Universität zu Köln

Tackenberg, J., Beuther, H., Henning, Th, Linz, H., Sakai, T., Ragan, S. E., Krause, O., Nielbock, M., Hennemann, M., Pitann, J. and Schmiedeke, A. (2014). Kinematic structure of massive star-forming regions I. Accretion along filaments. Astron. Astrophys., 565. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

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. Aims. We study the kinematics of the molecular gas in high-mass star-forming regions. 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 mu m images and PACS point sources. In addition, we searched for velocity gradients. Results. For several regions, the data suggest that the linewidth on the scale of clumps is dominated by outflows or unresolved velocity gradients. IRDC18454 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. 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tackenberg, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beuther, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henning, Th UNSPECIFIED UNSPECIFIED UNSPECIFIED Linz, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sakai, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ragan, S. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krause, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nielbock, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hennemann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pitann, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmiedeke, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-439828
DOI:	10.1051/0004-6361/201321555
Journal or Publication Title:	Astron. Astrophys.
Volume:	565
Date:	2014
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INFRARED-DARK CLOUDS; H II REGIONS; MOLECULAR CLOUD; GALACTIC PLANE; PROTOSTELLAR CANDIDATES; PHYSICAL-PROPERTIES; DYNAMICAL COLLAPSE; DENSITY STRUCTURE; STELLAR CLUSTERS; EARLIEST PHASES Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43982