/C-13/O self-absorption in the Rho Ophiuchi dark cloud

Details /C-13/O self-absorption in the Rho Ophiuchi dark cloud /C-13/O self-absorption in the Rho Ophiuchi dark cloud

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..620l&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 620-626.

Astronomy and Astrophysics

Astrophysics

31

Abundance, Carbon 13, Interstellar Gas, Molecular Gases, Nebulae, Self Absorption, Absorption Spectra, Carbon Monoxide, Carbon 12, Emission Spectra, Gas Density, Gas Temperature, High Resolution, Line Spectra, Opacity, Stellar Evolution

Scientific paper

Self-absorption in (C-13)O emission has been found in the course of a study of high-resolution (C-12)O, (C-13)O, and C(O-18) profiles in the Rho Ophiuchi dark cloud complex. These observations suggest very large column densities of hydrogen (i.e., 3 x 10 to the 23rd per sq cm or greater than 100 mag) at the position of the (C-13)O self-absorption. C(O-18) observations indicate that large column-density gradients exist in the source. The high spatial gas density implied by the observations suggests that the gas and dust are in thermal equilibrium. However, this is not consistent with FIR observations unless a very large column (greater than 400 mag) of cold dust exists in the outer portions of the cloud.

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