Interstellar Glycolaldehyde, Methyl Formate, and Acetic Acid. I. A Bimodal Abundance Pattern in Star-forming Regions

Interstellar Glycolaldehyde, Methyl Formate, and Acetic Acid. I. A Bimodal Abundance Pattern in Star-forming RegionsEl-Abd, Samer J.Brogan, Crystal L.Hunter, Todd R.Willis, Eric R.Garrod, Robin T.McGuire, Brett A.DOI: info:10.3847/1538-4357/ab3646v. 883129
El-Abd, Samer J., Brogan, Crystal L., Hunter, Todd R., Willis, Eric R., Garrod, Robin T., and McGuire, Brett A. 2019. "Interstellar Glycolaldehyde, Methyl Formate, and Acetic Acid. I. A Bimodal Abundance Pattern in Star-forming Regions." The Astrophysical Journal 883:129. https://doi.org/10.3847/1538-4357/ab3646
ID: 154698
Type: article
Authors: El-Abd, Samer J.; Brogan, Crystal L.; Hunter, Todd R.; Willis, Eric R.; Garrod, Robin T.; McGuire, Brett A.
Abstract: The relative column densities of the structural isomers methyl formate, glycolaldehyde, and acetic acid are derived for a dozen positions toward the massive star-forming regions MM1 and MM2 in the NGC 6334I complex, which are separated by ̃4000 au. Relative column densities of these molecules are also gathered from the literature for 13 other star-forming regions. In this combined data set, a clear bimodal distribution is observed in the relative column densities of glycolaldehyde and methyl formate. No such distribution is evident with acetic acid. The two trends are comprised of star-forming regions with a variety of masses, suggesting that there must be some other common parameter that is heavily impacting the formation of glycolaldehyde. This is indicative of some demonstrable differentiation in these cores; studying the abundances of these isomers may provide a clue as to the integral chemical processes ongoing in a variety of protostellar environments.