Long-term monitoring of Sgr A* at 7 mm with VERA and KaVA

Long-term monitoring of Sgr A* at 7 mm with VERA and KaVA
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使用 VERA 和 KaVA 在 7 毫米处长期监测 Sgr A*

DOI:
10.1017/s1743921314000751
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发表时间:
2014
期刊:
Proceedings of the International Astronomical Union
影响因子:
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通讯作者:
M.
M.
中科院分区:
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文献类型:
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作者:
Akiyama;K. ; Kino;M. ; Sohn;B. ; Lee;S. ; Trippe;S. ; Honma;M.

文献摘要

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本文给出了利用VLBI射电天体测量探测系统(VERA)在7毫米(即43 GHz)对SGR A*进行的射电监测观测结果。VERA提供毫秒尺度的角度分辨率,分辨SgrA*的100 Schwarzschild半径内的结构,类似于超大型基线阵列(VLBA)。我们在2005-2008年对SGR A*进行了多纪元观测,并从2013年1月开始使用VERA再次对其进行监测,以追踪当前的G2相遇事件。我们2013年的初步结果显示,截至2013年8月,大尺度上的星云A*一直处于正常状态,尽管G2云的一部分在2013年4月已经通过了星云A*的中心附近。我们将继续用VERA和新开发的KAVA(KVN和VERA阵列)监测中士A*。
We present the results of radio monitoring observations of Sgr A* at 7 mm (i.e. 43 GHz) with the VLBI Exploration of Radio Astrometry (VERA), which is a VLBI array in Japan. VERA provides angular resolution on millisecond scales, resolving structures within 100 Schwarzschild radii of Sgr A* , similar to the Very Large Baseline Array (VLBA). We performed multi-epoch observations of Sgr A* in 2005 - 2008, and started monitoring it again with VERA from 2013 January to trace the current G2 encounter event. Our preliminary results in 2013 show that Sgr A* on mas scales has been in an ordinary state as of August 2013, although some fraction of the G2 cloud already passed the pericenter of Sgr A* in April 2013. We will continue monitoring Sgr A* with VERA and the newly developed KaVA (KVN and VERA Array).