(C-13)O emission in the irregular galaxy NGC 55 and the IR-luminous galaxy NGC 3256

Details (C-13)O emission in the irregular galaxy NGC 55 and the IR-luminous galaxy NGC 3256 (C-13)O emission in the irregular galaxy NGC 55 and the IR-luminous galaxy NGC 3256

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..454b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 454-456.

Astronomy and Astrophysics

Astrophysics

10

Carbon Monoxide, Carbon 13, Emission Spectra, Galactic Structure, Infrared Radiation, Irregular Galaxies, Brightness Distribution, Galactic Radiation, Line Spectra, Metallicity

Scientific paper

The detection of (C-13)O emission in the Magellanic-type irregular galaxy NGC 55 and in the IR-luminous galaxy NGC 3256 is reported. The (C-12)O/(C-13)O intensity ratio for NGC 55 is 15 +/- 3, which is still consistent with values observed in normal spiral galaxies. The ratio in NGC 3256, however, is 29 +/- 6, much higher than typical values observed in spiral galaxies. The high ratio in NGC 3256 might be due to a higher gas kinetic temperature (and hence a lower (C-13)O opacity) in the CO emitting region, as compared to normal galaxies.

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