Computer Science
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..143s&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 143-145
Computer Science
Scientific paper
A lot of interstellar clouds are the sources of star formation. Observations of bipolar outflows testify the process of star birth and their evolution in a cloud. Millimeter and infrared emissions from molecular clouds are under investigation in many observational programs. Interpretation of the observational data requires to develop molecular cloud models in order to compare the observed and simulated emission characteristics. We propose a numerical model for calculation of radiation of molecular lines from a cloud having the bipolar structure. It is assumed that the cloud has two kinds of symmetry: axial symmetry around the Z axis, and symmetry relative to the plane XY (Fig. 1). In this paper we calculate the CO molecule radiation, but the method can be easily applied to the calculation of arbitrary molecules having known excitation coefficients. The first 6 rotation transitions of CO molecule are considered under its excitation by Hydrogen molecules with account of cosmic microwave background. The model allows to specify any distribution laws for concentration of CO, H2, the kinetic temperature, and velocities in the plane XZ. Using the linear approximation allows to obtain higher than in Monte-Carlo [1, 2] method accuracy of the determination of the mean intensity of the radiation field, and the excitation temperature in a cloud.
Antuyfeyev A.
Shulga V. V.
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