The relation between carbon monoxide emission and visual extinction in the local Perseus dark clouds

Details The relation between carbon monoxide emission and visual extinction in the local Perseus dark clouds The relation between carbon monoxide emission and visual extinction in the local Perseus dark clouds

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...166..283b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 166, no. 1-2, Sept. 1986, p. 283-290.

Astronomy and Astrophysics

Astronomy

127

Abundance, Carbon Monoxide, Interstellar Extinction, Molecular Clouds, Emission Spectra, Ultraviolet Astronomy

Scientific paper

An analysis of nearly 1200 measurements of 13CO column density and visual extinction Av in the Perseus complex, leads to the relation in the range 1 mag < Av < 5 mag. This result is compared to those of Cernicharo and Guelin (1986) in the Taurus cloud Heiles cloud 2. The 13CO/Av ratio differs by a factor of ≍ 2. We interpret this difference as due, mainly, to the enhanced ultraviolet field in Perseus owing to OB stars (such a strong ultraviolet field is implicated by optical and IRAS data). The 13CO data are affected for large Av by line saturation and for small Av by isotopic fractionation. These effects are reduced for C18O in the range of visual extinction considered here. However, the observed differences of the 13CO abundance in local dark clouds are within a factor of 2. This small factor (in comparison with other uncertainties in mass calculations) and the intensity of the 13CO lines (>- 5 times stronger than C18O lines) makes 13CO the best gas tracer for extended molecular clouds.

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