Temperatures of galactic molecular clouds showing CO self-absorption

Details Temperatures of galactic molecular clouds showing CO self-absorption Temperatures of galactic molecular clouds showing CO self-absorption

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..512p&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 512-528.

Astronomy and Astrophysics

Astrophysics

82

Carbon Monoxide, Gas Temperature, Interstellar Gas, Molecular Clouds, Nebulae, Self Absorption, Astronomical Models, Brightness Temperature, Emission Spectra, Line Spectra, Spectral Line Width, Spectrum Analysis, Stellar Evolution, Thermodynamic Equilibrium

Scientific paper

The CO J = 2-1 line has been observed and, in most cases, mapped in 10 star-forming molecular clouds (W3, NGC 1333, NGC 2071, Mon R2, CRL 961, Rho Oph, W49N, W51A, DR 21, and Cep A). The CO J = 3-2 line has been observed in W3 and DR 21. The CO lines from all these sources are strongly self-absorbed. By comparing the present results with published CO(1-0) line profiles, it is found that large corrections to the temperatures of the cloud cores, as measured by the CO(1-0) lines, are required. The corrections for self-absorption bring the CO brightness temperatures into closer agreement with the grain temperatures inferred from far-IR photometry.

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