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题名: REVISING THE KINEMATICS OF 12 GHz CH3OH MASERS TOWARD W3(OH)
作者: Moscadelli, L.1; Xu Ye(徐烨)2; Chen, X.3
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2010-06-20
卷号: 716, 期号:2, 页码:1356-1370
关键词: H II regions ; ISM: individual objects (W3(OH)) ; ISM: kinematics and dynamics ; masers ; techniques: interferometric
DOI: 10.1088/0004-637X/716/2/1356
文章类型: Article
英文摘要: We derive accurate proper motions of the CH3OH 12 GHz masers toward the W3(OH) ultra-compact (UC) H II region, employing seven epochs of VLBA observations spanning a time interval of about 10 yr. The achieved velocity accuracy is of the order of 0.1 km s(-1), adequate to precisely measure the relative velocities of most of the 12 GHz masers in W3(OH), with amplitude varying in the range 0.3-3 km s(-1). Toward W3(OH), the most intense 12 GHz masers concentrate in a small area toward the north (the northern clump) of the UC H II region. We have compared the proper motions of the CH3OH 12 GHz masers with those (derived from literature data) of the OH 6035 MHz masers, emitting from the same region of the methanol masers. In the northern clump, the two maser emissions emerge from nearby (but likely distinct) cloudlets of masing gas with, in general, a rather smooth variation of line-of-sight and sky-projected velocities, which suggests some connection of the environments and kinematics traced by both maser types. The conical outflow model, previously proposed to account for the 12 GHz maser kinematics in the northern clump, does not reproduce the new, accurate measurements of 12 GHz maser proper motions and has to be rejected. We focus on the subset of 12 GHz masers of the northern clump belonging to the "linear structure at P.A. = 130 degrees-140 degrees," whose regular variation of LSR velocities with position presents evidence for some ordered motion. We show that the three-dimensional velocities of this " linear distribution" of 12 GHz masers can be well fitted considering a flat, rotating disk, seen almost edge-on.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: HIGH-SPECTRAL-RESOLUTION ; YOUNG STELLAR OBJECTS ; METHANOL MASERS ; OH MASERS ; PROPER MOTIONS ; DISC
收录类别: SCI
语种: 英语
WOS记录号: WOS:000278459000037
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15950
Appears in Collections:紫金山天文台青海观测站_期刊论文

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作者单位: 1.Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
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