Universität zu Köln

Louvet, F., Motte, F., Gusdorf, A., Lu'o'ng, Q. Nguyen, Lesaffre, P., Duarte-Cabral, A., Maury, A., Schneider, N., Hill, T., Schilke, P. and Gueth, F. (2016). Tracing extended low-velocity shocks through SiO emission Case study of the W43-MM1 ridge. Astron. Astrophys., 595. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Aims. Previous literature suggests that the densest structures in the interstellar medium form through colliding flows, but patent evidence of this process is still missing. Recent literature proposes using SiO line emission to trace low-velocity shocks associated with cloud formation through collision. In this paper we investigate the bright and extended SiO(2 1) emission observed along the similar to 5 pc-long W43-MM1 ridge to determine its origin. Methods. We used high angular resolution images of the SiO(2 1) and HCN(1 0) emission lines obtained with the IRAM plateau de Bure (PdBI) interferometer and combined with data from the IRAM 30m radiotelescope. These data were complemented by a Herschel column density map of the region. We performed spectral analysis of SiO and HCN emission line profiles to identify protostellar outflows and spatially disentangle two velocity components associated with low-and high-velocity shocks. Then, we compared the low-velocity shock component to a dedicated grid of one-dimensional (1D) radiative shock models. Results. We find that the SiO emission originates from a mixture of high-velocity shocks caused by bipolar outflows and low-velocity shocks. Using SiO and HCN emission lines, we extract seven bipolar outflows associated with massive dense cores previously identified within the W43-MM1 mini-starburst cluster. Comparing observations with dedicated Paris-Durham shock models constrains the velocity of the low-velocity shock component from 7 to 12 km s(-1). Conclusions. The SiO arising from low-velocity shocks spreads along the complete length of the ridge. Its contribution represents at least 45% and up to 100% of the total SiO emission depending on the area considered. The low-velocity component of SiO is most likely associated with the ridge formation through colliding flows or cloud-cloud collision.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Louvet, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Motte, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gusdorf, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lu'o'ng, Q. Nguyen UNSPECIFIED UNSPECIFIED UNSPECIFIED Lesaffre, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duarte-Cabral, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maury, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hill, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gueth, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-257615
DOI:	10.1051/0004-6361/201629077
Journal or Publication Title:	Astron. Astrophys.
Volume:	595
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 STAR-FORMATION; INTERSTELLAR JETS; MOLECULAR CLOUDS; MAGNETIC-FIELDS; CO-OBSERVATIONS; LINE EMISSION; COMPLEX; PHOTODESORPTION; REGIONS; GRAINS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25761