Universität zu Köln

Louvet, F., Motte, F., Hennebelle, P., Maury, A., Bonnell, I., Bontemps, S., Gusdorf, A., Hill, T., Gueth, F., Peretto, N., Duarte-Cabral, A., Stephan, G., Schilke, P., Csengeri, T., Luong, Q. Nguyen and Lis, D. C. (2014). The W43-MM1 mini-starburst ridge, a test for star formation efficiency models. Astron. Astrophys., 570. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Star formation efficiency (SFE) theories are currently based on statistical distributions of turbulent cloud structures and a simple model of star formation from cores. They remain poorly tested, especially at the highest densities. Aims. We investigate the effects of gas density on the SFE through measurements of the core formation efficiency (CFE). With a total mass of similar to 2 x 10(4) M-circle dot, the W43-MM1 ridge is one of the most convincing candidate precursors of Galactic starburst clusters and thus one of the best places to investigate star formation. Methods. We used high-angular resolution maps obtained at 3 mm and 1 mm within the W43-MM1 ridge with the IRAM Plateau de Bure Interferometer to reveal a cluster of 11 massive dense cores, and, one of the most massive protostellar cores known. A Herschel column density image provided the mass distribution of the cloud gas. We then measured the instantaneous CFE and estimated the SFE and the star formation rate (SFR) within subregions of the W43-MM1 ridge. Results. The high SFE found in the ridge (similar to 6% enclosed in similar to 8 pc(3)) confirms its ability to form a starburst cluster. There is, however, a clear lack of dense cores in the eastern part of the ridge, which may be currently assembling. The CFE and the SFE are observed to increase with volume gas density, while the SFR per free fall time steeply decreases with the virial parameter, alpha(vir). Statistical models of the SFR may describe the outskirts of the W43-MM1 ridge well, but struggle to reproduce its inner part, which corresponds to measurements at low alpha(vir). It may be that ridges do not follow the log-normal density distribution, Larson relations, and stationary conditions forced in the statistical SFR models.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Louvet, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Motte, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hennebelle, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maury, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonnell, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bontemps, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gusdorf, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hill, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gueth, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peretto, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duarte-Cabral, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stephan, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Csengeri, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luong, Q. Nguyen UNSPECIFIED UNSPECIFIED UNSPECIFIED Lis, D. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-427831
DOI:	10.1051/0004-6361/201423603
Journal or Publication Title:	Astron. Astrophys.
Volume:	570
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 INITIAL HIGHLIGHTS; MASSIVE PROTOSTARS; MOLECULAR-COMPLEX; PRESTELLAR CORES; EARLIEST PHASES; MAGNETIC-FIELDS; FORMATION RATES; HERSCHEL; CLOUDS; CONTINUUM Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42783