selected clusters. In addition, we measure the luminosity function of the MaDCoWS clusters and find {m}* =19.41+/- 0.07, similar to other studies of clusters at or near our redshift range. Finally, we present SZ detections and masses for seven MaDCoWS clusters and new spectroscopic redshifts for five MaDCoWS clusters. One of these new clusters, MOO J1521+0452 at z = 1.31, is the most distant MaDCoWS cluster confirmed to date.
Multiwavelength Light Curves of Two Remarkable Sagittarius A* FlaresFazio, G. G.Hora, J. L.Witzel, G.Willner, S. P.Ashby, M. L. N.Baganoff, F.Becklin, E.Carey, S.Haggard, D.Gammie, C.Ghez, A.Gurwell, M. A.Ingalls, J.Marrone, D.Morris, M. R.Smith, H. A.DOI: info:10.3847/1538-4357/aad4a2v. 864No. 158
Fazio, G. G., Hora, J. L., Witzel, G., Willner, S. P., Ashby, M. L. N., Baganoff, F., Becklin, E., Carey, S., Haggard, D., Gammie, C., Ghez, A., Gurwell, M. A., Ingalls, J., Marrone, D., Morris, M. R., and Smith, H. A. 2019. "Multiwavelength Light Curves of Two Remarkable Sagittarius A* Flares." The Astrophysical Journal 864 (1):58. https://doi.org/10.3847/1538-4357/aad4a2
ID: 149176
Type: article
Authors: Fazio, G. G.; Hora, J. L.; Witzel, G.; Willner, S. P.; Ashby, M. L. N.; Baganoff, F.; Becklin, E.; Carey, S.; Haggard, D.; Gammie, C.; Ghez, A.; Gurwell, M. A.; Ingalls, J.; Marrone, D.; Morris, M. R.; Smith, H. A.
Abstract: Sgr A*, the supermassive black hole (SMBH) at the center of our Milky Way Galaxy, is known to be a variable source of X-ray, near-infrared (NIR), and submillimeter radiation and therefore a prime candidate to study the electromagnetic radiation generated by mass accretion flow onto a black hole and/or a related jet. Disentangling the power source and emission mechanisms of this variability is a central challenge to our understanding of accretion flows around SMBHs. Simultaneous multiwavelength observations of the flux variations and their time correlations can play an important role in obtaining a better understanding of possible emission mechanisms and their origin. This paper presents observations of two flares that both apparently violate the previously established patterns in the relative timing of submillimeter/NIR/X-ray flares from Sgr A*. One of these events provides the first evidence of coeval structure between NIR and submillimeter flux increases, while the second event is the first example of the sequence of submillimeter/X-ray/NIR flux increases all occurring within ∼1 hr. Each of these two events appears to upend assumptions that have been the basis of some analytic models of flaring in Sgr A*. However, it cannot be ruled out that these events, even though unusual, were just coincidental. These observations demonstrate that we do not fully understand the origin of the multiwavelength variability of Sgr A* and show that there is a continued and important need for long-term, coordinated, and precise multiwavelength observations of Sgr A* to characterize the full range of variability behavior.
The High-redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: Follow-up Optical ImagingGolden-Marx, EmmetBlanton, E. L.Paterno-Mahler, R.Brodwin, M.Ashby, Matthew L. N.Lemaux, B. C.Lubin, L. M.Gal, R. R.Tomczak, A. R.DOI: info:10.3847/1538-4357/ab5106v. 88750
Golden-Marx, Emmet, Blanton, E. L., Paterno-Mahler, R., Brodwin, M., Ashby, Matthew L. N., Lemaux, B. C., Lubin, L. M., Gal, R. R., and Tomczak, A. R. 2019. "The High-redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: Follow-up Optical Imaging." The Astrophysical Journal 887:50. https://doi.org/10.3847/1538-4357/ab5106
ID: 154527
Type: article
Authors: Golden-Marx, Emmet; Blanton, E. L.; Paterno-Mahler, R.; Brodwin, M.; Ashby, Matthew L. N.; Lemaux, B. C.; Lubin, L. M.; Gal, R. R.; Tomczak, A. R.
