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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 709854.0, MPI für Astronomie / Publikationen_mpia
ATLASGAL-selected massive clumps in the inner Galaxy. I. CO depletion and isotopic ratios
Authors:Giannetti, A.; Wyrowski, F.; Brand, J.; Csengeri, T.; Fontani, F.; Walmsley, C. M.; Nguyen Luong, Q.; Beuther, H.; Schuller, F.; Güsten, R.; Menten, K. M.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Astronomy and Astrophysics
Volume:570
Start Page:id. A65 (55 pp)
Audience:Not Specified
Abstract / Description:Context. In the low-mass regime, molecular cores have spatially resolved temperature and density profiles allowing a detailed study of their chemical properties. It is found that the gas-phase abundances of C-bearing molecules in cold starless cores rapidly decrease with increasing density. Here the molecules tend to stick to the grains, forming ice mantles. <BR /> Aims: We study CO depletion in a large sample of massive clumps, and investigate its correlation with evolutionary stage and with the physical parameters of the sources. Moreover, we study the gradients in [12C]/[13C] and [18O]/[17O] isotopic ratios across the inner Galaxy, and the virial stability of the clumps. <BR /> Methods: From the ATLASGAL 870 mum survey we selected 102 clumps, which have masses in the range ~ 102 - 3 × 104M&sun;, sampling different evolutionary stages. We use low-J emission lines of
Free Keywords:ISM: abundances; ISM: clouds; ISM: molecules
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201423692
URL:http://cdsads.u-strasbg.fr/abs/2014A%26A...570A..6...
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