Observations of several new transitions of interstellar HCO

Details Observations of several new transitions of interstellar HCO Observations of several new transitions of interstellar HCO

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..360s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 1, 1985, p. 360-368. Research supported by the University of Illi

Astronomy and Astrophysics

Astrophysics

13

Astronomical Spectroscopy, Formyl Ions, Free Radicals, Interstellar Matter, Molecular Clouds, Abundance, Emission Spectra, Hydrogen, Line Spectra, Molecular Spectra

Scientific paper

Four new transitions of the interstellar formyl radical, HCO have been detected. Five transitions are now known for interstellar HCO, and thus its identification is secure. The column density found by assuming NGC 2024 is an extended source is N subT(HCO) = (8.5 + or - 4.0) x 10 to the 12th/sq cm. This gives a fractional abundance (abundance relative to hydrogen) for NGC 2024 which agrees quite well with some theoretical predictions. Several unidentified lines were detected and are reported here. Tentative identification for some of the unidentified lines are suggested.

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