Thiel, V., Belloche, A., Menten, K. M., Garrod, T. and Muller, H. S. P. (2017). Complex organic molecules in diffuse clouds along the line of sight to Sagittarius B2. Astron. Astrophys., 605. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Up to now, mostly relatively simple molecules have been detected in interstellar diffuse molecular clouds in our galaxy, but more complex species have been reported in the diffuse/translucent medium of a z = 0 : 89 spiral galaxy. Aims. We aim at searching for complex organic molecules (COMs) in diffuse molecular clouds along the line of sight to Sgr B2(N), taking advantage of the high sensitivity and angular resolution of the Atacama Large Millimeter/submillimeter Array (ALMA). Methods. We use data acquired as part of the EMoCA survey performed with ALMA. To analyse the absorption features of the molecules detected towards the ultracompact H II region K4 in Sgr B2(N), we calculate synthetic spectra for these molecules and fit their column densities, line widths, centroid velocities, and excitation temperatures. Results. We report the detection of CH3OH, CH3CN, CH3CHO, HC3N, and NH2CHO in Galactic center (GC) diffuse clouds and CH3OH and CH3CN in a diffuse cloud in the Scutum arm. The chemical composition of one of the diffuse GC clouds is found to be similar to the one of the diffuse/translucent medium of the z = 0 : 89 spiral galaxy. Conclusions. The chemical processes leading to chemical complexity in the diffuse molecular ISM appear to have remained similar since z = 0.89. As proposed in previous studies, the presence of COMs in diffuse molecular clouds may result from a cyclical interstellar process of cloud contraction and expansion between diffuse and dense states.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Thiel, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Belloche, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garrod, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muller, H. S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-220611
DOI: 10.1051/0004-6361/201731495
Journal or Publication Title: Astron. Astrophys.
Volume: 605
Date: 2017
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
CHEMICAL COMPLEXITY; CHEMISTRY; PHYSICS; MILLIMETER; GRADIENT; REGION; DENSE; GASMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/22061

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