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Maser Astrometry and Galactic Structure Study with VLBI

Published online by Cambridge University Press:  16 July 2018

Mareki Honma
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan email: mareki.honma@nao.ac.jp Dept. of Astronomical Science, SOKENDAI, 023-0861, Iwate, Japan
Takumi Nagayama
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Tomoya Hirota
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan Dept. of Astronomical Science, SOKENDAI, 023-0861, Iwate, Japan
Nobuyuki Sakai
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Tomoaki Oyama
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Aya Yamauchi
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Toshiaki Ishikawa
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Toshihiro Handa
Affiliation:
Dept. of Physics, Kagoshima University, 890-8580, Kagoshima, Japan
Ken Hirano
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Hiroshi Imai
Affiliation:
Dept. of Physics, Kagoshima University, 890-8580, Kagoshima, Japan
Takaaki Jike
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Osamu Kameya
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan Dept. of Astronomical Science, SOKENDAI, 023-0861, Iwate, Japan
Yusuke Kono
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Hideyuki Kobayashi
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Akiharu Nakagawa
Affiliation:
Dept. of Astronomical Science, SOKENDAI, 023-0861, Iwate, Japan
Katsunori M. Shibata
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan Dept. of Astronomical Science, SOKENDAI, 023-0861, Iwate, Japan
Daisuke Sakai
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan Dept. of Astronomy, the University of Tokyo, 113-8654, Tokyo, Japan
Kazuyoshi Sunada
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Koichiro Sugiyama
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Katsuhisa Sato
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Toshihiro Omodaka
Affiliation:
Dept. of Physics, Kagoshima University, 890-8580, Kagoshima, Japan
Yoshiaki Tamura
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
Yuji Ueno
Affiliation:
National Astronomical Observatory of Japan, 023-0861, Iwate, Japan
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Abstract

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In this proceeding paper, we introduce the recent results of Galactic maser astrometry by mainly focusing on those obtained with Japanese VLBI array VERA. So far we have obtained parallaxes for 86 sources including preliminary results, and combination with the data obtained with VLBA/BeSSeL provides astrometric results for 159 sources. With these most updated results we conduct preliminary determinations of Galactic fundamental parameters, obtaining R0 = 8.16 ± 0.26 kpc and Θ0 = 237 ± 8 km/s. We also derive the rotation curve of the Milky Way Galaxy and confirm the previous results that the rotation curve is fairly flat between 5 kpc and 16 kpc, while a remarkable deviation is seen toward the Galactic center region. In addition to the results on the Galactic structure, we also present brief overviews on other science topics related to masers conducted with VERA, and also discuss the future prospect of the project.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

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