Abstract: Here we present new red sequence overdensity measurements for 77 fields in the high-z Clusters Occupied by Bent Radio AGN (COBRA) survey, based on r- and i-band imaging taken with the Lowell Observatory's Discovery Channel Telescope. We observe 38 COBRA fields in the r-band and 90 COBRA fields in the i-band. By combining the r- and i-band photometry with our 3.6 and 4.5 μm Spitzer IRAC observations, we identify 39 red sequence cluster candidates that host a strong overdensity of galaxies when measuring the excess of red sequence galaxies relative to a background field. We initially treat the radio host as the cluster center and then determine a new cluster center based on the surface density of red sequence sources. Using our color selection, we identify which COBRA cluster candidates have strong red sequence populations. By removing foreground and background contaminants, we more securely determine which fields include cluster candidates with a higher significance than our single-band observations. Additionally, of the 77 fields we analyze with a redshift estimate, 26 include newly estimated photometric redshifts.
Near-infrared Survey and Photometric Redshifts in the Extended GOODS-North FieldHsu, Li-TingLin, LihwaiDickinson, MarkYan, HaojingBau-Ching, HsiehWang, Wei-HaoLee, Chien-HsiuYan, Chi-HungScott, DouglasWillner, Steven P.Ouchi, MasamiAshby, Matthew L. N.Chen, Yi-WenDaddi, EmanueleElbaz, DavidFazio, Giovanni G.Foucaud, SebastienHuang, JiashengKoo, David C.Morrison, GlennOwen, FrazerPannella, MaurilioPope, AlexendraSimard, LucWang, Shiang-YuDOI: info:10.3847/1538-4357/aaf9a7v. 871233
Hsu, Li-Ting, Lin, Lihwai, Dickinson, Mark, Yan, Haojing, Bau-Ching, Hsieh, Wang, Wei-Hao, Lee, Chien-Hsiu, Yan, Chi-Hung, Scott, Douglas, Willner, Steven P., Ouchi, Masami, Ashby, Matthew L. N., Chen, Yi-Wen, Daddi, Emanuele, Elbaz, David, Fazio, Giovanni G., Foucaud, Sebastien, Huang, Jiasheng, Koo, David C., Morrison, Glenn, Owen, Frazer, Pannella, Maurilio, Pope, Alexendra, Simard, Luc, and Wang, Shiang-Yu. 2019. "Near-infrared Survey and Photometric Redshifts in the Extended GOODS-North Field." The Astrophysical Journal 871:233. https://doi.org/10.3847/1538-4357/aaf9a7
ID: 150499
Type: article
Authors: Hsu, Li-Ting; Lin, Lihwai; Dickinson, Mark; Yan, Haojing; Bau-Ching, Hsieh; Wang, Wei-Hao; Lee, Chien-Hsiu; Yan, Chi-Hung; Scott, Douglas; Willner, Steven P.; Ouchi, Masami; Ashby, Matthew L. N.; Chen, Yi-Wen; Daddi, Emanuele; Elbaz, David; Fazio, Giovanni G.; Foucaud, Sebastien; Huang, Jiasheng; Koo, David C.; Morrison, Glenn; Owen, Frazer; Pannella, Maurilio; Pope, Alexendra; Simard, Luc; Wang, Shiang-Yu
Abstract: We present deep J- and H-band images in the extended Great Observatories Origins Deep Survey-North field covering an area of 0.22 deg2. The observations were taken using WIRCam on the 3.6 m Canada–France–Hawaii Telescope. Together with the reprocessed K s-band image, the 5σ limiting AB magnitudes (in 2″ diameter apertures) are 24.7, 24.2, and 24.4 AB mag in the J, H, and K s bands, respectively. We also release a multiband photometry and photometric redshift catalog containing 93,598 sources. For non-X-ray sources, we obtained a photometric redshift accuracy σ NMAD = 0.036 with an outlier fraction η = 7.3%. For X-ray sources, which are mainly active galactic nuclei (AGNs), we cross-matched our catalog with the updated 2M-CDFN X-ray catalog from Xue et al. and found that 658 out of 683 X-ray sources have counterparts. GALEX UV data are included in the photometric redshift computation for the X-ray sources to give σ NMAD = 0.040 with η = 10.5%. Our approach yields more accurate photometric redshift estimates compared to previous works in this field. In particular, by adopting AGN–galaxy hybrid templates, our approach delivers photometric redshifts for the X-ray counterparts with fewer outliers compared to the 3D-Hubble Space Telescope catalog, which fit these sources with galaxy-only templates.
