Identification of interstellar cyanamide towards the hot molecular core G358.93-0.03 MM1

Abstract

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 (NH${}_2$CN) towards the hot molecular core G358.93$-$0.03 MM1 using the Atacama Large Millimeter/Submillimeter Array (ALMA). Using the rotational diagram model, the derived column density of NH${}_2$CN towards the G358.93$-$0.03 MM1 was (5.9$\pm$2.5)$\times$10${}^{14}$ cm${}^{-2}$ with a rotational temperature of 100.6$\pm$30.4 K. The derived fractional abundance of NH${}_2$CN towards the G358.93$-$0.03 MM1 with respect to H${}_2$ was (4.72$\pm$2.0)$\times$10${}^{-10}$, which is very similar to the existent three-phase warm-up chemical model abundances of NH${}_2$CN. We compare the estimated abundance of NH${}_2$CN towards G358.93$-$0.03 MM1 with other sources, and we observe the abundance of NH${}_2$CN towards G358.93$-$0.03 MM1 is nearly similar to that of the sculptor galaxy NGC 253 and the low-mass protostars IRAS 16293-2422 B and NGC 1333 IRAS4A2. We also discussed the possible formation mechanisms of NH${}_2$CN towards the hot molecular cores and hot corinos, and we find that the NH${}_2$CN molecule was created in the grain-surfaces of G358.93-0.03 MM1 via the neutral-neutral reaction between NH${}_2$ and CN.

Published in Astrophysics and Space Science

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• First detection of ethylene oxide and acetaldehyde in hot core G358.93$-$0.03 MM1: Tracing prebiotic oxygen chemistry
• Tentative Detection of the Glycine Isomer Glycolamide in Hot Molecular Core
• Organic Acid Chemistry in ISM: Detection of Formic Acid and its Prebiotic Chemistry in Hot Core G358.93$-$0.03 MM1
• Digging into the Massive Protostar S255IR NIRS3: A Study of Nitrogen-Bearing Molecules and Their Prebiotic Chemistry