On the interpretation of carbon monoxide self-absorption profiles seen toward embedded stars in dense interstellar clouds

Details On the interpretation of carbon monoxide self-absorption profiles seen toward embedded stars in dense interstellar clouds On the interpretation of carbon monoxide self-absorption profiles seen toward embedded stars in dense interstellar clouds

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214l..73l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 214, June 1, 1977, p. L73-L78.

Physics

114

Carbon Monoxide, Interstellar Matter, Line Spectra, Self Absorption, Astronomical Models, Cloud Physics, Gravitational Collapse, Radiative Transfer, Velocity Distribution

Scientific paper

The letter critically examines the assumptions used in the recent interpretation of CO self-absorption profiles seen toward embedded stars in dense interstellar clouds that have led to the conclusion that one can uniquely establish that these clouds are collapsing. It is shown that the Sobolev approximation used in these calculations is invalid for the velocity fields considered previously and that the line profiles computed with this approximation are inaccurate. The radiative-transfer problem is formulated and solved without restrictions, and the expected line profiles are calculated for expanding and collapsing clouds; neither model provides an adequate description of the observed profiles. Focusing on the CO profile seen toward Mon R2, the constraints that the observed profile places on the physical model are enumerated and a physically self-consistent picture is obtained in which turbulence, expansion, and contraction all play a role in producing the observed profile.

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