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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709743.0, MPI für Astronomie / Publikationen_mpia
Kinematic structure of massive star-forming regions. I. Accretion along filaments
Authors:Tackenberg, J.; Beuther, H.; Henning, T.; Linz, H.; Sakai, T.; Ragan, S. E.; Krause, O.; Nielbock, M.; Hennemann, M.; Pitann, J.; Schmiedeke, A.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Astronomy and Astrophysics
Start Page:id. A101 (25 pp)
Audience:Not Specified
Abstract / Description:Context. The mid- and far-infrared view on high-mass star formation, in particular with the results from the Herschel space observatory, has shed light on many aspects of massive star formation. However, these continuum studies lack kinematic information. <BR /> Aims: We study the kinematics of the molecular gas in high-mass star-forming regions. <BR /> Methods: We complemented the PACS and SPIRE far-infrared data of 16 high-mass star-forming regions from the Herschel key project EPoS with N2H+ molecular line data from the MOPRA and Nobeyama 45 m telescope. Using the full N2H+ hyperfine structure, we produced column density, velocity, and linewidth maps. These were correlated with PACS 70 mum images and PACS point sources. In addition, we searched for velocity gradients. <BR /> Results: For several regions, the data suggest that the linewidth on the scale of clumps is dominated by outflows or unresolved velocity gradients. IRDC 18454 and G11.11 show two velocity components along several lines of sight. We find that all regions with a diameter larger than 1 pc show either velocity gradients or fragment into independent structures with distinct velocities. The velocity profiles of three regions with a smooth gradient are consistent with gas flows along the filament, suggesting accretion flows onto the densest regions. <BR /> Conclusions: We show that the kinematics of several regions have a significant and complex velocity structure. For three filaments, we suggest that gas flows toward the more massive clumps are present. Table 3 and Appendix A are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201321555/olm">http://www.aanda.org</A>
Free Keywords:stars: formation; stars: kinematics and dynamics; ISM: kinematics and; dynamics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201321555
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