CO Observations of the Dwarf Starburst Galaxy NGC 5253 and the I_CO/N_H_2 Ratio

Details CO Observations of the Dwarf Starburst Galaxy NGC 5253 and the I_CO/N_H_2 Ratio CO Observations of the Dwarf Starburst Galaxy NGC 5253 and the I_CO/N_H_2 Ratio

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7515t&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #75.15; Bulletin of the American Astronomical Society, Vol. 26, p.1433

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present observations of the 3 mm continuum and CO emission in the dwarf galaxy NGC 5253. NGC 5253 appears to be undergoing a recent burst of star formation which may be tidally induced by its companion, M83. These aperture synthesis maps were made with the Owens Valley Millimeter Array, and have a resolution of 12('') x 7('') . There is strong thermal continuum emission at 3 mm at the location of the starburst. However the CO emission is extraordinarily weak. This indicates that CO is a poor tracer of the H_2 mass in this galaxy, since the high resolution of the maps rules out beam dilution as a cause of the low single dish CO temperatures. We present a value for the conversion factor from CO intensity to H_2 column density, ICO/NH_2. This work was supported in part by NSF grant AST90-22996.

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