Astronomical triplets: ALMA observations of C2H4O2 isomers in Sgr B2 (N)

Xue, Ci

Permalink

https://hdl.handle.net/2142/97017 Copy

Description

Title

Astronomical triplets: ALMA observations of C2H4O2 isomers in Sgr B2 (N)

Author(s)

Xue, Ci

Contributor(s)

• Herbst, Eric
• Burkhardt, Andrew M.
• Remijan, Anthony

Issue Date

2017-06-19

Keyword(s)

Atacama Large Millimeter/submillimeter Array (ALMA)'s molecular view

Abstract

The $mathrm{C_2H_4O_2}$ triplet found in the interstellar medium (ISM) consists of glycolaldehyde ($mathrm{CH_2OHCHO}$), acetic acid ($mathrm{CH_3COOH}$) and methyl formate ($mathrm{HCOOCH_3}$). The forming mechanism of their $mathrm{HCO}$-bearing component involves both gas-phase and grain-surface processes whose relative roles plays into fundamental questions within the fields of astrochemistry and astrobiology. Glycolaldehyde is closely related to ribose and deoxyribose, the primary components of genetic materials. The first detection of Glycolaldehyde was toward Sgr B2 with using NRAO 12 m telescope in 2000 (J. M. Hollis et al). A new careful search for glycolaldehyde toward the hot dense core Sgr B2 (N) is needed. While methyl formate has a large number of detected transitions throughout the ISM, the detection of acetic acid, the least abundant of these isomers, is more tentative. Mehringer et al. (1997) reported only 4 lines of acetic acid toward Sgr B2 Large Molecule Heimat source. Here, we confirm these detections of each species toward Sgr B2 (N) with the more sensitive and larger bandwidth from ALMA Band 3 observations (A. Belloche, 2012), providing us more transitions and more accurate continuum subtraction. Based on these results, the abundances and spatial distributions of the $mathrm{C_2H_4O_2}$ triplet species would be obtained and compared.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/97017

DOI

https://doi.org/10.15278/isms.2017.MF08

Copyright and License Information

Copyright 2017 Ci Xue

Owning Collections