Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219l..11w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. L11-L15.
Astronomy and Astrophysics
Astronomy
3
Abundance, Emission Spectra, Molecular Gases, Starburst Galaxies, Carbon Monoxide, Color-Color Diagram, Infrared Astronomy Satellite, Optical Thickness, Star Formation Rate
Scientific paper
CO (J = 1-0) emission is detected in the galaxy IRAS 0833 + 652. The molecular gas mass, determined from the integrated CO intensity and assuming optically thick emission, is found to be 1.2 x 10 to the 9th solar masses. Assuming a tau much less than 1 and an excitation temperature of 50 K, the H2 mass becomes 2 x 10 to the 8th solar masses. The current star formation rate, determined from the far-IR luminosity, is found to be very high, 55 solar masses per yr. The inferred gas consumption time is less than 10 to the 8th years (in the case of optically thin emission it is less than 10 to the 7th years), indicating that 0833 + 652 is a true starburst system. The lack of any visible companion indicates that the episodic star forming activity in 0833 + 652 may be intrinsic to the galaxy, or that infall of intergalactic gas clouds has triggered the present star formation activity.
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