CH, CO, and E(B-V) as Molecular Gas Tracers in a Translucent Cloud

Details CH, CO, and E(B-V) as Molecular Gas Tracers in a Translucent Cloud CH, CO, and E(B-V) as Molecular Gas Tracers in a Translucent Cloud

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...586.1111m&link_type=abstract

The Astrophysical Journal, Volume 586, Issue 2, pp. 1111-1119.

Astronomy and Astrophysics

Astronomy

17

Ism: Abundances, Ism: Clouds, Ism: Molecules, Molecular Processes

Scientific paper

The effectiveness of three molecular hydrogen gas tracers-the CH 2Π1/2, J=1/2, F=1-1 transition, the CO(1-0) transition, and the color excess, E(B-V)-is evaluated for the translucent molecular cloud MBM 16. The CH emission line and E(B-V) are well correlated with each other but not with the CO(1-0) emission line. It is likely that in translucent molecular clouds CO is not a linear tracer of the molecular hydrogen column density because, in these objects, the CO/H2 ratio is undergoing rapid fluctuations as a function of the molecular hydrogen column density. For translucent and diffuse molecular clouds, and possibly for the translucent envelopes of giant molecular clouds, CH observations should be used to calibrate the CO to H2 conversion factor.

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