The First VERA Astrometry Catalog

Abstract

We present the first astrometry catalog from the Japanese VLBI (very long baseline interferometer) project VERA (VLBI Exploration of Radio Astrometry). We have compiled all the astrometry results from VERA, providing accurate trigonometric annual parallax and proper motion measurements. In total, 99 maser sources are listed in the VERA catalog. Among them, 21 maser sources are newly reported while the rest of 78 sources are referred to previously published results or those in preparation for forthcoming papers. The accuracy in the VERA astrometry are revisited and compared with those from the other VLBI astrometry projects such as BeSSeL (The Bar and Spiral Structure Legacy) Survey and GOBELINS (the Gould's Belt Distances Survey) with the VLBA (Very Long Baseline Array). We have confirmed that most of the astrometry results are consistent with each other, and the largest error sources are due to source structure of the maser features and their rapid variation, along with the systematic calibration errors and different analysis methods. Combined with the BeSSeL results, we estimate the up-to-date fundamental Galactic parameter of $R_0=7.92\pm 0.16_{stat.}\pm 0.3_{sys.}$~kpc and ${\Omega }_{\odot }=30.17\pm 0.27_{stat.}\pm 0.3_{sys.}$~km~s${}^{-1}$~kpc${}^{-1}$, where $R_0$ and ${\Omega }_{\odot }$ are the distance from the Sun to the Galactic center and the Sun's angular velocity of the Galactic circular rotation, respectively.

35 pages, 7 figures, accepted for publication in the Publications of the Astronomical Society of Japan

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