A New Derivation of the Extinction-to-CO Column Density Ratio in the Chamaeleon I Dark Cloud

Details A New Derivation of the Extinction-to-CO Column Density Ratio in the Chamaeleon I Dark Cloud A New Derivation of the Extinction-to-CO Column Density Ratio in the Chamaeleon I Dark Cloud

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..919h&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.919-929.

Astronomy and Astrophysics

Astronomy

21

Ism: Clouds, Ism: Dust, Extinction, Ism: Individual (Chamaeleon I), Ism: Molecules

Scientific paper

We have analyzed new datasets of 13CO\ (J = 1-0) and C18O\ (J = 1-0) emission obtained with NANTEN and visual extinction, AV, derived from DENIS J-band observations in the Chamaeleon I dark cloud. The column densities of both molecular isotopes, N(13CO) and N(C18O), have been derived assuming LTE. Both N(13CO) and N(C18O) are linearly correlated with AV in the range AV<~ 10 mag. We established the relationships N(13CO) (cm-2)=(1.2+/- 0.1)times 1015AV(mag)+(0.7+/- 0.3)times 1015 and N(C18O) (cm-2)=(3.5+/- 0.3)times 1014AV(mag)-(5.7+/- 1.3)times 1014. In a region of clustered T Tauri stars, however, both the AV-N(13CO) and AV-N(C18O) relationships are by a factor of ~ 2 steeper than the above. This may be mainly due to underestimates of the AV values, and the J-band star count might deserve a more careful examination for possible underestimates of associated young stars. Compared with the relationships for the other clouds, the slope of the AV-N(13CO) relationship is relatively shallower and that of the AV-N(C18O) relationship in a non-cluster forming region is slightly steeper. These facts suggest that cloud-to-cloud variation is significant in the AV-N(CO) relationships.

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