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TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. IX. THE OUTER ARM IN THE FIRST QUADRANT
Sanna, A.1; Reid, M. J.2; Dame, T. M.2; Menten, K. M.1; Brunthaler, A.1; Moscadelli, L.3; Zheng, X. W.4; Xu, Y.5
2012-01-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume745Issue:1Pages:82(7pp)
AbstractWe report a trigonometric parallax measurement with the Very Long Baseline Array for the water maser in the distant high-mass star-forming region G75.30+1.32. This source has a heliocentric distance of 9.25(-0.40)(+0.45) kpc, which places it in the Outer arm in the first Galactic quadrant. It lies 200 pc above the Galactic plane and is associated with a substantial H i enhancement at the border of a large molecular cloud. At a Galactocentric radius of 10.7 kpc, G75.30+1.32 is in a region of the Galaxy where the disk is significantly warped toward the North Galactic Pole. While the star-forming region has an instantaneous Galactic orbit that is nearly circular, it displays a significant motion of 18 km s(-1) toward the Galactic plane. The present results, when combined with two previous maser studies in the Outer arm, yield a pitch angle of about 12 degrees for a large section of the arm extending from the first quadrant to the third.
KeywordAstrometry Galaxy: Fundamental Parameters Galaxy: Kinematics And Dynamics Masers Stars: Formation Techniques: High Angular Resolution
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/745/1/82
WOS KeywordMILKY-WAY-GALAXY ; SPIRAL ARMS ; MOLECULAR CLOUDS ; VELOCITY-FIELD ; 3-DIMENSIONAL DISTRIBUTION ; PERIODIC PATTERN ; DISK ; KINEMATICS ; ASTROMETRY ; DISTANCES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000300316600082
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8116
Collection紫金山天文台青海观测站
Affiliation1.Max Planck Inst Radioastron, D-53121 Bonn, Germany
2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
3.Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy
4.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Sanna, A.,Reid, M. J.,Dame, T. M.,et al. TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. IX. THE OUTER ARM IN THE FIRST QUADRANT[J]. ASTROPHYSICAL JOURNAL,2012,745(1):82(7pp).
APA Sanna, A..,Reid, M. J..,Dame, T. M..,Menten, K. M..,Brunthaler, A..,...&Xu, Y..(2012).TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. IX. THE OUTER ARM IN THE FIRST QUADRANT.ASTROPHYSICAL JOURNAL,745(1),82(7pp).
MLA Sanna, A.,et al."TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. IX. THE OUTER ARM IN THE FIRST QUADRANT".ASTROPHYSICAL JOURNAL 745.1(2012):82(7pp).
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