The detection of CN and HNC mm-wave absorption lines in spiral-arm gas clouds

Details The detection of CN and HNC mm-wave absorption lines in spiral-arm gas clouds The detection of CN and HNC mm-wave absorption lines in spiral-arm gas clouds

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..231n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 231-236. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

21

Absorption Spectra, Hydrocyanic Acid, Interstellar Gas, Line Spectra, Millimeter Waves, Molecular Clouds, Interstellar Matter, Milky Way Galaxy, Molecular Gases, Radio Attenuation

Scientific paper

Radio absorption lines have been detected from the J = 1-0 transition of HNC and the N = 1-0 transition of CN toward a few Galactic continuum sources. Column densities and abundance ratios are derived, and it is argued that the results can be best explained if the absorption lines arise in the outer envelopes of molecular clouds along the line of sight. These clouds provide a shadowing effect so that the radiation field along the line of sight is much reduced from that estimated from the visual extinction.

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