CH as a tracer of a translucent cloud boundary

Details CH as a tracer of a translucent cloud boundary CH as a tracer of a translucent cloud boundary

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408..559m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 408, no. 2, p. 559-564.

Astronomy and Astrophysics

Astrophysics

11

Hydrocarbons, Hyperfine Structure, Interstellar Matter, Methylidyne, Molecular Clouds, Molecular Gases, Radio Spectra, Electron Transitions, Emission Spectra, Line Of Sight

Scientific paper

We report the detection of broad wings in the CH 3335 MHz hyperfine ground state transition for three positions in the high-latitude molecular cloud MBM 16. These wings are not due to star formation and are not detected with the CO(J = 1-0) line. They may be the radio analog of broad CH lines recently noted in optical spectra of the diffuse cloud in front of Zeta Oph. Since the CH wings are not visible with the CO(J = 1-0) transition, they may provide a way to trace the low-density molecular hydrogen gas in the region between the dense molecular portion of the cloud and the surrounding atomic hydrogen envelope.

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