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VERA observations of the Galactic star-forming regions ON1 and ON2N

Published online by Cambridge University Press:  26 February 2013

Takumi Nagayama  and
VERA project members
Takumi Nagayama
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan email: takumi.nagayama@nao.ac.jp
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Abstract

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We carried out astrometric observations with VERA of H2O masers in ON1 and ON2N. The measured distances to ON1 and ON2N are 2.47 ± 0.11 and 3.83 ± 0.13 kpc, respectively. We found that ON1 and ON2N are located near the tangent point and the Solar circle, respectively. We derive an angular velocity of the Galactic rotation at the Sun's position (i.e. the ratio of the Galactic constants) of 28 ± 2 km s−1 kpc−1 using the measured distances and three-dimensional velocity components of the two sources. This value is consistent with recent estimates obtained using Very Long Baseline Interferometry but different from the IAU-recommended value of 25.9 km s−1 kpc−1.

Keywords

astrometryGalaxy: fundamental parametersGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 418 - 421
Copyright
Copyright © International Astronomical Union 2013

References

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