VERA Observation of the W49NH2O Maser Outburst in 2003 October
VERA Observation of the W49NH2O Maser Outburst in 2003 October
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DOI：
10.1093/pasj/56.3.l15
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发表时间：
2004-05
影响因子：
2.3
通讯作者：
M. Honma;Y. Choi;T. Bushimata;T. Fujii;T. Hirota;K. Horiai;H. Imai;N. Inomata;J. Ishitsuka;K. Iwadate;T. Jike;O. Kameya;R. Kamohara;Y. Kan-ya;N. Kawaguchi;H. Kobayashi;S. Kuji;T. Kurayama;S. Manabe;T. Miyaji;A. Nakagawa;K. Nakashima;R. Nagayoshi;T. Omodaká;T. Oyama;M. Rioja;S. Sakai;S. Sakakibara;K. Sato;T. Sasao;K. Shibata;R. Shimizu;K. Sora;H. Suda;Y. Tamura;K. Yamashita
中科院分区：
文献类型：
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作者：
M. Honma;Y. Choi;T. Bushimata;T. Fujii;T. Hirota;K. Horiai;H. Imai;N. Inomata;J. Ishitsuka;K. Iwadate;T. Jike;O. Kameya;R. Kamohara;Y. Kan-ya;N. Kawaguchi;H. Kobayashi;S. Kuji;T. Kurayama;S. Manabe;T. Miyaji;A. Nakagawa;K. Nakashima;R. Nagayoshi;T. Omodaká;T. Oyama;M. Rioja;S. Sakai;S. Sakakibara;K. Sato;T. Sasao;K. Shibata;R. Shimizu;K. Sora;H. Suda;Y. Tamura;K. Yamashita
本文报道了用VERA观测到的W49NH2O脉泽的一次强爆发。2003年10月，用VERA 20米望远镜进行的单碟监测发现了一次VLSR = − 30.7 kms −1的脉泽特征的强烈爆发。该次爆发持续时间约100天，峰值强度为7.9 × 104Jy，是迄今为止在W49N观测到的最强爆发之一。在爆发的最大相位附近也进行了VERA阵的VLBI观测，并在VLBI图上确定了爆发点。虽然这张图与以前的研究很好地吻合，显示了三个主要的脉泽点集中，但我们在中央脉泽集中区发现了一个新形成的弧形结构，这可能是由形成中的星星或星星团提供动力的激波阵面。发现爆发点位于弧形结构上，表明本次爆发可能与冲击现象有关。
We report on a strong outburst of the W 49N H2O maser observed with VERA. Single-dish monitoring with VERA 20m telescopes detected a strong outburst of the maser feature at VLSR = −30.7kms −1 in 2003 October. The outburst had a duration of ∼ 100 days and a peak intensity of 7.9 ×10 4 Jy, being one of the strongest outbursts in W 49N observed so far. VLBI observations with the VERA array were also carried out near to the maximum phase of the outburst, and the outburst spot was identified in the VLBI map. While the map was in good agreement with previous studies, showing three major concentrations of maser spots, we found a newly formed arc-like structure in the central maser concentration, which may be a shock front powered by a forming star or a star cluster. The outburst spot was found to be located on the arc-like structure, indicating a possible connection of the present outburst to a shock phenomenon.