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 (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.
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Data Availability
The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request. The raw ALMA data are publicly available at https://almascience.nao.ac.jp/asax/ (project id: 2019.1.00768.S).
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Acknowledgements
We thank the anonymous referee for the helpful comments that improved the manuscript. A.M. acknowledges the Swami Vivekananda Merit-cum-Means Scholarship (SVMCM) for financial support for this research. This paper makes use of the following ALMA data: ADS /JAO.ALMA#2019.1.00768.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in co-operation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ.
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S.P. conceptualize the project. A.M. analysed the ALMA data and identify the emission lines of cyanamide (NH2CN) from G358.93–0.03 MM1. A.M. analyses the rotational diagram to derive the column density and rotational temperature of NH2CN. A.M. and S.P. wrote the main manuscript text. All authors reviewed the manuscript.
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Manna, A., Pal, S. Identification of interstellar cyanamide towards the hot molecular core G358.93–0.03 MM1. Astrophys Space Sci 368, 33 (2023). https://doi.org/10.1007/s10509-023-04192-4
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DOI: https://doi.org/10.1007/s10509-023-04192-4