Spectroscopic Confirmation of Five Galaxy Clusters at z > 1.25 in the 2500 deg2 SPT-SZ SurveyKhullar, G.Bleem, L. E.Bayliss, M. B.Gladders, M. D.Benson, B. A.McDonald, M.Allen, S. W.Applegate, D. E.Ashby, Matthew L. N.Bocquet, S.Brodwin, M.Bulbul, EsraCanning, R. E. A.Capasso, R.Chiu, I.Crawford, T. M.de Haan, T.Dietrich, J. P.Gonzalez, A. H.Hlavacek-Larrondo, J.Hoekstra, H.Holzapfel, W. L.von der Linden, A.Mantz, A. B.Patil, S.Reichardt, C. L.Saro, A.Sharon, K.Stalder, B.Stanford, S. A.Stark, Antony A.Strazzullo, V.DOI: info:10.3847/1538-4357/aaeed0v. 8707
Khullar, G., Bleem, L. E., Bayliss, M. B., Gladders, M. D., Benson, B. A., McDonald, M., Allen, S. W., Applegate, D. E., Ashby, Matthew L. N., Bocquet, S., Brodwin, M., Bulbul, Esra, Canning, R. E. A., Capasso, R., Chiu, I., Crawford, T. M., de Haan, T., Dietrich, J. P., Gonzalez, A. H., Hlavacek-Larrondo, J., Hoekstra, H., Holzapfel, W. L., von der Linden, A., Mantz, A. B., Patil, S. et al. 2019. "Spectroscopic Confirmation of Five Galaxy Clusters at z > 1.25 in the 2500 deg2 SPT-SZ Survey." The Astrophysical Journal 870:7. https://doi.org/10.3847/1538-4357/aaeed0
ID: 150417
Type: article
Authors: Khullar, G.; Bleem, L. E.; Bayliss, M. B.; Gladders, M. D.; Benson, B. A.; McDonald, M.; Allen, S. W.; Applegate, D. E.; Ashby, Matthew L. N.; Bocquet, S.; Brodwin, M.; Bulbul, Esra; Canning, R. E. A.; Capasso, R.; Chiu, I.; Crawford, T. M.; de Haan, T.; Dietrich, J. P.; Gonzalez, A. H.; Hlavacek-Larrondo, J.; Hoekstra, H.; Holzapfel, W. L.; von der Linden, A.; Mantz, A. B.; Patil, S.; Reichardt, C. L.; Saro, A.; Sharon, K.; Stalder, B.; Stanford, S. A.; Stark, Antony A.; Strazzullo, V.
Abstract: We present spectroscopic confirmation of five galaxy clusters at 1.25 2 South Pole Telescope Sunyaev–Zel’dovich (SZ) survey. These clusters, taken from a mass-limited sample with a nearly redshift-independent selection function, have multiwavelength follow-up imaging data from the X-ray to near-IR and currently form the most homogeneous massive high-redshift cluster sample known. We identify 44 member galaxies, along with 25 field galaxies, among the five clusters, and describe the full set of observations and data products from Magellan/LDSS3 multiobject spectroscopy of these cluster fields. We briefly describe the analysis pipeline and present ensemble analyses of cluster member galaxies that demonstrate the reliability of the measured redshifts. We report z = 1.259, 1.288, 1.316, 1.401, and 1.474 for the five clusters from a combination of absorption-line (Ca II H&K doublet—λλ3968, 3934) and emission-line ([O II] λλ3727, 3729) spectral features. Moreover, the calculated velocity dispersions yield dynamical cluster masses in good agreement with the SZ masses for these clusters. We discuss the velocity and spatial distributions of passive and [O II]-emitting galaxies in these clusters, showing that they are consistent with velocity segregation and biases observed in lower redshift South Pole Telescope clusters. We identify modest [O II] emission and pronounced CN and Hδ absorption in a stacked spectrum of 28 passive galaxies with Ca II H&K-derived redshifts. This work increases the number of spectroscopically confirmed SZ-selected galaxy clusters at z > 1.25 from three to eight, further demonstrating the efficacy of SZ selection for the highest redshift massive clusters and enabling detailed study of these systems.
Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming GalaxiesMa, JingzheCooray, AsanthaNayyeri, HooshangBrown, AriannaGhotbi, NoahIvison, RobOteo, IvanDuivenvoorden, StevenGreenslade, JoshuaClements, DavidWardlow, JulieBattisti, Andrewda Cunha, ElisabeteAshby, Matthew L. N.Perez-Fournon, IsmaelRiechers, DominikOliver, SebEales, StephenNegrello, MattiaDye, SimonDunne, LorettaOmont, AlainScott, DouglasCox, PierreSerjeant, StephenMaddox, SteveValiante, ElisabettaDOI: info:10.3847/1538-4365/ab4194v. 24430
Ma, Jingzhe, Cooray, Asantha, Nayyeri, Hooshang, Brown, Arianna, Ghotbi, Noah, Ivison, Rob, Oteo, Ivan, Duivenvoorden, Steven, Greenslade, Joshua, Clements, David, Wardlow, Julie, Battisti, Andrew, da Cunha, Elisabete, Ashby, Matthew L. N., Perez-Fournon, Ismael, Riechers, Dominik, Oliver, Seb, Eales, Stephen, Negrello, Mattia, Dye, Simon, Dunne, Loretta, Omont, Alain, Scott, Douglas, Cox, Pierre, Serjeant, Stephen et al. 2019. "Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies." The Astrophysical Journal Supplement Series 244:30. https://doi.org/10.3847/1538-4365/ab4194
ID: 154638
Type: article
Authors: Ma, Jingzhe; Cooray, Asantha; Nayyeri, Hooshang; Brown, Arianna; Ghotbi, Noah; Ivison, Rob; Oteo, Ivan; Duivenvoorden, Steven; Greenslade, Joshua; Clements, David; Wardlow, Julie; Battisti, Andrew; da Cunha, Elisabete; Ashby, Matthew L. N.; Perez-Fournon, Ismael; Riechers, Dominik; Oliver, Seb; Eales, Stephen; Negrello, Mattia; Dye, Simon; Dunne, Loretta; Omont, Alain; Scott, Douglas; Cox, Pierre; Serjeant, Stephen; Maddox, Steve; Valiante, Elisabetta
Abstract: The largest Herschel extragalactic surveys, H-ATLAS and HerMES, have selected a sample of "ultrared" dusty star-forming galaxies (DSFGs) with rising SPIRE flux densities (S 500 > S 350 > S 250; the so-called "500 μm risers") as an efficient way for identifying DSFGs at higher redshift (z > 4). In this paper, we present a large Spitzer follow-up program of 300 Herschel ultrared DSFGs. We have obtained high-resolution Atacama Large Millimeter/submillimeter Array, Northern Extended Millimeter Array, and SMA data for 63 of them, which allow us to securely identify the Spitzer/IRAC counterparts and classify them as gravitationally lensed or unlensed. Within the 63 ultrared sources with high-resolution data, ̃65% appear to be unlensed and ̃27% are resolved into multiple components. We focus on analyzing the unlensed sample by directly performing multiwavelength spectral energy distribution modeling to derive their physical properties and compare with the more numerous z ̃ 2 DSFG population. The ultrared sample has a median redshift of 3.3, stellar mass of 3.7 × 1011 M , star formation rate (SFR) of 730 M yr-1, total dust luminosity of 9.0 × 1012 L , dust mass of 2.8 × 109 M , and V-band extinction of 4.0, which are all higher than those of the ALESS DSFGs. Based on the space density, SFR density, and stellar mass density estimates, we conclude that our ultrared sample cannot account for the majority of the star-forming progenitors of the massive, quiescent galaxies found in infrared surveys. Our sample contains the rarer, intrinsically most dusty, luminous, and massive galaxies in the early universe that will help us understand the physical drivers of extreme star formation.
The Star Formation Reference Survey - III. A multiwavelength view of star formation in nearby galaxiesMahajan, SmritiAshby, Matthew L. N.Willner, Steven P.Barmby, P.Fazio, Giovanni G.Maragkoudakis, A.Raychaudhury, S.Zezas, A.DOI: info:10.1093/mnras/sty2699v. 482560–577
Mahajan, Smriti, Ashby, Matthew L. N., Willner, Steven P., Barmby, P., Fazio, Giovanni G., Maragkoudakis, A., Raychaudhury, S., and Zezas, A. 2019. "The Star Formation Reference Survey - III. A multiwavelength view of star formation in nearby galaxies." Monthly Notices of the Royal Astronomical Society 482:560– 577. https://doi.org/10.1093/mnras/sty2699
ID: 150444
Type: article
Authors: Mahajan, Smriti; Ashby, Matthew L. N.; Willner, Steven P.; Barmby, P.; Fazio, Giovanni G.; Maragkoudakis, A.; Raychaudhury, S.; Zezas, A.
