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Astrometry of H2O maser sources in nearby molecular clouds with VERA

Published online by Cambridge University Press:  01 March 2007

Tomoya Hirota
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan
Takeshi Bushimata
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Yoon Kyung Choi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Mareki Honma
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan
Hiroshi Imai
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Kenzaburo Iwadate
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Takaaki Jike
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Seiji Kameno
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Osamu Kameya
Affiliation:
Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Ryuichi Kamohara
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Yukitoshi Kan-ya
Affiliation:
Yonsei University, Seoul 120-749, Republic of Korea
Noriyuki Kawaguchi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan
Masachika Kijima
Affiliation:
Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan
Mi Kyoung Kim
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Hideyuki Kobayashi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Seisuke Kuji
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Tomoharu Kurayama
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Seiji Manabe
Affiliation:
Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Kenta Maruyama
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Makoto Matsui
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Naoko Matsumoto
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Takeshi Miyaji
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Takumi Nagayama
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Akiharu Nakagawa
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Kayoko Nakamura
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Chung Sik Oh
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Toshihiro Omodaka
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Tomoaki Oyama
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Satoshi Sakai
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Tetsuo Sasao
Affiliation:
Ajou University, Suwon 443-749, Republic of Korea Korean VLBI Network, Seoul 120-749, Republic of Korea
Katsuhisa Sato
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Mayumi Sato
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Katsunori M. Shibata
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan
Motonobu Shintani
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Yoshiaki Tamura
Affiliation:
Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Miyuki Tsushima
Affiliation:
Kagoshima University, Kagoshima 890-0065, Japan
Kazuyoshi Yamashita
Affiliation:
Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan
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Abstract

We have carried out multi-epoch VLBI observations of the H2O maser sources associated with young stellar objects (YSOs) in nearby molecular clouds with VERA (VLBI Exploration of Radio Astrometry), which is a newly constructed VLBI network in Japan (Kobayashi et al. 2003). The main goal of our study is to measure the absolute proper motions and distances to nearby molecular clouds within 1 kpc from the Sun, to reveal their 3-dimensional structures and dynamical properties. Using the VERA dual-beam receiving system (Honma et al. 2003), we have carried out phase-referencing VLBI observations and measured annual parallaxes and absolute proper motions of the H2O maser features with respect to the extragalactic radio sources. We have successfully detected the annual parallax of one of the H2O maser features in Orion KL to be 2.29±0.10 mas, corresponding to the distance of 437±19 pc from the Sun (Hirota et al. 2007). In addition, the annual parallax of SVS13 in NGC 1333 is also determined to be4.10±0.17 mas, corresponding to the distance of 244±10 pc from the Sun, although the life time of the maser features are only 6 months. The absolute proper motions of the H2O maser features associated with Orion KL and NGC 1333 are derived, possibly indicating the outflow motions from the YSOs as well as the systemic motions of the powering sources.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Hirota, T. et al. 2007, submitted to PASJGoogle Scholar
Honma, M. et al. 2003, PASJ, 55, L57CrossRefGoogle Scholar
Kobayashi, H. et al. 2003, in: Minh, Y. C. (eds.), New technologies in VLBI, ASP Conf. Ser. (San Francisco: ASP), vol. 306, p. 367Google Scholar
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Astrometry of H2O maser sources in nearby molecular clouds with VERA
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