Exploring the formation pathways of formamide near young O-type stars

Abstract

Context. As a building block for amino acids, formamide (NH${}_2$CHO) 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 H${}_2$CO. Methods. We examine high angular resolution (~0.2") Atacama Large Millimeter/submillimeter Array (ALMA) 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 H${}_2$CO line emission with that of NH${}_2$CHO 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 H${}_2$CO 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 NH${}_2$CHO and HNCO reproduces the previously demonstrated abundance relationship. Conclusions. In this first interferometric study, which compares two potential parent species to NH${}_2$CHO, we find that all moment maps for HNCO are more similar to NH${}_2$CHO than H${}_2$CO in one of our six sources (G24 A1). For the other five sources, the relationship between NH${}_2$CHO, HNCO, and H${}_2$CO is unclear as the different moment maps for each source are not consistently more similar to one species as opposed to the other.

arXiv commentMain text: 15 pages, 17 figures, 10 tables. Appendix: 21 pages, 28 figures

References in corpus (23)

• A computer program for fast non-LTE analysis of interstellar line spectra
• The Cologne Database for Molecular Spectroscopy, CDMS, in the Virtual Atomic and Molecular Data Centre, VAMDC
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• Testing grain-surface chemistry in massive hot-core regions
• The Red MSX Source Survey: the Massive Young Stellar Population of our Galaxy
• Gas phase formation of the prebiotic molecule formamide: insights from new quantum computations
• Shedding light on the formation of the pre-biotic molecule formamide with ASAI
• The ALMA-PILS survey: First detections of deuterated formamide and deuterated isocyanic acid in the interstellar medium
• Seeds of Life in Space (SOLIS) III. Formamide in protostellar shocks: evidence for gas-phase formation
• eXtended CASA Line Analysis Software Suite (XCLASS)
• New quantum chemical computations of formamide deuteration support a gas-phase formation of this prebiotic molecule
• Molecules with a peptide link in protostellar shocks: a comprehensive study of L1157
• Chemical modelling of complex organic molecules with peptide-like bonds in star-forming regions
• Simultaneous Hydrogenation and UV-photolysis Experiments of NO in CO-rich Interstellar Ice Analogues; linking HNCO, OCN-, NH2CHO and NH2OH
• Interstellar formamide (NH${}_2$CHO), a key prebiotic precursor
• A necklace of dense cores in the high-mass star forming region G35.20-0.74N: ALMA observations
• STATCONT: A statistical continuum level determination method for line-rich sources
• Hydrogenation at low temperatures does not always lead to saturation: the case of HNCO
• Chasing discs around O-type (proto)stars - ALMA evidence for an SiO disc and disc wind from G17.64+0.16
• Chemical Segregation in Hot Cores With Disk Candidates: An investigation with ALMA
• Thermal and energetic processing of astrophysical ice analogues rich in SO${}_2$
• The hyperyoung HII region in G24.78+0.08 A1
• A Protostellar Jet Emanating from a Hypercompact HII Region

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• The GUAPOS project II. A comprehensive study of peptide-like bond molecules
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• Interrelations between Astrochemistry and Galactic Dynamics
• Sub-arcsecond Imaging of the Complex Organic Chemistry in Massive Star-forming Region G10.6-0.4
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