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

A. G. Pazukhin, I. I. Zinchenko, E. A. Trofimova +1

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 th…