TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE SCUTUM SPIRAL ARM

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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
刊名	ASTROPHYSICAL JOURNAL
	2014-10-01
卷号	793 期号:2 页码:0
关键词	astrometry Galaxy: kinematics and dynamics Galaxy: structure masers parallaxes stars: formation
ISSN号	0004-637X
英文摘要	We 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.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ULTRACOMPACT 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
收录类别	SCI
原文出处	10.1088/0004-637X/793/2/72
语种	英语
WOS记录号	WOS:000341965300003
公开日期	2014-11-21
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/10713]
专题	紫金山天文台_紫金山天文台青海观测站
作者单位	1.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
推荐引用方式 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.