The relationship of CO abundance to extinction and N(H2):. Observations of globules and the dependence on star formation activity

Details The relationship of CO abundance to extinction and N(H2):. Observations of globules and the dependence on star formation activity The relationship of CO abundance to extinction and N(H2):. Observations of globules and the dependence on star formation activity

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...421.1087h&link_type=abstract

Astronomy and Astrophysics, v.421, p.1087-1099 (2004)

Astronomy and Astrophysics

Astrophysics

18

Ism: General, Ism: Abundances, Ism: Molecules

Scientific paper

We have studied the ratio of 13CO and C18O column densities to the extinction AJ of background field stars in the direction of three globules: B 133, B 335, L 466. Selected positions in the globules were observed in the 12CO(J=1-0) line and in J=1-0 and J=2-1 transitions of 13CO and C18O using the 15-m Swedish-ESO Submillimetre Telescope (SEST) in Chile. One of the clouds, L 466, was also mapped in the C18O(J=1-0) line. In addition to the N(13CO)/AJ and N(C18O)/AJ ratios also the ratios of N(13CO) and N(C18O) to AV and N(H2) are given. These ratios were found to vary from cloud to cloud so that they are larger in B 335 than in B 133 and L 466. These variations are thought to primarily arise from variations of the column density ratio of CO and its isotopes to H2. The alternative explanation in terms of the N(H2)/AJ ratio being larger in starforming regions (B 335) than in more quiescent regions lacking star formation (B 133 and L 466) appears less likely. We also discuss the evidence for N(CO)/AJ variations on the basis of previous observations in star forming and non-star forming dark clouds.
Appendix A is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/421/1087
Appendices B and C are only available in electronic form at http://www.edpsciences.org

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