The CO to H2 Conversion Factor in Normal Late-Type Galaxies

Details The CO to H2 Conversion Factor in Normal Late-Type Galaxies The CO to H2 Conversion Factor in Normal Late-Type Galaxies

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ap%26ss.281..127b&link_type=abstract

Astrophysics and Space Science, v. 281, Issue 1, p. 127-128 (2002).

Astronomy and Astrophysics

Astrophysics

19

Scientific paper

The molecular gas mass in nearby galaxies is generally estimated using 12CO(1-0) line intensities and assuming the X conversion factor between I(CO) and N(H2) measured in the solar neighborhood. It is however known that this X conversion factor is not universal since it changes with metallicity, cosmic ray density and UV radiation field. Far-IR data in the spectral range 100-1000 μm can be used to estimate the molecular gas content of late-type galaxies in an independent way of CO line measurements once a metallicity-dependent dust to gas ratio is assumed, allowing a direct estimate of X. This exercise is presented here for a large sample of galaxies with available multifrequency data. X spans from ˜ 1020 mol cm-2 (K km s-1)-1 in giant spirals to ˜ 1021 mol cm-2 (K km s-1)-1 in dwarf irregulars.

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