Interstellar O2. I - Abundance, excitation, and prospects for detection of O-16O-18 at radio frequencies

Details Interstellar O2. I - Abundance, excitation, and prospects for detection of O-16O-18 at radio frequencies Interstellar O2. I - Abundance, excitation, and prospects for detection of O-16O-18 at radio frequencies

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..562b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 562-568.

Astronomy and Astrophysics

Astrophysics

40

Abundance, Interstellar Gas, Molecular Clouds, Molecular Excitation, Oxygen Isotopes, Radio Frequencies, Brightness Temperature, Carbon Monoxide, Gas Temperature, Interstellar Chemistry, Molecular Gases, Vapor Phases

Scientific paper

Molecular oxygen, O2, is predicted to be an important constituent of the interstellar gas, but it has not yet been detected in interstellar clouds. In this paper, the gas-phase production and destruction of O2 are reconsidered, a non-LTE calculation of level populations at cloud temperatures is presented, and O2 column densities in diffuse and dark clouds are predicted. Ground-based detection of the 234 GHz line of 16O18O is shown to be feasible; if CO and O2 are comparable in abundance in clouds similar to the Taurus molecular cloud or in giant molecular clouds, the brightness temperature is predicted to be 0.1K.

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