Interstellar HCO/+/ self-reversals

Details Interstellar HCO/+/ self-reversals Interstellar HCO/+/ self-reversals

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..568l&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Dec. 1, 1980, p. 568-575.

Astronomy and Astrophysics

Astrophysics

21

Formic Acid, Interstellar Matter, Molecular Clouds, Radio Spectra, Line Spectra, Molecular Ions, Optical Thickness

Scientific paper

A similarity exists between the shapes of HCO(+) self-reversals observed toward a number of molecular clouds where the CO line profiles are self-reversed. The HCO(+) is not thermalized as shown by its line intensities whose strengths are only one-tenth of the CO intensities; the self-reversals tend to be deeper in HCO(+). The self-reversals and broad line wings in the HCO(+) show the significance of radiative trapping resulting from high optical depth in HCO(+) excitation. It is predicted that the J = 3-2HCO(+) line profiles portions of the clouds where the HCO(+) abundance is high but density is too low to thermalize the molecule will not have the prominent self-reversals shown in the J = 1-0 HCO(+) lines.

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