Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-12-28
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
8 pages, 6 figures, accepted for publication in PASJ (VERA 2rd special issue)
Scientific paper
We conducted the astrometry of H2O masers in the Galactic star-forming region Onsala 1 (ON1) with VLBI Exploration of Radio Astrometry (VERA). We measured a trigonometric parallax of 0.404+/-0.017 mas, corresponding to a distance of 2.47+/-0.11 kpc. ON1 is appeared to be located near the tangent point at the Galactic longitude of 69.54 deg. We estimate the angular velocity of the Galactic rotation at Sun, the ratio of the distance from Sun to the Galactic center and the Galactic rotation velocity at Sun, to be 28.7+/-1.3 km/s/kpc using the measured distance and proper motion of ON1. This value is larger than the IAU recommended value of 25.9 km/s/kpc, but consistent with other results recently obtained with the VLBI technique.
Handa Toshihiro
Honma Mareki
Kawaguchi Noriyuki
Kobayashi Hideyuki
Miyaji Takeshi
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