Universität zu Köln

Andre, Ph., Reveret, V., Koenyves, V., Arzoumanian, D., Tige, J., Gallais, P., Roussel, H., Le Pennec, J., Rodriguez, L., Doumayrou, E., Dubreuil, D., Lortholary, M., Martignac, J., Talvard, M., Delisle, C., Visticot, F., Dumaye, L., De Breuck, C., Shimajiri, Y., Motte, F., Bontemps, S., Hennemann, M., Zavagno, A., Russeil, D., Schneider, N., Palmeirim, P., Peretto, N., Hill, T., Minier, V., Roy, A. and Rygl, K. L. J. (2016). Characterizing filaments in regions of high-mass star formation: High-resolution submilimeter imaging of the massive star-forming complex NGC 6334 with ArTeMiS. Astron. Astrophys., 592. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Herschel observations of nearby molecular clouds suggest that interstellar filaments and prestellar cores represent two fundamental steps in the star formation process. The observations support a picture of low-mass star formation according to which filaments of similar to 0.1 pc width form first in the cold interstellar medium, probably as a result of large-scale compression of interstellar matter by supersonic turbulent flows, and then prestellar cores arise from gravitational fragmentation of the densest filaments. Whether this scenario also applies to regions of high-mass star formation is an open question, in part because the resolution of Herschel is insufficient to resolve the inner width of filaments in the nearest regions of massive star formation. Aims. In an effort to characterize the inner width of filaments in high-mass star-forming regions, we imaged the central part of the NGC 6334 complex at a resolution higher by a factor of >3 than Herschel at 350 mu m. Methods. We used the large-format bolometer camera ArTeMiS on the APEX telescope and combined the high-resolution ArTEMiS data at 350 mu m with Herschel/HOBYS data at 70500 mu m to ensure good sensitivity to a broad range of spatial scales. This allowed us to study the structure of the main narrow filament of the complex with a resolution of 8 '' or <0.07 pc at d similar to 1.7 kpc. Results. Our study confirms that this filament is a very dense, massive linear structure with a line mass ranging from similar to 500 M-circle dot/pc to similar to 2000 M-circle dot/pc over nearly 10 pc. It also demonstrates for the first time that its inner width remains as narrow as W similar to 0.15 +/- 0.05 pc all along the filament length, within a factor of <2 of the characteristic 0.1 pc value found with Herschel for lower-mass filaments in the Gould Belt. Conclusions. While it is not completely clear whether the NGC 6334 filament will form massive stars in the future, it is two to three orders of magnitude denser than the majority of filaments observed in Gould Belt clouds, and has a very similar inner width. This points to a common physical mechanism for setting the filament width and suggests that some important structural properties of nearby clouds also hold in high-mass star-forming regions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Andre, Ph. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reveret, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koenyves, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Arzoumanian, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tige, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gallais, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roussel, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Le Pennec, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rodriguez, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Doumayrou, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dubreuil, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lortholary, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Martignac, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Talvard, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Delisle, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Visticot, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dumaye, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED De Breuck, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shimajiri, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Motte, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bontemps, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hennemann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zavagno, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Russeil, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palmeirim, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peretto, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hill, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Minier, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roy, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rygl, K. L. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-267276
DOI:	10.1051/0004-6361/201628378
Journal or Publication Title:	Astron. Astrophys.
Volume:	592
Date:	2016
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 GOULD BELT SURVEY; INTERSTELLAR FILAMENTS; MOLECULAR CLOUDS; FORMATION EFFICIENCY; INITIAL HIGHLIGHTS; PRESTELLAR CORES; GLOBAL COLLAPSE; HERSCHEL VIEW; DENSE CORES; MILKY-WAY Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26727