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Galactic rotation measurements based on H2O maser astrometry with VERA

Published online by Cambridge University Press:  01 March 2007

Mareki Honma
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588
Takeshi Bushimata
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Space VLBI Project, NAOJ, Mitaka, Tokyo 181-8588
Yoon Kyung Choi
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-8654
Tomoya Hirota
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan
Hiroshi Imai
Affiliation:
Faculty of Science, Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065
Kenzaburo Iwadate
Affiliation:
Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Takaaki Jike
Affiliation:
Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Osamu Kameya
Affiliation:
Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588 Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Ryuichi Kamohara
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan
Yukitoshi Kan-ya
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Department of Astronomy, Yonsei University, Seoul, 120-749, Republic of Korea
Noriyuki Kawaguchi
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588
Masachika Kijima
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588
Hideyuki Kobayashi
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Space VLBI Project, NAOJ, Mitaka, Tokyo 181-8588 Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-8654 Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Seisuke Kuji
Affiliation:
Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Tomoharu Kurayama
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan
Seiji Manabe
Affiliation:
Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588 Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Takeshi Miyaji
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Space VLBI Project, NAOJ, Mitaka, Tokyo 181-8588
Takumi Nagayama
Affiliation:
Faculty of Science, Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065
Akiharu Nakagawa
Affiliation:
Faculty of Science, Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065
Chung Sik Oh
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-8654
Toshihiro Omodaka
Affiliation:
Faculty of Science, Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065
Tomoaki Oyama
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan
Satoshi Sakai
Affiliation:
Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Katsuhisa Sato
Affiliation:
Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Tetsuo Sasao
Affiliation:
Ajou University, Suwon 442-749, Republic of Korea Korean VLBI Network, KASI, Seoul, 120-749, Republic of Korea
Katsunori M. Shibata
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Space VLBI Project, NAOJ, Mitaka, Tokyo 181-8588
Motonobu Shintani
Affiliation:
Faculty of Science, Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065
Hiroshi Suda
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-8654 Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Yoshiaki Tamura
Affiliation:
Mizusawa VERA observatory, NAOJ, Mizusawa, 023-0861, JAPAN
Miyuki Tsushima
Affiliation:
Faculty of Science, Kagoshima University, Korimoto, Kagoshima, Kagoshima 890-0065
Kazuyoshi Yamashita
Affiliation:
Mizusawa VERA Observatory, NAOJ, Mitaka, 181-8588 Tokyo, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588
Corresponding
E-mail address:
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Abstract

We present results of astrometric observations of S269 H2O maser performed with VERA (VLBI Exploration of Radio Astrometry). We have monitored the positions of S269 H2O masers for 1 year and successfully detected its parallax to be 189±8 micro-arcsecond. This corresponds to a source distance of 5.28+0.24−0.22 kpc, and is the smallest parallax (and thus the largest distance) that has ever been measured by means of annual parallax. Proper motions of S269 H2O maser were also measured and used to determine the Galactic rotation velocity at the position of S269. Our measurements show that the Galactic rotation velocity at S269 is the same to that at the Sun within 3%, indicating that the Galactic rotation curve is flat out to R~13 kpc.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

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Galactic rotation measurements based on H2O maser astrometry with VERA
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Galactic rotation measurements based on H2O maser astrometry with VERA
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