Abstract: We present multiwavelength global star formation rate (SFR) estimates for 326 galaxies from the Star Formation Reference Survey in order to determine the mutual scatter and range of validity of different indicators. The widely used empirical SFR recipes based on 1.4 GHz continuum, 8.0 μm polycyclic aromatic hydrocarbons (PAHs), and a combination of far-infrared (FIR) plus ultraviolet (UV) emission are mutually consistent with scatter of ≲0.3 dex. The scatter is even smaller, ≲0.24 dex, in the intermediate luminosity range 9.35 × 109 L or with implied far-UV extinction <1 mag, the UV spectral slope gives extinction corrections with 0.22 dex uncertainty.
A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3Shi, KeLee, Kyoung-SooDey, ArjunHuang, YunMalavasi, NicolaHung, Chao-LingInami, HanaeAshby, Matthew L. N.Duncan, KennethXue, RuiReddy, NaveenHong, SungryongJannuzi, Buell T.Cooper, Michael C.Gonzalez, Anthony H.Röttgering, Huub J. A.Best, Phillip N.Tasse, CyrilDOI: info:10.3847/1538-4357/aaf85dv. 87183
Shi, Ke, Lee, Kyoung-Soo, Dey, Arjun, Huang, Yun, Malavasi, Nicola, Hung, Chao-Ling, Inami, Hanae, Ashby, Matthew L. N., Duncan, Kenneth, Xue, Rui, Reddy, Naveen, Hong, Sungryong, Jannuzi, Buell T., Cooper, Michael C., Gonzalez, Anthony H., Röttgering, Huub J. A., Best, Phillip N., and Tasse, Cyril. 2019. "A Census of Galaxy Constituents in a Coma Progenitor Observed at z > 3." The Astrophysical Journal 871:83. https://doi.org/10.3847/1538-4357/aaf85d
ID: 150436
Type: article
Authors: Shi, Ke; Lee, Kyoung-Soo; Dey, Arjun; Huang, Yun; Malavasi, Nicola; Hung, Chao-Ling; Inami, Hanae; Ashby, Matthew L. N.; Duncan, Kenneth; Xue, Rui; Reddy, Naveen; Hong, Sungryong; Jannuzi, Buell T.; Cooper, Michael C.; Gonzalez, Anthony H.; Röttgering, Huub J. A.; Best, Phillip N.; Tasse, Cyril
Abstract: We present a detailed census of galaxies in and around PC 217.96+32.3, a spectroscopically confirmed Coma analog at z = 3.78. Diverse galaxy types identified in the field include Lyα emitters (LAEs), massive star-forming galaxies, and ultramassive galaxies (≳ {10}11 {M}ȯ ) which may have already halted their star formation. The sky distribution of the star-forming galaxies suggests the presence of a significant overdensity (δ SFG ≈ 8 ± 2), which is spatially offset from the previously confirmed members by 3–4 Mpc to the west. Candidate quiescent and post-starburst galaxies are also found in large excess (a factor of ∼8–15 higher surface density than the field’s), although their redshifts are less certain. We estimate that the total enclosed mass traced by the candidate star-forming galaxies is roughly comparable to that of PC 217.96+32.3 traced by the LAEs. We speculate that the true extent of PC 217.96+32.3 may be larger than previously known, half of which is missed by our LAE selection. Alternatively, the newly discovered overdensity may belong to another Coma progenitor not associated with PC 217.96+32.3. Expectations from theory suggest that both scenarios are equally unlikely ( ≈ 8 ± 2), which is spatially offset from the previously confirmed members by 3–4 Mpc to the west. Candidate quiescent and post-starburst galaxies are also found in large excess (a factor of ∼8–15 higher surface density than the field’s), although their redshifts are less certain. We estimate that the total enclosed mass traced by the candidate star-forming galaxies is roughly comparable to that of PC 217.96+32.3 traced by the LAEs. We speculate that the true extent of PC 217.96+32.3 may be larger than previously known, half of which is missed by our LAE selection. Alternatively, the newly discovered overdensity may belong to another Coma progenitor not associated with PC 217.96+32.3. Expectations from theory suggest that both scenarios are equally unlikely (* scaling relation as the field galaxies, suggesting that the environmental effect at z ∼ 4 is a subtle one at best for normal star-forming galaxies.
