The ratio N(CO)/E(J-K) in local molecular clouds.

Details The ratio N(CO)/E(J-K) in local molecular clouds. The ratio N(CO)/E(J-K) in local molecular clouds.

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305..920h&link_type=abstract

Astronomy and Astrophysics, v.305, p.920

Astronomy and Astrophysics

Astrophysics

38

Interstellar Medium: Clouds, Abundances, Molecules, Radio Lines: Ism

Scientific paper

We have investigated the ratio of carbon monoxide column density to colour excess E(J-K) of background field stars in the direction of three different local clouds: the Coalsack, Chamaeleon I (Cha I) and R Coronae Australis (R CrA). For these dark clouds a uniform set of colour excess values towards highly reddened background stars is available from the literature based on near-infrared photometry data. Using the 15-m Swedish-ESO Submillimeter Telescope (SEST), we have observed towards these background stars the ^12^CO, ^13^CO and C^18^O J=1-0 emission lines and, in a few selected directions, the J=1-0 transition of C^17^O. We have also derived the N(CO)/A_V_ ratio and, based on a range of assumed gas-to-dust-ratios, the N(CO)/N(H_2_) ratio. We find that the N(CO) to E(J-K) ratio varies from cloud to cloud: it is a factor of ~2 larger in Cha I and R CrA than in the Coalsack. Our results can be interpreted in two alternative ways: firstly that the N(CO)/N(H_2_) ratio is higher in active star forming regions (Cha I, R CrA, and L 1641) than in more quiescent regions without star formation (Coalsack) and secondly that the ratio N(H_2_)/E(J-K) changes from cloud to cloud and is higher in active star forming regions than in quiescent clouds.

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