Modeling radiative transfer in molecular clouds. 1: HCO(+) in the star-forming region W49A North

Details Modeling radiative transfer in molecular clouds. 1: HCO(+) in the star-forming region W49A North Modeling radiative transfer in molecular clouds. 1: HCO(+) in the star-forming region W49A North

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437..222d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 1, p. 222-238

Astronomy and Astrophysics

Astrophysics

23

Astronomical Models, Formyl Ions, H Ii Regions, Interstellar Matter, Molecular Clouds, Radiative Transfer, Star Formation, Computerized Simulation, Mathematical Models

Scientific paper

A new general multilevel, non-Local Thermodynamic Equilibrium (LTE) radiative transfer code, valid for any velocity field, is applied to HCO(+) observations of W49A North. Three classes of collapse models are considered: free-fall collapse (v proportional to 1/sq. root of r), rho proportional to r-3/2 throughout the molecular cloud, successfully reproduces the features of the observations and gives the best fit to the J = 1-0 and J = 3-2 profiles both toward the prominent H II component G of W49A North and off the center. In addition to a slow radial fall-off of density, the theoretical modeling implies the following for the molecular cloud: the large line widths result from motions occurring within the inner 1 pc, and there are probably one or more fragments with peculiar velocities within this same region.

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