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The Relation Between Dust and Gas in the Taurus Molecular Cloud

  • M. Röllig, R. Simon, V. Ossenkopf, J. Stutzki, J.L. Pineda (a1), P.F. Goldsmith (a1), N.L. Chapman (a1), R. Snell (a2), D. Li (a1), L. Cambrésy (a3) and C. Brunt (a4)...

Abstract

We report a study of the relation between dust and gas over a 100 deg2 area in the Taurus molecular cloud. We compare the H2 column density derived from dust extinction with the CO column density derived from the 12CO and 13CO J = 1 → 0 lines. We derive the visual extinction from reddening determined from 2MASS data. The comparison is done at an angular size of 200′′, corresponding to 0.14 pc at a distance of 140 pc. We find that the relation between visual extinction AV and N(CO) is linear between AV ≃ 3 and 10 mag in the region associated with the B213–L1495 filament. In other regions the linear relation flattens for AV ≳ 4 mag. Accounting for the observed relation between the column density of CO and CO2 ices and AV, we find a linear relationship between the column of carbon monoxide and dust for observed visual extinctions up to the maximum value in our data  ≃23  mag.

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The Relation Between Dust and Gas in the Taurus Molecular Cloud

  • M. Röllig, R. Simon, V. Ossenkopf, J. Stutzki, J.L. Pineda (a1), P.F. Goldsmith (a1), N.L. Chapman (a1), R. Snell (a2), D. Li (a1), L. Cambrésy (a3) and C. Brunt (a4)...

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