Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348502p&link_type=abstract
American Astronomical Society, AAS Meeting #213, #485.02; Bulletin of the American Astronomical Society, Vol. 41, p.455
Astronomy and Astrophysics
Astronomy
Scientific paper
Interstellar dust and gas are the primary constituents of interstellar clouds, and provide the primary tools for tracing the structure and determining the mass of extended clouds as well as more compact, dense regions within which new stars form. In this project, we compare the H2 column density derived from a dust extinction map of the Taurus Molecular Cloud with that derived using 12CO and 13CO data from Goldsmith et al. 2008. The relation between visual extinction Av and N(H2) derived from CO observations is linear for Av < 10 mag while for larger visual extinctions the latter method underestimates the extinction-based H2 column density by up to a factor of 5. Using the RATRAN radiative transfer code, we find that the origin of this deviation from a linear relation is an underestimation of the optical depth of the observed molecular gas, due to lower excitation temperatures at high-column density regions than derived from 12CO. We present an empirical factor that corrects the N(H2) derived from CO observations at large visual extinctions.
Cambresy Laurent
Chapman Neil
di Lun
Goldsmith Paul F.
Krco Marko
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