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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709817.0, MPI für Astronomie / Publikationen_mpia
Gas kinematics and excitation in the filamentary IRDC G035.39-00.33
Authors:Jiménez-Serra, I.; Caselli, P.; Fontani, F.; Tan, J. C.; Henshaw, J. D.; Kainulainen, J.; Hernandez, A. K.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:2
Start Page:1996
End Page:2013
Audience:Not Specified
Abstract / Description:Some theories of dense molecular cloud formation involve dynamical environments driven by converging atomic flows or collisions between preexisting molecular clouds. The determination of the dynamics and physical conditions of the gas in clouds at the early stages of their evolution is essential to establish the dynamical imprints of such collisions, and to infer the processes involved in their formation. We present multitransition 13CO and C18O maps towards the IRDC G035.39-00.33, believed to be at the earliest stages of evolution. The 13CO and C18O gas is distributed in three filaments (Filaments 1, 2 and 3), where the most massive cores are preferentially found at the intersecting regions between them. The filaments have a similar kinematic structure with smooth velocity gradients of ˜0.4-0.8 km s-1 pc-1. Several scenarios are proposed to explain these gradients, including cloud rotation, gas accretion along the filaments, global gravitational collapse and unresolved sub-filament structures. These results are complemented by HCO+, HNC, H13CO+ and HN13C single-pointing data to search for gas infall signatures. The 13CO and C18O gas motions are supersonic across G035.39-00.33, with the emission showing broader linewidths towards the edges of the infrared dark cloud (IRDC). This could be due to energy dissipation at the densest regions in the cloud. The average H2 densities are ˜5000-7000 cm-3, with Filaments 2 and 3 being denser and more massive than Filament 1. The C18O data unveil three regions with high
Free Keywords:stars: formation; ISM: individual objects: G035.39-00.33; ISM: molecules
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stu078
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