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Modelling the constancy of X (1994)

Taylor, S. D. ; Williams, D. A. ; Hartquist, T. W.

Springer

Astrophysics and space science 216 (1994), S. 153-154

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ISSN: 1572-946X

Keywords: Chemistry ; Molecular Hydrogen ; Cloud Models

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract 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 ≈ 1-2 mag.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00982486

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