DISCOVERY OF AN EXTREMELY WIDE-ANGLE BIPOLAR OUTFLOW IN AFGL 5142
文献类型：期刊论文
| 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 |
| 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 |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000377937300031 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/16239]  |
| 专题 | 紫金山天文台_太阳活动的多波段观测研究团组 |
| 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 |
| 推荐引用方式 GB/T 7714 | Liu, Tie,Zhang, Qizhou,Kim, Kee-Tae,et al. DISCOVERY OF AN EXTREMELY WIDE-ANGLE BIPOLAR OUTFLOW IN AFGL 5142[J]. ASTROPHYSICAL JOURNAL,2016,824(1). |
| APA | Liu, Tie.,Zhang, Qizhou.,Kim, Kee-Tae.,Wu, Yuefang.,Lee, Chang-Won.,...&Cho, Se-Hyung.(2016).DISCOVERY OF AN EXTREMELY WIDE-ANGLE BIPOLAR OUTFLOW IN AFGL 5142.ASTROPHYSICAL JOURNAL,824(1). |
| MLA | Liu, Tie,et al."DISCOVERY OF AN EXTREMELY WIDE-ANGLE BIPOLAR OUTFLOW IN AFGL 5142".ASTROPHYSICAL JOURNAL 824.1(2016). |
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来源：紫金山天文台
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