CO-to-H2 conversion factor in dwarf irregular galaxies

Details CO-to-H2 conversion factor in dwarf irregular galaxies CO-to-H2 conversion factor in dwarf irregular galaxies

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45l..21o&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 2, p. L21-L26.

Astronomy and Astrophysics

Astronomy

30

Carbon Monoxide, Dwarf Galaxies, Emission Spectra, Gas Density, Hydrogen, Irregular Galaxies, Interstellar Gas, Molecular Clouds

Scientific paper

The correlation between the CO-to-H2 conversion factor and the physical properties of galaxies is investigated by examining results of CO observations of five nearby dwarf irregular galaxies, made with a beam size of 15 arcsec, which is comparable to the size of a giant molecular cloud in the galaxies. The relation between the CO luminosities and the line widths of molecular clouds was examined in 12 galaxies, including previous observations. It was found that the CO luminosity for the same line width decreases with decreasing metallicity (O/H) of a galaxy and that the CO-to-H2 conversion factor increases as the metallicity of a galaxy decreases.

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