Density profiles in molecular cloud cores associated with high-mass star-forming regions |
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| Authors: | L E Pirogov |
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| Institution: | 1.Institute of Applied Physics,RAS,Moscow,Russia |
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| Abstract: | Radial density profiles for the sample of dense cores associated with high-mass star-forming regions from southern hemisphere
have been derived using the data of observations in continuum at 250 GHz. Radial density profiles for the inner regions of
16 cores (at distances ≲0.2−0.8 pc from the center) are close on average to the ρ ∝ r
−α dependence, where α = 1.6 ± 0.3. In the outer regions density drops steeper. An analysis with various hydrostatic models showed that the modified
Bonnor-Ebertmodel, which describes turbulent sphere confined by external pressure, is preferable compared with the logotrope
and polytrope models practically in all cases. With a help of the Bonnor-Ebert model, estimates of central density in a core,
non-thermal velocity dispersion and core size are obtained. The comparison of central densities with the densities derived
earlier from the CS modeling reveals differences in several cases. The reasons of such differences are probably connected
with the presence of density inhomogenities on the scales smaller than the telescope beam. In most cases non-thermal velocity
dispersions are in agreement with the values obtained from molecular line observations. |
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