Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-02-25
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
6 pages, 3 figures. 'Highlight talk' held at the Meeting of the Astronomische Gesellschaft (2010). To be published in Reviews
Scientific paper
Astrometric Very Long Baseline Interferometry (VLBI) observations of maser sources in the Milky Way are used to map the spiral structure of our Galaxy and to determine fundamental parameters such as the rotation velocity ($\Theta_0$) and curve and the distance to the Galactic center (R$_0$). Here, we present an update on our first results, implementing a recent change in the knowledge about the Solar motion. It seems unavoidable that the IAU recommended values for R$_0$ and $\Theta_0$ need a substantial revision. In particular the combination of 8.5 kpc and 220 \kms\, can be ruled out with high confidence. Combining the maser data with the distance to the Galactic center from stellar orbits and the proper motion of Sgr\,A* gives best values of R$_0$ = 8.3 $\pm$ 0.23 kpc and $\Theta_0$ = 239 or 246 $\pm$ 7 \kms, for Solar motions of V$_ \odot$ = 12.23 and 5.25 \kms, respectively. Finally, we give an outlook to future observations in the Bar and Spiral Structure Legacy (BeSSeL) Survey.
Bartkiewicz Anna
Brunthaler Andreas
Choi Yoon K.
Dame Tom
Hachisuka Kazuya
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