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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents ID: 731846.0, MPI für Astronomie / Publikationen_mpia Mid-J CO shock tracing observations of infrared dark clouds. II. Low-J CO constraints on excitation, depletion, and kinematics Authors: Pon, A.; Johnstone, D.; Caselli, P.; Fontani, F.; Palau, A.; Butler, M. J.; Kaufman, M.; Jiménez-Serra, I.; Tan, J. C. Date of Publication (YYYY-MM-DD): 2016 Title of Journal: Astronomy and Astrophysics Volume: 587 Start Page: id. A96 ( 23 pp) Audience: Not Specified Abstract / Description: Infrared dark clouds are kinematically complex molecular structures in the interstellar medium that can host sites of massive star formation. We present maps measuring 4 square arcminutes of the 12CO, 13CO, and C18O J = 3 to 2 lines from selected locations within the C and F (G028.37+00.07 and G034.43+00.24) infrared dark clouds (IRDCs), as well as single pointing observations of the 13CO and C18O J = 2 to 1 lines towards three cores within these clouds. We derive CO gas temperatures throughout the maps and find that CO is significantly frozen out within these IRDCs. We find that the CO depletion tends to be the highest near column density peaks with maximum depletion factors between 5 and 9 in IRDC F and between 16 and 31 in IRDC C. We also detect multiple velocity components and complex kinematic structure in both IRDCs. Therefore, the kinematics of IRDCs seem to point to dynamically evolving structures yielding dense cores with considerable depletion factors. Based on observations carried out with the JCMT and IRAM 30 m Telescopes. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).IRAM CO observations are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/587/A96">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/587/A96</A> Free Keywords: ISM: clouds; stars: formation; ISM: molecules; ISM: kinematics and dynamics; ISM: structure; ISM: abundances External Publication Status: published Document Type: Article Communicated by: N. N. Affiliations: MPI für Astronomie Identifiers: ISSN:0004-6361 %R 10.1051/0004-6361/201527154 URL:http://cdsads.u-strasbg.fr/abs/2016A%26A...587A..9... The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.