Absolute Proper Motions of H2O Masers Away from the Galactic Plane Measured with VERA in the “Superbubble” Region NGC 281
Absolute Proper Motions of H2O Masers Away from the Galactic Plane Measured with VERA in the “Superbubble” Region NGC 281
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DOI：
10.1093/pasj/59.4.743
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发表时间：
2007-04
影响因子：
2.3
通讯作者：
M. Sato;T. Hirota;M. Honma;H. Kobayashi;T. Sasao;T. Bushimata;Y. Choi;H. Imai;K. Iwadate;T. Jike;S. Kameno;O. Kameya;R. Kamohara;Y. Kan-ya;N. Kawaguchi;Masachika Kijima;Mi Kyoung Kim;S. Kuji;T. Kurayama;S. Manabe;K. Maruyama;M. Matsui;N. Matsumoto;T. Miyaji;T. Nagayama;A. Nakagawa;K. Nakamura;C. Oh;T. Omodaká;T. Oyama;S. Sakai;Katsuhisa Sato;K. Shibata;M. Shintani;Y. Tamura;M. Tsushima;K. Yamashita
中科院分区：
文献类型：
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作者：
M. Sato;T. Hirota;M. Honma;H. Kobayashi;T. Sasao;T. Bushimata;Y. Choi;H. Imai;K. Iwadate;T. Jike;S. Kameno;O. Kameya;R. Kamohara;Y. Kan-ya;N. Kawaguchi;Masachika Kijima;Mi Kyoung Kim;S. Kuji;T. Kurayama;S. Manabe;K. Maruyama;M. Matsui;N. Matsumoto;T. Miyaji;T. Nagayama;A. Nakagawa;K. Nakamura;C. Oh;T. Omodaká;T. Oyama;S. Sakai;Katsuhisa Sato;K. Shibata;M. Shintani;Y. Tamura;M. Tsushima;K. Yamashita
本文报道了NGC 281 Westmolecular云中H2 O脉泽源的绝对自行测量结果。该源位于银道面上方10320 pc处，与从银道面延伸出来的H I环有关。自2006年5月起，我们利用VLBI射电天体测量探测仪（VERA）对该脉泽源进行了为期6个月的多历元相位参考观测。我们发现NGC 281 West中的H2 O脉泽特征正以2.2 - 3.5kpc的垂直速度向西南方向有系统地移动，并进一步远离银道面。我们的新结果提供了最直接的证据，表明在H I环上的NGC 281区域的气体是从银河平面吹出的，最有可能是在银河平面上的多个或连续的超新星爆炸驱动的超级气泡中。关键词：银河系：运动学和动力学- ISM：气泡- ISM：H II区域- ISM：单个（NGC 281）-脉泽（H 2
AbstractWe report on absolute proper-motion measurements of an H 2 O maser source in the NGC 281 Westmolecular cloud, which is located ∼320 pc above the Galactic plane and is associated with an H I loopextending from the Galactic plane. We have conducted multi-epoch phase-referencing observations of themaser source with VERA (VLBI Exploration of Radio Astrometry) over a monitoring period of 6 monthssince May 2006. We find that the H 2 O maser features in NGC 281 West are systematically moving towardthe southwest and further away from the Galactic plane with a vertical velocity of ∼20−30 km s −1 at itsestimated distance of 2.2−3.5 kpc. Our new results provide the most direct evidence that the gas in theNGC 281 region on the H I loop was blown out from the Galactic plane, most likely in a superbubble drivenby multiple or sequential supernova explosions in the Galactic plane.Keywords:Galaxy: kinematics and dynamics — ISM: bubbles — ISM: H II regions — ISM: individual(NGC 281) — masers (H 2