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Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm
Wu, Y. W.1,2,3; Sato, M.2; Reid, M. J.4; Moscadelli, L.5; Zhang, B.2; Xu, Y.1; Brunthaler, A.2; Menten, K. M.2; Dame, T. M.4; Zheng, X. W.6
2014-06-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume566Issue:0Pages:0
AbstractWe report measurements of parallaxes and proper motions of ten high-mass star-forming regions in the Sagittarius spiral arm of the Milky Way as part of the BeSSeL Survey with the VLBA. Combining these results with eight others from the literature, we investigated the structure and kinematics of the arm between Galactocentric azimuths beta approximate to -2 degrees. and 65 degrees. We found that the spiral pitch angle is 7 degrees.3 +/- 1 degrees.5; the arm's half-width, defined as the rms deviation from the fitted spiral, is approximate to 0.2 kpc; and the nearest portion of the Sagittarius arm is 1.4 +/- 0.2 kpc from the Sun. Unlike for adjacent spiral arms, we found no evidence for significant peculiar motions of sources in the Sagittarius arm opposite to Galactic rotation.
KeywordAstrometry Galaxy: Structure Galaxy: Kinematics And Dynamics Masers Stars: Formation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361/201322765
WOS KeywordII METHANOL MASERS ; GIANT MOLECULAR CLOUD ; MILKY-WAY ; WATER MASER ; FUNDAMENTAL PARAMETERS ; GALACTIC ROTATION ; VLBI ASTROMETRY ; INFRARED SURVEY ; BESSEL SURVEY ; IRAS SOURCES
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000338681500036
Citation statistics
Cited Times:75[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10715
Collection紫金山天文台青海观测站
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Max Planck Inst Radioastron, D-53121 Bonn, Germany
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
5.Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy
6.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wu, Y. W.,Sato, M.,Reid, M. J.,et al. Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm[J]. ASTRONOMY & ASTROPHYSICS,2014,566(0):0.
APA Wu, Y. W..,Sato, M..,Reid, M. J..,Moscadelli, L..,Zhang, B..,...&Zheng, X. W..(2014).Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm.ASTRONOMY & ASTROPHYSICS,566(0),0.
MLA Wu, Y. W.,et al."Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm".ASTRONOMY & ASTROPHYSICS 566.0(2014):0.
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