期刊
ASTRONOMY & ASTROPHYSICS
卷 439, 期 2, 页码 613-625出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20042379
关键词
ISM : clouds; ISM : dust, extinction; ISM : structure; stars : formation; submillimeter
This paper presents results from modelling 450 mu m and 850 mu m continuum and HCO+ line observations of three distinct cores of an infrared dark cloud (IRDC) directed toward the W51 GMC. In the sub-mm continuum these cores appear as bright, isolated emission features. One of them coincides with the peak of 8.3 mu m extinction as measured by the Midcourse Space Experiment satellite. Detailed radiative transfer codes are applied to constrain the cores' physical conditions to address the key question: Do these IRDC-cores harbour luminous sources? The results of the continuum model, expressed in the chi(2) quality-of-fit parameter, are also constrained by the absence of 100 mu m emission from IRAS. For the sub-mm emission peaks this shows that sources of similar to 300 L-circle dot are embedded within the cores. For the extinction peak, the combination of continuum and HCO+ line modelling indicates that a heating source is present as well. Furthermore, the line model provides constraints on the clumpiness of the medium. All three cores have similar masses of about 70-150 M-circle dot and similar density structures. The extinction peak differs from the other two cores by hosting a much weaker heating source, and the sub-mm emission core at the edge of the IRDC deviates from the other cores by a higher internal clumpiness.
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