A TRIGONOMETRIC PARALLAX OF Sgr B2

被引：179

作者：

Reid, M. J. ^{[1
]}

Menten, K. M. ^{[2
]}

Zheng, X. W. ^{[3
]}

Brunthaler, A. ^{[2
]}

Xu, Y. ^{[4
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[3] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China

[4] Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 705卷 / 02期

基金：

美国国家科学基金会;

关键词：

astrometry; Galaxy: fundamental parameters; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: structure; stars: formation; SAGITTARIUS-A-ASTERISK; STAR-FORMING REGION; GALACTIC-CENTER; HUBBLE CONSTANT; STELLAR ORBITS; PROPER MOTION; BLACK-HOLE; H2O MASERS; MILKY-WAY; DISTANCE;

D O I：

10.1088/0004-637X/705/2/1548

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured the positions of H(2)O masers in Sgr B2, a massive star-forming region in the Galactic center, relative to an extragalactic radio source with the Very Long Baseline Array. The positions measured at 12 epochs over a time span of one year yield the trigonometric parallax of Sgr B2 and hence a distance to the Galactic center of R(0) = 7.9(-0.7)(+0.8) kpc. The proper motion of Sgr B2 relative to Sgr A* suggests that Sgr B2 is approximate to 0.13 kpc nearer than the Galactic center, assuming a low-eccentricity Galactic orbit.

引用

页码：1548 / 1553

页数：6

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