Modelling the constancy of X

Details Modelling the constancy of X Modelling the constancy of X

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.216..153t&link_type=abstract

Astrophysics and Space Science, vol. 216, no. 1-2, p. 153-154

Astronomy and Astrophysics

Astrophysics

Astronomical Models, Carbon Monoxide, Cooling, Hydrogen, Interstellar Gas, Molecular Clouds, Molecular Gases, Abundance, Interstellar Chemistry, Oxygen

Scientific paper

Observations of the CO J = 1 - 0 line are commonly used as a tracer for molecular material in clouds. The ratio of the H2 column density to the integrated intensity of this line, X, is often taken to be constant, despite theoretical and observational uncertainty. We have tried to identify how this ratio depends on cloud parameters, testing a simple theoretical argument suggesting its invariance with respect to density. The apparent constancy can be understood if clouds are clumpy on scales of AV approximately = 1-2 mag.

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