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题名: DISCOVERY OF AN EXTREMELY WIDE-ANGLE BIPOLAR OUTFLOW IN AFGL 5142
作者: Liu, Tie1; Zhang, Qizhou2; Kim, Kee-Tae1; Wu, Yuefang3; Lee, Chang-Won1, 4; Goldsmith, Paul F.5; Li, Di6, 7; Liu, Sheng-Yuan8; Chen, Huei-Ru8, 9, 10; Tatematsu, Ken'ichi11; Wang, Ke12; Lee, Jeong-Eun13; Qin, Sheng-Li14, 15; Mardones, Diego16; Cho, Se-Hyung1
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-06-10
卷号: 824, 期号:1
关键词: ISM: jets and outflows ; ISM: kinematics and dynamics ; stars: formation
DOI: 10.3847/0004-637X/824/1/31
文章类型: Article
英文摘要: Most bipolar outflows are associated with individual young stellar objects and have small opening angles. Here we report the discovery of an extremely wide-angle (similar to 180 degrees) bipolar outflow ("EWBO") in a cluster forming region AFGL 5142 from low-velocity emission of the HCN (3-2) and HCO+ (3-2) lines. This bipolar outflow is along a north-west to south-east direction with a line of sight flow velocity of about 3 km s(-1) and is spatially connected to the high-velocity jet-like outflows. It seems to be a collection of low-velocity material entrained by the high-velocity outflows due to momentum feedback. The total ejected mass and mass loss rate due to both high-velocity jet-like outflows and the "EWBO" are similar to 24.5 M-circle dot and similar to 1.7 x 10(-3)M(circle dot) yr(-1), respectively. Global collapse of the clump is revealed by the " blue profile" in the HCO+ (1-0) line. A hierarchical network of filaments was identified in NH3 (1, 1) emission. Clear velocity gradients of the order of 10 km s(-1) pc(-1) are found along filaments, indicating gas inflow along the filaments. The sum of the accretion rate along filaments and mass infall rate along the line of sight is similar to 3.1 x 10(-3) M-circle dot yr(-1), which exceeds the total mass loss rate, indicating that the central cluster is probably still gaining mass. The central cluster is highly fragmented and 22 condensations are identified in 1.1 mm continuum emission. The fragmentation process seems to be determined by thermal pressure and turbulence. The magnetic field may not play an important role in fragmentation.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STAR CLUSTER FORMATION ; FORMING CORE W3-SE ; MOLECULAR OUTFLOWS ; PROTOSTELLAR CANDIDATES ; HIGH-VELOCITY ; HOT CORE ; INFALL ; FRAGMENTATION ; ACCRETION ; FEEDBACK
收录类别: SCI
项目资助者: Chinese Academy of Sciences(XDB09000000) ; Science and Technology Facilities Council of the United Kingdom ; KASI fellowship ; China Ministry of Science and Technology under State Key Development Program for Basic Research(2012CB821800) ; NSFC(11373009 ; Top Talents Program of Yunnan Province(2015HA030) ; ESO fellowship ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology(NRF-2013R1A1A2A10005125) ; global research collaboration of Korea Research Council of Fundamental Science & Technology (KRCF) ; Basic Science Research Program through the National Research Foundation of Korea (NRF)(NRF-2015R1A2A2A01004769) ; Korea Astronomy and Space Science Institute under the RD program(2015-1-320-18) ; 11433008 ; 11373026 ; 11433004)
语种: 英语
WOS记录号: WOS:000377937300031
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16239
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 305348, South Korea
2.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
4.Univ Sci & Technol, 217 Gajungro, Daejeon 305333, South Korea
5.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
6.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
7.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
8.Acad Sinica, Inst Astron & Astrophys, Taipei 115, Taiwan
9.Natl Tsing Hua Univ, Inst Astron, Hsinchu, Taiwan
10.Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan
11.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
12.European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
13.Kyung Hee Univ, Sch Space Res, Yongin 446701, Gyeonggi Do, South Korea
14.Yunnan Univ, Dept Astron, Kunming 650091, Peoples R China
15.Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Peoples R China
16.Univ Chile, Dept Astron, Casilla 36-D, Santiago, Chile
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