The Brightest z >~ 8 Galaxies over the COSMOS UltraVISTA FieldStefanon, MauroLabbé, IvoBouwens, Rychard J.Oesch, PascalAshby, Matthew L. N.Caputi, Karina I.Franx, MarijnFynbo, Johan P. U.Illingworth, Garth D.Le Fèvre, OlivierMarchesini, DaniloMcCracken, Henry J.Milvang-Jensen, BoMuzzin, Adamvan Dokkum, PieterDOI: info:10.3847/1538-4357/ab3792v. 88399
Stefanon, Mauro, Labbé, Ivo, Bouwens, Rychard J., Oesch, Pascal, Ashby, Matthew L. N., Caputi, Karina I., Franx, Marijn, Fynbo, Johan P. U., Illingworth, Garth D., Le Fèvre, Olivier, Marchesini, Danilo, McCracken, Henry J., Milvang-Jensen, Bo, Muzzin, Adam, and van Dokkum, Pieter. 2019. "The Brightest z >~ 8 Galaxies over the COSMOS UltraVISTA Field." The Astrophysical Journal 883:99. https://doi.org/10.3847/1538-4357/ab3792
ID: 154423
Type: article
Authors: Stefanon, Mauro; Labbé, Ivo; Bouwens, Rychard J.; Oesch, Pascal; Ashby, Matthew L. N.; Caputi, Karina I.; Franx, Marijn; Fynbo, Johan P. U.; Illingworth, Garth D.; Le Fèvre, Olivier; Marchesini, Danilo; McCracken, Henry J.; Milvang-Jensen, Bo; Muzzin, Adam; van Dokkum, Pieter
Abstract: We present 16 new ultrabright H AB ≲ 25 galaxy candidates at z ̃ 8 identified over the COSMOS/UltraVISTA field. The new search takes advantage of the deepest-available ground-based optical and near- infrared observations, including the DR3 release of UltraVISTA and full- depth Spitzer/IRAC observations from the SMUVS and SPLASH programs. Candidates are selected using Lyman-break color criteria, combined with strict optical non-detection and SED-fitting criteria, designed to minimize contamination by low-redshift galaxies and low-mass stars. HST/WFC3 coverage from the DASH program reveals that one source evident in our ground-based near-IR data has significant substructure and may actually correspond to 3 separate z ̃ 8 objects, resulting in a total sample of 18 galaxies, 10 of which seem to be fairly robust (with a >97% probability of being at z > 7). The UV-continuum slope β for the bright z ̃ 8 sample is β = -2.2 ± 0.6, bluer but still consistent with that of similarly bright galaxies at z ̃ 6 (β = -1.55 ± 0.17) and z ̃ 7 (β = -1.75 ± 0.18). Their typical stellar masses are {10}{9.1-0.4+0.5} M , with the SFRs of {32}-32+44{M} yr-1, specific SFR of {4}-4+8 Gyr-1, stellar ages of ̃ {22}-22+69 Myr, and low dust content {A}V={0.15}-0.15+0.30 mag. Using this sample we constrain the bright end of the z ̃ 8 UV luminosity function. When combined with recent empty field luminosity function estimates at similar redshifts, the resulting z ̃ 8 luminosity function can be equally well represented by either a Schechter or a double-power-law form. Assuming a Schechter parameterization, the best-fit characteristic magnitude is {M}* =-{20.95}-0.35+0.30 mag with a very steep faint-end slope α =-{2.15}-0.19+0.20. These new candidates include some of the brightest objects found at these redshifts, 0.5-1.0 magnitude brighter than those found over CANDELS, and providing excellent targets for spectroscopic and longer-wavelength follow-up studies.
