Detection of HNCO in external galaxies

Details Detection of HNCO in external galaxies Detection of HNCO in external galaxies

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241l..33n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 2, Jan. 1991, p. L33-L36.

Astronomy and Astrophysics

Astrophysics

32

Galactic Nuclei, Intergalactic Media, Interstellar Chemistry, Interstellar Matter, Isocyanates, Astronomical Spectroscopy, Electron Transitions, Emission Spectra

Scientific paper

The paper reports the first detection of HNCO from external galaxies through its 4(04)-3(03) and 6(06)-5(05) transitions. In NGC 253, if the source is extended, an observed (6/06/-5/05/)/(4/04/-3/03/) line ratio of about 2, close to the LTE value (2.2), suggests that the HNCO emission arises in a warm (Tex not less than 50 K) and optically thin medium with a column density of 1.8 x 10 to the 14th/sq cm. In the case of an unresolved source, the data can be interpreted in terms of an optically thick source with a beam filling factor of 0.005-0.0005.

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