Astronomy and Astrophysics, volume 351, 292-302 (1999/11-1)
Ices and extinction through the Taurus and Ophiuchus clouds.
TEIXEIRA T.C. and EMERSON J.P.
Abstract (from CDS):
A detailed intercomparison is made between published observations of H2
O and CO ices towards the Taurus and Ophiuchus dark clouds. The column densities of the ices are intercompared, and each compared to the visual extinction through the clouds, Av
. It is neither clear that the two clouds have different or well defined threshold extinctions for the survival of ice mantles, nor that, for each of the clouds, the thresholds for the survival of CO and H2
O mantles are different. The inclusion of new objects in Taurus (Teixeira et al., 1998A&A...330..711T
) introduces a large scatter in the relations between those quantities relative to results obtained by previous authors. Lines-of-sight towards deeply embedded Young Stellar Objects in Taurus appear to show an enhancement in the amount of water-ice relative to lines-of-sight towards field stars behind that cloud. While for Av
<14mag there is a tight correlation between the water-ice column density, Ns
O), and Av
, the inclusion of those new objects reveals a discontinuity in the relation between Ns
O) and Av
. The interpretation of this discontinuity is discussed.
stars: formation - ISM: clouds - ISM: dust, extinction - ISM: molecules - infrared: ISM: lines and bands
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