Galaxy populations in the most distant SPT-SZ clusters. I. Environmental quenching in massive clusters at 1.4 ≲ z ≲ 1.7Strazzullo, V.Pannella, M.Mohr, J. J.Saro, A.Ashby, Matthew L. N.Bayliss, M. B.Bocquet, S.Bulbul, EsraKhullar, G.Mantz, A. B.Stanford, S. A.Benson, B. A.Bleem, L. E.Brodwin, M.Canning, R. E. A.Capasso, R.Chiu, I.Gonzalez, A. H.Gupta, N.Hlavacek-Larrondo, J.Klein, M.McDonald, M.Noordeh, E.Rapetti, D.Reichardt, C. L.Schrabback, T.Sharon, K.Stalder, B.DOI: info:10.1051/0004-6361/201833944v. 622A117
Strazzullo, V., Pannella, M., Mohr, J. J., Saro, A., Ashby, Matthew L. N., Bayliss, M. B., Bocquet, S., Bulbul, Esra, Khullar, G., Mantz, A. B., Stanford, S. A., Benson, B. A., Bleem, L. E., Brodwin, M., Canning, R. E. A., Capasso, R., Chiu, I., Gonzalez, A. H., Gupta, N., Hlavacek-Larrondo, J., Klein, M., McDonald, M., Noordeh, E., Rapetti, D., Reichardt, C. L. et al. 2019. "Galaxy populations in the most distant SPT-SZ clusters. I. Environmental quenching in massive clusters at 1.4 ≲ z ≲ 1.7." Astronomy and Astrophysics 622:A117. https://doi.org/10.1051/0004-6361/201833944
ID: 150531
Type: article
Authors: Strazzullo, V.; Pannella, M.; Mohr, J. J.; Saro, A.; Ashby, Matthew L. N.; Bayliss, M. B.; Bocquet, S.; Bulbul, Esra; Khullar, G.; Mantz, A. B.; Stanford, S. A.; Benson, B. A.; Bleem, L. E.; Brodwin, M.; Canning, R. E. A.; Capasso, R.; Chiu, I.; Gonzalez, A. H.; Gupta, N.; Hlavacek-Larrondo, J.; Klein, M.; McDonald, M.; Noordeh, E.; Rapetti, D.; Reichardt, C. L.; Schrabback, T.; Sharon, K.; Stalder, B.
Abstract: We present the first results from a galaxy population study in the highest redshift galaxy clusters identified in the 2500 deg2 South Pole Telescope Sunyaev Zel'dovich effect (SPT-SZ) survey, which is sensitive to M500 ≳ 3 × 1014 M clusters from z ˜ 0.2 out to the highest redshifts where such massive structures exist. The cluster selection is to first order independent of galaxy properties, making the SPT-SZ sample particularly well suited for cluster galaxy population studies. We carried out a four-band imaging campaign with the Hubble and Spitzer Space Telescopes of the five z ≳ 1.4, S/NSZE > 5 clusters, that are among the rarest most massive clusters known at this redshift. All five clusters show clear overdensities of red galaxies whose colors agree with the initial cluster redshift estimates, although one (SPT-CLJ0607-4448) shows a galaxy concentration much less prominent than the others. The highest redshift cluster in this sample, SPT-CLJ0459-4947 at z ˜ 1.72, is the most distant M500 > 1014 M cluster discovered thus far through its intracluster medium, and is one of only three known clusters in this mass range at z ≳ 1.7, regardless of selection. Based on UVJ-like photometric classification of quiescent and star-forming galaxies, we find that the quiescent fraction in the cluster central regions (r/r500 ) > 10.85. We have explored the impact of emission from star formation on the selection of this sample, concluding that all five clusters studied here would still have been detected with S/NSZE> 5, even if they had the same quiescent fraction as measured in the field. Our results thus point towards an efficient suppression of star formation in the central regions of the most massive clusters, occurring already earlier than z ˜ 1.5.
Deep ugrizY imaging and DEEP2/3 spectroscopy: a photometric redshift testbed for LSST and public release of data from the DEEP3 Galaxy Redshift SurveyZhou, RongpuCooper, Michael C.Newman, Jeffrey A.Ashby, Matthew L. N.Aird, JamesConselice, Christopher J.Davis, MarcDutton, Aaron A.Faber, S. M.Fang, Jerome J.Fazio, Giovanni G.Guhathakurta, PuragraKocevski, DaleKoo, David C.Nandra, KirpalPhillips, Andrew C.Rosario, David J.Schlafly, Edward F.Trump, Jonathan R.Weiner, BenjaminWillmer, Christopher N. A.Yan, RenbinDOI: info:10.1093/mnras/stz1866v. 4884565–4584
Zhou, Rongpu, Cooper, Michael C., Newman, Jeffrey A., Ashby, Matthew L. N., Aird, James, Conselice, Christopher J., Davis, Marc, Dutton, Aaron A., Faber, S. M., Fang, Jerome J., Fazio, Giovanni G., Guhathakurta, Puragra, Kocevski, Dale, Koo, David C., Nandra, Kirpal, Phillips, Andrew C., Rosario, David J., Schlafly, Edward F., Trump, Jonathan R., Weiner, Benjamin, Willmer, Christopher N. A., and Yan, Renbin. 2019. "Deep ugrizY imaging and DEEP2/3 spectroscopy: a photometric redshift testbed for LSST and public release of data from the DEEP3 Galaxy Redshift Survey." Monthly Notices of the Royal Astronomical Society 488:4565– 4584. https://doi.org/10.1093/mnras/stz1866
