Submillimeter detection of extragalactic C I emission - IC 342

Details Submillimeter detection of extragalactic C I emission - IC 342 Submillimeter detection of extragalactic C I emission - IC 342

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397l..15b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 397, no. 1, p. L15-L17.

Astronomy and Astrophysics

Astrophysics

19

Carbon, Emission Spectra, Interstellar Matter, Spiral Galaxies, Submillimeter Waves, Electron Transitions, Extragalactic Radio Sources, Ground State, Milky Way Galaxy, Photodissociation

Scientific paper

We report observations of the 3P1-3P0 transition of atomic carbon at 492 GHz in IC 342, made at the Caltech Submillimeter Observatory, which represent the first extragalactic submillimeter detection of C I. The C I emission from IC 342 was found to have a main beam temperature of about 1 K, which is a factor of 2 greater than that for (C-13)O(2-1) in the same size beam. Comparing our data with COBE observations of the Milky Way, we find that the ratio of C I to CO(2-1) is approximately a factor of 2 lower in IC 342 than in our Galaxy. The result is interpreted in terms of photodissociation region models which require higher gas densities for IC 342 than for the Milky Way.

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