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TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE SCUTUM SPIRAL ARM
Sato, M.1; Wu, Y. W.1,2,3; Immer, K.1; Zhang, B.1; Sanna, A.1; Reid, M. J.4; Dame, T. M.4; Brunthaler, A.1; Menten, K. M.1
2014-10-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume793Issue:2Pages:0
AbstractWe report measurements of trigonometric parallaxes for six high-mass star-forming regions in the Scutum spiral arm of the Milky Way as part of the BeSSeL Survey. Combining our measurements with 10 previous measurements from the BeSSeL Survey yields a total sample of 16 sources in the Scutum arm with trigonometric parallaxes in the Galactic longitude range from 5 degrees to 32 degrees. Assuming a logarithmic spiral model, we estimate a pitch angle of 19 degrees.8 +/- 3 degrees.1 for the Scutum arm, which is larger than pitch angles reported for other spiral arms. The high pitch angle of the arm may be due to the arm's proximity to the Galactic bar. The Scutum arm sources show an average peculiar motion of 4 km s(-1) slower than the Galactic rotation and 8 km s(-1) toward the Galactic center. While the direction of this non-circular motion has the same sign as determined for sources in other spiral arms, the motion toward the Galactic center is greater for the Scutum arm sources.
KeywordAstrometry Galaxy: Kinematics And Dynamics Galaxy: Structure Masers Parallaxes Stars: Formation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/793/2/72
WOS KeywordULTRACOMPACT HII-REGIONS ; EXTENDED GREEN OBJECTS ; 1ST GALACTIC QUADRANT ; GHZ METHANOL MASERS ; MILKY-WAY GALAXY ; H-II REGIONS ; MOLECULAR CLOUDS ; FUNDAMENTAL PARAMETERS ; NEUTRAL HYDROGEN ; VLBI ASTROMETRY
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000341965300003
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Cited Times:46[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10713
Collection紫金山天文台青海观测站
Affiliation1.Max Planck Inst Radioastron, D-53121 Bonn, Germany
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
Recommended Citation
GB/T 7714
Sato, M.,Wu, Y. W.,Immer, K.,et al. TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE SCUTUM SPIRAL ARM[J]. ASTROPHYSICAL JOURNAL,2014,793(2):0.
APA Sato, M..,Wu, Y. W..,Immer, K..,Zhang, B..,Sanna, A..,...&Menten, K. M..(2014).TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE SCUTUM SPIRAL ARM.ASTROPHYSICAL JOURNAL,793(2),0.
MLA Sato, M.,et al."TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE SCUTUM SPIRAL ARM".ASTROPHYSICAL JOURNAL 793.2(2014):0.
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