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ON THE NATURE OF THE LOCAL SPIRAL ARM OF THE MILKY WAY
Xu, Y.1; Li, J. J.1,2; Reid, M. J.3; Menten, K. M.2; Zheng, X. W.4; Brunthaler, A.2; Moscadelli, L.5; Dame, T. M.3; Zhang, B.2
2013-05-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume769Issue:1Pages:0
Corresponding AuthorXu, Y (reprint author), Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China. Email: xuye@pmo.ac.cn
AbstractTrigonometric parallax measurements of nine water masers associated with the Local Arm of the Milky Way were carried out as part of the BeSSeL Survey using the Very Long Baseline Array. When combined with 21 other parallax measurements from the literature, the data allow us to study the distribution and three-dimensional motions of star forming regions in the spiral arm over the entire northern sky. Our results suggest that the Local Arm does not have the large pitch angle characteristic of a short spur. Instead its active star formation, overall length (> 5 kpc), and shallow pitch angle (similar to 10 degrees) suggest that it is more like the adjacent Perseus and Sagittarius Arms; perhaps it is a branch of one of these arms. Contrary to previous results, we find the Local Arm to be closer to the Perseus than to the Sagittarius Arm, suggesting that a branching from the former may be more likely. An average peculiar motion of near zero toward both the Galactic center and north Galactic pole, and counter rotation of similar to 5 km s(-1) were observed, indicating that the Local Arm has similar kinematic properties as found for other major spiral arms.
KeywordAstrometry - Galaxy Kinematics And Dynamics - Masers - Stars Formation - Techniques High Angular Resolution
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/769/1/15
WOS KeywordSTAR-FORMING REGIONS ; H-II REGIONS ; ULTRACOMPACT HII-REGIONS ; BASE-LINE INTERFEROMETRY ; VLBA CALIBRATOR SURVEY ; YOUNG STELLAR OBJECTS ; LUMINOUS IRAS SOURCES ; H2O MASERS ; TRIGONOMETRIC PARALLAXES ; MOLECULAR CLOUDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000319904500015
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9770
Collection暗物质和空间天文实验室
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Max Planck Inst Radioastron, D-53121 Bonn, Germany
3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
4.Nanjing Univ, Nanjing 20093, Jiangsu, Peoples R China
5.INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy
Recommended Citation
GB/T 7714
Xu, Y.,Li, J. J.,Reid, M. J.,et al. ON THE NATURE OF THE LOCAL SPIRAL ARM OF THE MILKY WAY[J]. ASTROPHYSICAL JOURNAL,2013,769(1):0.
APA Xu, Y..,Li, J. J..,Reid, M. J..,Menten, K. M..,Zheng, X. W..,...&Zhang, B..(2013).ON THE NATURE OF THE LOCAL SPIRAL ARM OF THE MILKY WAY.ASTROPHYSICAL JOURNAL,769(1),0.
MLA Xu, Y.,et al."ON THE NATURE OF THE LOCAL SPIRAL ARM OF THE MILKY WAY".ASTROPHYSICAL JOURNAL 769.1(2013):0.
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