Astrochemistry

Identification Of Interstellar Cyanamide Towards The Hot Molecular Core G358.93-0.03 MM1

By Keith Cowing

Status Report

astro-ph.GA

July 8, 2023

Filed under ALMA, astro-ph.GA, astrochemistry, biochemistry, G358.93−0.03 MM., interstellar medium, organic chemistry, prebiotic chemistry

Identification Of Interstellar Cyanamide Towards The Hot Molecular Core G358.93-0.03 MM1 — Integrated emission maps of NH2CN towards the G358.93–0.03 MM1. The emission maps were overlaid with the 1.37 mm continuum emission map (red contour). The contour levels are at 20%, 40%, 60%, 80%, and 100% of the continuum peak flux. The green circle indicated the synthesised beam of the integrated emission maps. — astro-ph.GA

The amide-related molecules are essential for the formation of the other complex bio-molecules and an understanding of the prebiotic chemistry in the interstellar medium (ISM).

We presented the first detection of the rotational emission lines of the amide-like molecule cyanamide (NH2CN) towards the hot molecular core G358.93−0.03 MM1 using the Atacama Large Millimeter/Submillimeter Array (ALMA). Using the rotational diagram model, the derived column density of NH2CN towards the G358.93−0.03 MM1 was (5.9±2.5)×1014 cm−2 with a rotational temperature of 100.6±30.4 K. The derived fractional abundance of NH2CN towards the G358.93−0.03 MM1 with respect to H2 was (4.72±2.0)×10−10, which is very similar to the existent three-phase warm-up chemical model abundances of NH2CN.

We compare the estimated abundance of NH2CN towards G358.93−0.03 MM1 with other sources, and we observe the abundance of NH2CN towards G358.93−0.03 MM1 is nearly similar to that of the sculptor galaxy NGC 253 and the low-mass protostars IRAS 16293-2422 B and NGC 1333 IRAS4A2. We also discussed the possible formation mechanisms of NH2CN towards the hot molecular cores and hot corinos, and we find that the NH2CN molecule was created in the grain-surfaces of G358.93-0.03 MM1 via the neutral-neutral reaction between NH2 and CN.

Arijit Mannna, Sabyasachi Pal

Comments: Published in Astrophysics and Space Science
Subjects: Astrophysics of Galaxies (astro-ph.GA); Chemical Physics (physics.chem-ph)
Cite as: arXiv:2305.05578 [astro-ph.GA] (or arXiv:2305.05578v1 [astro-ph.GA] for this version)
Journal reference: Astrophysics and Space Science, 2023, volume 368, page 33
Related DOI:
https://doi.org/10.1007/s10509-023-04192-4
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Submission history
From: Sabyasachi Pal Dr.
[v1] Fri, 21 Apr 2023 15:43:58 UTC (1,199 KB)
https://arxiv.org/abs/2305.05578
Astrobiology, Astrochemistry

Keith Cowing

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻

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