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题名: MUSCLE W49: A MULTI-SCALE CONTINUUM AND LINE EXPLORATION OF THE MOST LUMINOUS STAR FORMATION REGION IN THE MILKY WAY. I. DATA AND THE MASS STRUCTURE OF THE GIANT MOLECULAR CLOUD
作者: Galvan-Madrid, R.1; Liu, H. B.2; Zhang, Z-Y3, 4; Pineda, J. E.1, 5, 6; Peng, T-C1; Zhang, Q.7; Keto, E. R.7; Ho, P. T. P.2, 7; Rodriguez, L. F.8, 9; Zapata, L.8; Peters, T.10; De Pree, C. G.11
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2013-12-20
卷号: 779, 期号:2
关键词: galaxies: starburst ; galaxies: star clusters: general ; H II regions ; ISM: clouds ; ISM: individual objects (W49A, W49N, W49S, W49SW) ; open clusters and associations: general ; stars: formation ; stars: massive
DOI: 10.1088/0004-637X/779/2/121
文章类型: Article
英文摘要: The Multi-scale Continuum and Line Exploration of W49 is a comprehensive gas and dust survey of the giant molecular cloud (GMC) of W49A, the most luminous star-formation region in the Milky Way. The project covers, for the first time, the entire GMC at different scales and angular resolutions. In this paper, we present (1) an all-configuration Submillimeter Array mosaic in the 230 GHz (1.3 mm) band covering the central similar to 3' x 3' (similar to 10 pc, known as W49N), where most of the embedded massive stars reside and (2) Purple Mountain Observatory 14 m telescope observations in the 90 GHz band, covering the entire GMC with maps of up to similar to 35' x 35' in size, or similar to 113 pc. We also make use of archival data from the Very Large Array, JCMT-SCUBA, the IRAM 30 m telescope, and the Caltech Submillimeter Observatory BOLOCAM Galactic Plane Survey. We derive the basic physical parameters of the GMC at all scales. Our main findings are as follows. (1) The W49 GMC is one of the most massive in the Galaxy, with a total mass M-gas similar to 1.1 x 10(6) M-circle dot within a radius of 60 pc. Within a radius of 6 pc, the total gas mass is M-gas similar to 2 x 10(5) M-circle dot. At these scales, only similar to 1% of the material is photoionized. The mass reservoir is sufficient to form several young massive clusters (YMCs) as massive as a globular cluster. (2) The mass of the GMC is distributed in a hierarchical network of filaments. At scales <10 pc, a triple, centrally condensed structure peaks toward the ring of HC H II regions in W49N. This structure extends to scales from similar to 10 to 100 pc through filaments that radially converge toward W49N and its less-prominent neighbor W49S. The W49A starburst most likely formed from global gravitational contraction with localized collapse in a "hub-filament" geometry. (3) Currently, feedback from the central YMCs (with a present mass M-cl greater than or similar to 5 x 10(4) M-circle dot) is still not enough to entirely disrupt the GMC, but further stellar mass growth could be enough to allow radiation pressure to clear the cloud and halt star formation. (4) The resulting stellar content will probably remain as a gravitationally bound massive star cluster or a small system of bound clusters.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: H-II REGIONS ; FAR-INFRARED OBSERVATIONS ; ULTRACOMPACT HII-REGIONS ; FREE-FALL TIME ; STELLAR CLUSTERS ; FORMING REGIONS ; INTERSTELLAR-MEDIUM ; RADIATION-PRESSURE ; GLOBULAR-CLUSTERS ; MAGNETIC-FIELDS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000328187200031
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15524
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.European So Observ, D-85748 Garching, Germany
2.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan
3.Max Planck Inst Radioastron, D-53121 Bonn, Germany
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
5.Univ Manchester, Jodrell Bank Ctr Astrophys, Sch Phys & Astron, UK ARC Node, Manchester M13 9PL, Lancs, England
6.ETH, Inst Astron, CH-8093 Zurich, Switzerland
7.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
8.UNAM, Ctr Radioastron & Astrofis, Morelia 58089, Michoacan, Mexico
9.King Abdulaziz Univ, Dept Astron, Fac Sci, Jeddah 21589, Saudi Arabia
10.Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland
11.Agnes Scott Coll, Dept Phys & Astron, Decatur, GA 30030 USA
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