Narayanan, Desika; Krumholz, Mark; Ostriker, Eve C.; Hernquist, Lars
Relating the observed CO emission from giant molecular clouds (GMCs) to the underlying H2 column density is a long-standing problem in astrophysics. While the Galactic CO–H2 conversion factor (XCO) appears to be reasonably constant, observations indicate that XCO may be depressed in high surface density starburst environments. Using a multiscale approach, we investigate the dependence of XCO on the galactic environment in numerical simulations of disc galaxies and galaxy mergers. XCO is...[Show more]
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