H${}^{13}$CN-HN${}^{13}$C intensity ratio as a temperature indicator of interstellar clouds

Abstract

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 CH${}_3$CCH and from the transitions of the NH${}_3$ 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 H${}^{13}$CN and HN${}^{13}$C and the kinetic temperature has been obtained. The obtained results allow us to propose the use of the intensity ratio H${}^{13}$CN-HN${}^{13}$C as a possible temperature indicator of interstellar clouds. We also compared the obtained estimates of the kinetic temperature with the dust temperature $T_{dust}$. As a result, no significant correlation was found.

arXiv comment16 pages, 7 figures, 2 tables, Accepted for publication in Astronomy Reports (2022)

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Cited by in corpus (4)

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• H2CN/H2NC abundance ratio: a new potential temperature tracer for the interstellar medium
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