Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.383w&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
The ultimate goal of the theoretical modeling of prestellar and protostellar objects is to obtain synthetic line profiles that could be directly compared to spectroscopic observations. To achieve this goal, one needs to know distributions of temperature, density, velocity, radiation field, and chemical abundances in a studied object. Only when all these data are available, we can reliably distinguish a truly starless core from a core that already harbors an inner heating source. In this contribution we show how the presence of an embedded protostar that is not yet seen in the MIR continuum alters the appearance of an IRDC core on maps of molecular emission. In Figure we show HCO^+ (3--2) spectral maps for a hypothetical core for the cases with and without an inner source. When the angular resolution is limited only by the grid size, two cases definitely differ from each other, with a very bright emission spot in the direction of the protostar. However, when the image is convolved with the 10%B rime%B rime Gaussian beam, all the differences are smeared out (distance of 2 kpc is assumed). This shows that the classification of the core as starless based on the simplified treatment of visual inspection can be incorrect. Such inferences, thus, require observations with high angular resolution.
Pavlyuchenkov Yaroslav
Wiebe Dmitry
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