Universität zu Köln

Nguyen-Luong, Q., Motte, F., Carlhoff, P., Louvet, F., Lesaffre, P., Schilke, P., Hill, T., Hennemann, M., Gusdorf, A., Didelon, P., Schneider, N., Bontemps, S., Duarte-Cabral, A., Menten, K. M., Martin, P. G., Wyrowski, F., Bendo, G., Roussel, H., Bernard, J. -P., Bronfman, L., Henning, T., Kramer, C. and Heitsch, F. (2013). LOW-VELOCITY SHOCKS TRACED BY EXTENDED SiO EMISSION ALONG THE W43 RIDGES: WITNESSING THE FORMATION OF YOUNG MASSIVE CLUSTERS. Astrophys. J., 775 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

The formation of high-mass stars is tightly linked to that of their parental clouds. Here, we focus on the high-density parts of W43, a molecular cloud undergoing an efficient event of star formation. Using a column density image derived from Herschel continuum maps, we identify two high-density filamentary clouds, called the W43-MM1 and W43-MM2 ridges. Both have gas masses of 2.1 x 10(4) M-circle dot and 3.5 x 10(4) M-circle dot above > 10(23) cm(-2) and within areas of similar to 6 and similar to 14 pc(2), respectively. The W43-MM1 and W43-MM2 ridges are structures that are coherent in velocity and gravitationally bound, despite their large velocity dispersion measured by the N2H+ (1-0) lines of the W43-HERO IRAM large program. Another intriguing result is that these ridges harbor widespread (similar to 10 pc(2)) bright SiO (2-1) emission, which we interpret to be the result of low-velocity shocks (<= 10 km s(-1)). We measure a significant relationship between the SiO (2-1) luminosity and velocity extent and show that it distinguishes our observations from the high-velocity shocks associated with outflows. We use state-of-the-art shock models to demonstrate that a small percentage (10%) of Si atoms in low-velocity shocks, observed initially in gas phase or in grain mantles, can explain the observed SiO column density in the W43 ridges. The spatial and velocity overlaps between the ridges of high-density gas and the shocked SiO gas suggest that ridges could be forming via colliding flows driven by gravity and accompanied by low-velocity shocks. This mechanism may be the initial conditions for the formation of young massive clusters.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Nguyen-Luong, Q. UNSPECIFIED UNSPECIFIED UNSPECIFIED Motte, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Carlhoff, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Louvet, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lesaffre, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hill, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hennemann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gusdorf, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Didelon, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bontemps, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duarte-Cabral, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, K. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Martin, P. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wyrowski, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bendo, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roussel, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bernard, J. -P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bronfman, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henning, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kramer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heitsch, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-475267
DOI:	10.1088/0004-637X/775/2/88
Journal or Publication Title:	Astrophys. J.
Volume:	775
Number:	2
Date:	2013
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR CLOUD FORMATION; INFRARED DARK CLOUD; INTERSTELLAR GAS LAYERS; STAR-FORMATION; GALACTIC-CENTER; LINE SURVEY; GRAVITATIONAL COLLAPSE; MINI-STARBURST; HERSCHEL VIEW; DENSE CLOUDS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47526