I. Zinchenko, A. G. Pazukhin, E. Trofimova, P. Zemlyanukha, C. Henkel, Magnus Thomasson Institute of Applied Physics of the Russ Sciences, Lobachevsky State University of Nizhni Novgorod, Russia., Max Planck Institut fur Radioastronomie, H Germany, Astron. Dept., Faculty of Computer Science, King Abdulaziz University, Jeddah, S. Arabia, C. U. Technology, O. Observatory, Sweden.
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Deuterated molecules in regions of high-mass star formation
We present the results of our studies of deuterated molecules (DCN, DNC, DCO$^+$, N$_2$D$^+$ and NH$_2$D) in regions of high-mass star formation, which include a survey of such regions with the 20-m Onsala radio telescope and mapping of several objects in various lines with the 30-m IRAM and 100-m MPIfR radio telescopes. The deuteration degree reaches $\sim$10$^{-2}$ in these objects. We discuss its dependencies on the gas temperature and velocity dispersion, as well as spatial distributions of deuterated molecules. We show that the H$^{13}$CN/HN$^{13}$C intensity ratio may be a good indicator of the gas kinetic temperature and estimate densities of the investigated objects.
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