Universität zu Köln

Allen, V., van der Tak, F. F. S., Lopez-Sepulcre, A., Sanchez-Monge, A., Rivilla, V. M. and Cesaroni, R. (2020). Exploring the formation pathways of formamide Near young O-type stars. Astron. Astrophys., 636. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. As a building block for amino acids, formamide (NH2CHO) is an important molecule in astrobiology and astrochemistry, but its formation path in the interstellar medium is not understood well. Aims. We aim to find empirical evidence to support the chemical relationships of formamide to HNCO and H2CO. Methods. We examine high angular resolution (0.2 '') Atacama Large Millimeter/submillimeter Array maps of six sources in three high-mass star-forming regions and compare the spatial extent, integrated emission peak position, and velocity structure of HNCO and H2CO line emission with that of NH2CHO by using moment maps. Through spectral modeling, we compare the abundances of these three species. Results. In these sources, the emission peak separation and velocity dispersion of formamide emission is most often similar to HNCO emission, while the velocity structure is generally just as similar to H2CO and HNCO (within errors). From the spectral modeling, we see that the abundances between all three of our focus species are correlated, and the relationship between NH2CHO and HNCO reproduces the previously demonstrated abundance relationship. Conclusions. In this first interferometric study, which compares two potential parent species to NH2CHO, we find that all moment maps for HNCO are more similar to NH2CHO than H2CO in one of our six sources (G24 A1). For the other five sources, the relationship between NH2CHO, HNCO, and H2CO is unclear as the different moment maps for each source are not consistently more similar to one species as opposed to the other.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Allen, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Tak, F. F. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lopez-Sepulcre, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rivilla, V. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cesaroni, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-336717
DOI:	10.1051/0004-6361/201935791
Journal or Publication Title:	Astron. Astrophys.
Volume:	636
Date:	2020
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:	Keywords Language GAS-PHASE FORMATION; MOLECULE FORMAMIDE; INTERSTELLAR; SPECTRA; NH2CHO Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33671