Universität zu Köln

Qin, Sheng-Li, Schilke, Peter ORCID: 0000-0003-2141-5689, Wu, Jingwen, Liu, Tie ORCID: 0000-0002-5286-2564, Wu, Yuefang, Sanchez-Monge, Alvaro and Liu, Ying (2016). SMA observations of the W3(OH) complex: Dynamical differentiation between W3(H2O) and W3(OH). Mon. Not. Roy. Astron. Soc., 456 (3). S. 2681 - 2692. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We present Submillimeter Array observations of the HCN (3-2) and HCO+ (3-2) molecular lines towards the W3(H2O) and W3(OH) star-forming complexes. Infall and outflow motions in the W3(H2O) have been characterized by observing HCN and HCO+ transitions. Highvelocity blue/red-shifted emission, tracing the outflow, show multiple knots, which might originate in episodic and precessing outflows. 'Blue-peaked' line profiles indicate that gas is infalling on to the W3(H2O) dust core. The measured large mass accretion rate, 2.3 x 10(-3) M-circle dot yr(-1), together with the small free-fall time-scale, 5 x 10(3) yr, suggest W3(H2O) is in an early evolutionary stage of the process of formation of high-mass stars. For the W3(OH), a two-layer model fit to the HCN and HCO+ spectral lines and Spizter/Infrared Array Camera (IRAC) images support that the W3(OH) H II region is expanding and interacting with the ambient gas, with the shocked neutral gas being expanding with an expansion time-scale of 6.4 x 10(3) yr. The observations suggest different kinematical time-scales and dynamical states for the W3(H2O) and W3(OH).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Qin, Sheng-Li UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, Peter UNSPECIFIED orcid.org/0000-0003-2141-5689 UNSPECIFIED Wu, Jingwen UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Tie UNSPECIFIED orcid.org/0000-0002-5286-2564 UNSPECIFIED Wu, Yuefang UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, Alvaro UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Ying UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-283945
DOI:	10.1093/mnras/stv2801
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	456
Number:	3
Page Range:	S. 2681 - 2692
Date:	2016
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MASSIVE STAR-FORMATION; H-II REGIONS; LINE-PROFILES; MOLECULAR OUTFLOWS; GRAVITATIONAL COLLAPSE; MOTIONS; CORE; DISCOVERY; INFALL; INFLOW Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28394