From clouds to protoplanetary disks: the astrochemical link

4-8 October 2015
Hans Harnack Haus
Europe/Berlin timezone
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Poster session

Deuterium fractionation of IRDC cores

Speakers

• Mr. Vlas SOKOLOV

Content

Infrared dark clouds (IRDCs), dense and dark silhouettes against bright Galactic background, are thought to be the cradles of massive star and cluster formation, being cold, dense, and massive enough to harbour massive protostars. Previous studies show great diversity of IRDCs, ranging from dense quiescent clouds on the verge of star formation to relatively evolved regions with embedded massive protostars driving outflows and forming H$_{\mathrm{II}}$ regions. Determining reliable tracers of IRDC evolution will help establish a coherent picture of IRDC diversity and their evolutionary sequence. In particular, the trend in deuterium fractionation vs. temperature, luminosity, and line width may be an indicator of embedded protostar evolution. In this study, we derive dust temperature and column density maps of 9 IRDCs derived from publicly available Herschel far ­infrared data. We present dust temperatures and luminosities for 44 IRDC cores. Our results suggest a general behaviour of deuterated species in high ­mass protostellar cores in relation to their evolutionary tracers, in particular the use of $\mathrm{R_D~(N_2H^+)}$ as a chemical clock for high ­mass protostellar objects.