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REVISING THE KINEMATICS OF 12 GHz CH3OH MASERS TOWARD W3(OH)
Moscadelli, L.1; Xu, Y.2; Chen, X.3
2010-06-20
Source PublicationASTROPHYSICAL JOURNAL
Volume716Issue:2Pages:1356-1370
AbstractWe 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.
Keywordh Ii Regions Ism: Individual Objects (W3(Oh)) Ism: Kinematics And Dynamics Masers Techniques: Interferometric
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/716/2/1356
WOS KeywordHIGH-SPECTRAL-RESOLUTION ; YOUNG STELLAR OBJECTS ; METHANOL MASERS ; OH MASERS ; PROPER MOTIONS ; DISC
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000278459000037
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15950
Collection紫金山天文台青海观测站
Affiliation1.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
Recommended Citation
GB/T 7714
Moscadelli, L.,Xu, Y.,Chen, X.. REVISING THE KINEMATICS OF 12 GHz CH3OH MASERS TOWARD W3(OH)[J]. ASTROPHYSICAL JOURNAL,2010,716(2):1356-1370.
APA Moscadelli, L.,Xu, Y.,&Chen, X..(2010).REVISING THE KINEMATICS OF 12 GHz CH3OH MASERS TOWARD W3(OH).ASTROPHYSICAL JOURNAL,716(2),1356-1370.
MLA Moscadelli, L.,et al."REVISING THE KINEMATICS OF 12 GHz CH3OH MASERS TOWARD W3(OH)".ASTROPHYSICAL JOURNAL 716.2(2010):1356-1370.
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