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VERA Observations of the H2O Maser Burst in Orion KL

Published online by Cambridge University Press:  24 July 2012

Tomoya Hirota ,
Masato Tsuboi ,
Kenta Fujisawa ,
Mareki Honma ,
Noriyuki Kawaguchi ,
Mi Kyoung Kim ,
Hideyuki Kobayashi ,
Hiroshi Imai ,
Toshihiro Omodaka  and
Katsunori M. Shibata
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Tomoya Hirota
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan email: tomoya.hirota@nao.ac.jp Department of Astronomical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Mitaka, Tokyo 181-8588, Japan
Masato Tsuboi
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8510, Japan
Kenta Fujisawa
Affiliation:
Faculty of Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8512, Japan
Mareki Honma
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan email: tomoya.hirota@nao.ac.jp Department of Astronomical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Mitaka, Tokyo 181-8588, Japan
Noriyuki Kawaguchi
Affiliation:
Department of Astronomical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Mitaka, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, Oshu, Iwate 023-0861, Japan
Mi Kyoung Kim
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan email: tomoya.hirota@nao.ac.jp
Hideyuki Kobayashi
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan email: tomoya.hirota@nao.ac.jp Department of Astronomical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Mitaka, Tokyo 181-8588, Japan
Hiroshi Imai
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, Kagoshima, Kagoshima 890-0065, Japan
Toshihiro Omodaka
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, Kagoshima, Kagoshima 890-0065, Japan
Katsunori M. Shibata
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan email: tomoya.hirota@nao.ac.jp Department of Astronomical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Mitaka, Tokyo 181-8588, Japan
Tomomi Shimoikura
Affiliation:
Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
Yoshinori Yonekura
Affiliation:
Center for Astronomy, Ibaraki University, Mito, Ibaraki 310-8512, Japan
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Abstract

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In 2011 February, a burst of the 22 GHz H2O maser in Orion KL was reported. In order to identify the bursting maser features, we have been carrying out observations of the 22 GHz H2O maser in Orion KL with VERA, a Japanese VLBI network dedicated for astrometry. The bursting maser turns out to consist of two spatially different features at 7.58 and 6.95 km s−1. We determine their absolute positions and find that they are coincident with the shocked molecular gas called the Orion Compact Ridge. We tentatively detect the absolute proper motions of the bursting features toward the southwest direction, perpendicular to the elongation of the maser features. It is most likely that the outflow from the radio source I or another young stellar object interacting with Compact Ridge is a possible origin of the H2O maser burst. We will also carry out observations with ALMA in the cycle 0 period to monitor the submillimeter H2O maser lines in the Orion Compact Ridge region. These follow-up observations will provide novel information on the physical and chemical properties of the mastering region.

Keywords

masersISM: individual (Orion KL)ISM: jets and outflowsradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 103 - 107
Copyright
Copyright © International Astronomical Union 2012

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