Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...429..181p&link_type=abstract
Astronomy and Astrophysics, v.429, p.181-192 (2005)
Astronomy and Astrophysics
Astrophysics
41
Ism: Abundances, Ism: Molecules, Ism: Dust, Extinction, Ism: Individual: Objects: L183 (L134N), Radio Lines: Ism
Scientific paper
We present a detailed study of the gas depletion in L183 (= L134N) for a set of important species, namely, CO, CS, SO, N_2H+ and NH_3. We show that all these species are depleted at some level. This level seems to depend mostly on a density threshold rather than on dust opacity. Therefore UV shielding would not be a main factor in the triggering of depletion. Our data suggest that CO, CS and SO depletion happen at densities of ˜3 × 104 cm-3, while N_2H+b and NH_3 seem to deplete at densities close to 106 cm-3. The latter result is consistent with the Bergin & Langer (\cite{Bergin97}, ApJ, 486, 316) polar (H_2O) ice case but not with the more recent models of Aikawa et al. (\cite{Aikawa03}, ApJ, 593, 906). CS depletion occurs much below its (J:2-1)b critical density, (7 × 105 cm-3) and therefore makes this species unsuitable to study the density structure of many dark cloud cores.
Based on observations made with the CFHT, the Iram 30-m and the ARO 12-m (formerly NRAO 12-m).
Appendix A is only available in electronic form at http://www.edpsciences.org
Apponi Aldo Joseph
Bacmann Aurore
Cabrit Silvie
Pagani Laurent
Pardo Juan Ramon
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