Journal
ASTROPHYSICAL JOURNAL
Volume 705, Issue 2, Pages 1548-1553Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/705/2/1548
Keywords
astrometry; Galaxy: fundamental parameters; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: structure; stars: formation
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Funding
- Chinese National Science Foundation [10673024, 10733030, 10703010, 10621303]
- NBPRC [2007CB815403]
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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.
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