ID: 154696
Type: article
Authors: Zhou, Rongpu; Cooper, Michael C.; Newman, Jeffrey A.; Ashby, Matthew L. N.; Aird, James; Conselice, Christopher J.; Davis, Marc; Dutton, Aaron A.; Faber, S. M.; Fang, Jerome J.; Fazio, Giovanni G.; Guhathakurta, Puragra; Kocevski, Dale; Koo, David C.; Nandra, Kirpal; Phillips, Andrew C.; Rosario, David J.; Schlafly, Edward F.; Trump, Jonathan R.; Weiner, Benjamin; Willmer, Christopher N. A.; Yan, Renbin
Abstract: We present catalogues of calibrated photometry and spectroscopic redshifts in the Extended Groth Strip, intended for studies of photometric redshifts (photo-z's). The data includes ugriz photometry from Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) and Y-band photometry from the Subaru Suprime camera, as well as spectroscopic redshifts from the DEEP2, DEEP3, and 3D-HST surveys. These catalogues incorporate corrections to produce effectively matched-aperture photometry across all bands, based upon object size information available in the catalogue and Moffat profile point spread function fits. We test this catalogue with a simple machine learning-based photometric redshift algorithm based upon Random Forest regression, and find that the corrected aperture photometry leads to significant improvement in photo-z accuracy compared to the original SEXTRACTOR catalogues from CFHTLS and Subaru. The deep ugrizY photometry and spectroscopic redshifts are well suited for empirical tests of photometric redshift algorithms for LSST. The resulting catalogues are publicly available at http://d-scholarship.pitt.edu/36064/. We include a basic summary of the strategy of the DEEP3 Galaxy Redshift Survey to accompany the recent public release of DEEP3 data.
Spitzer Matching Survey of the UltraVISTA Ultra-deep Stripes (SMUVS): Full-mission IRAC Mosaics and CatalogsAshby, M. L. N.Caputi, Karina I.Cowley, WillDeshmukh, SmaranDunlop, James S.Milvang-Jensen, BoFynbo, Johan P. U.Muzzin, AdamMcCracken, H. J.Le Fèvre, OlivierHuang, Jia-ShengZhang, J.DOI: info:10.3847/1538-4365/aad4fbv. 23739
Ashby, M. L. N., Caputi, Karina I., Cowley, Will, Deshmukh, Smaran, Dunlop, James S., Milvang-Jensen, Bo, Fynbo, Johan P. U., Muzzin, Adam, McCracken, H. J., Le Fèvre, Olivier, Huang, Jia-Sheng, and Zhang, J. 2018. "Spitzer Matching Survey of the UltraVISTA Ultra-deep Stripes (SMUVS): Full-mission IRAC Mosaics and Catalogs." The Astrophysical Journal Supplement Series 237:39. https://doi.org/10.3847/1538-4365/aad4fb
ID: 148979
Type: article
Authors: Ashby, M. L. N.; Caputi, Karina I.; Cowley, Will; Deshmukh, Smaran; Dunlop, James S.; Milvang-Jensen, Bo; Fynbo, Johan P. U.; Muzzin, Adam; McCracken, H. J.; Le Fèvre, Olivier; Huang, Jia-Sheng; Zhang, J.
Abstract: This paper describes new deep 3.6 and 4.5 mum imaging of three UltraVISTA near-infrared survey stripes within the COSMOS field. The observations were carried out with Spitzer's Infrared Array Camera (IRAC) for the Spitzer Matching Survey of the UltraVISTA Deep Stripes (SMUVS). In this work we present our data reduction techniques, and document the resulting mosaics, coverage maps, and catalogs in both IRAC passbands for the three easternmost UltraVISTA survey stripes, covering a combined area of about 0.66 deg2, of which 0.45 deg2 have at least 20 hr of integration time. SMUVS reaches point-source sensitivities of about 25.0 AB mag (0.13 muJy) at both 3.6 and 4.5 mum, with a significance of 4sigma, accounting for both survey sensitivity and source confusion. To this limit the SMUVS catalogs contain a total of ~350,000 sources, each of which is detected significantly in at least one IRAC band. Because of its uniform and high sensitivity, relatively large area coverage, and the wide array of ancillary data available in COSMOS, the SMUVS survey will be useful for a large number of cosmological investigations. We make all images and catalogs described herein publicly available via the Spitzer Science Center.