H13CN-HN13C Intensity Ratio As A Temperature Indicator Of Interstellar Clouds

By Keith Cowing
Press Release
December 6, 2022
Filed under , ,
H13CN-HN13C Intensity Ratio As A Temperature Indicator Of Interstellar Clouds
Maps for NGC 7538 (upper panels) and DR 21(OH) (lower panels). The integrated intensity ratio of the molecules H13CN and HN13C (a); Tkin(H13CN/HN13C) (b), the kinetic temperature derived using CH3CCH transitions (c) and the kinetic temperature derived using NH3 transitions (d). The SCUBA 850 µm continuum data [22] are indicated by contours. The star-shaped marker indicates the IRAS 23116+6111 position. — astro-ph.GA

With the 30-m IRAM radio telescope, we observed several massive star forming regions at wavelengths of 3-4 and 2 mm.

The temperature of the gas in the sources was estimated from the lines of CH3CCH and from the transitions of the NH3 molecule obtained during observations at the 100-m radio telescope in Effelsberg. As a result, a correlation between the integrated intensity ratios of the J=1−0 transitions of H13CN and HN13C and the kinetic temperature has been obtained.

The obtained results allow us to propose the use of the intensity ratio H13CN-HN13C as a possible temperature indicator of interstellar clouds. We also compared the obtained estimates of the kinetic temperature with the dust temperature Tdust. As a result, no significant correlation was found.

A. G. Pazukhin, I. I. Zinchenko, E. A. Trofimova, C. Henkel

Comments: 16 pages, 7 figures, 2 tables, Accepted for publication in Astronomy Reports (2022)
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2211.14063 [astro-ph.GA] (or arXiv:2211.14063v1 [astro-ph.GA] for this version)
Submission history
From: Andrey Pazukhin
[v1] Fri, 25 Nov 2022 12:38:17 UTC (795 KB)
Astrobiology, Astrochemistry

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