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H$^{13}$CN-HN$^{13}$C intensity ratio as a temperature indicator of interstellar clouds
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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.
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Study of the physical and chemical properties of dense clumps at different evolutionary stages in several regions of massive star and stellar cluster formation
A survey of 20 dense clumps in five massive star-forming regions finds a strong mass-size correlation, weak dynamical correlations, and hints that magnetic fields around 1 mG help stabilize the most massive clumps.
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