CO Column Density and Extinction in the Chamaeleon II--III Dark-Cloud Complex

Details CO Column Density and Extinction in the Chamaeleon II--III Dark-Cloud Complex CO Column Density and Extinction in the Chamaeleon II--III Dark-Cloud Complex

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53.1109h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 1109-1118

Astronomy and Astrophysics

Astronomy

19

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

Scientific paper

We carried out 13CO (J = 1 -- 0) and C18O (J = 1 -- 0) observations of the Chamaeleon II--III dark-cloud complex with the NANTEN radio telescope. The column densities of both molecular isotopes were derived assuming LTE. The AV values were obtained by scaling the AV values that were derived using an adaptive-grid star-count method applied to the DENIS J-band data. We established the AV--CO isotope column-density relations in Cha II and III, and compared them with those in Cha I. The slopes of the AV--13CO relations for Cha II and III are steeper than that for Cha I. Those of the AV -- C18O relations are similar among the three clouds. The total column density ratio, N(13O) / N(C18O, in Cha I tends to be small compared with those in Cha II or Cha III; the ratios range from ~ 5 to ~ 25 at low extinction in Cha II and III, but at most ~ 10 in Cha I. We suggest that the increase of N(13CO) due to the 13CO formation process causes cloud-to-cloud variations in the AV -- N(13CO) correlation.

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