Follow-up observations for IceCube-170922A: Detection of rapid near-infrared variability and intensive monitoring of TXS 0506+056
Follow-up observations for IceCube-170922A: Detection of rapid near-infrared variability and intensive monitoring of TXS 0506+056
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DOI：
10.1093/pasj/psaa110
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
T. Morokuma;Y. Utsumi;K. Ohta;M. Yamanaka;K. Kawabata;Y. Inoue;Masaomi Tanaka;Michitoshi Yoshida;R. Itoh;M. Sasada;N. Tominaga;Hiroki Mori;M. Kawabata;T. Nakaoka;Maiko Chogi;T. Abe;Ruochen Huang;N. Kawahara;Hiroki Kimura;H. Nagashima;K. Takagi;Y. Yamazaki;Wei Liu;R. Ohsawa;S. Sako;K. Murata;K. Morihana;C. Gilligan;K. Isogai;M. Kimura;Yasuyuki Wakamatsu;Ryuhei Ohnishi;M. Takayama;S. Honda;Y. Matsuoka;T. Yamashita;S. Nagataki;Yasuyuki T. Tanaka
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文献类型：
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作者：
T. Morokuma;Y. Utsumi;K. Ohta;M. Yamanaka;K. Kawabata;Y. Inoue;Masaomi Tanaka;Michitoshi Yoshida;R. Itoh;M. Sasada;N. Tominaga;Hiroki Mori;M. Kawabata;T. Nakaoka;Maiko Chogi;T. Abe;Ruochen Huang;N. Kawahara;Hiroki Kimura;H. Nagashima;K. Takagi;Y. Yamazaki;Wei Liu;R. Ohsawa;S. Sako;K. Murata;K. Morihana;C. Gilligan;K. Isogai;M. Kimura;Yasuyuki Wakamatsu;Ryuhei Ohnishi;M. Takayama;S. Honda;Y. Matsuoka;T. Yamashita;S. Nagataki;Yasuyuki T. Tanaka
我们提出了我们的后续观测，以寻找一个电磁对应的冰立方高能中微子，冰立方-170922A。还描述了可能的对应物TXS 0506+056的监测观测结果。首先，我们在中微子探测之后迅速拍摄了IceCube误差区域内7个平谱射电源的光学和近红外图像，并在金田/HONIR J波段数据中发现了TXS 0506+056的快速通量下降。在这一发现的推动下，我们对TXS 0506+056进行了持续的跟踪观测，包括我们的监测成像观测，光谱观测以及光学和近红外波长的偏振观测。TXS 0506+056在几天或更长的时间尺度内显示出大幅度（~1.0 mag）的变异性，尽管在一天或更短的时间尺度内未检测到显著变异性。TXS 0506+056在光学和近红外波长上也显示出越蓝越亮的趋势。对光变结构函数的分析表明，TXS 0506+056不是一个特殊的耀变体。对TXS 0506+056的偏振测量结果进行了讨论.
We present our follow-up observations to search for an electromagnetic counterpart of the IceCube high-energy neutrino, IceCube-170922A. Monitoring observations of a likely counterpart, TXS 0506+056, are also described. First, we quickly took optical and near-infrared images of 7 flat-spectrum radio sources within the IceCube error region right after the neutrino detection and found a rapid flux decline of TXS 0506+056 in Kanata/HONIR J-band data. Motivated by this discovery, intensive follow-up observations of TXS 0506+056 are continuously done, including our monitoring imaging observations, spectroscopic observations, and polarimetric observations in optical and near-infrared wavelengths. TXS 0506+056 shows a large amplitude (~1.0 mag) variability in a time scale of several days or longer, although no significant variability is detected in a time scale of a day or shorter. TXS 0506+056 also shows a bluer-when-brighter trend in optical and near-infrared wavelengths. Structure functions of variabilities are examined and indicate that TXS 0506+056 is not a special blazar in terms of optical variability. Polarization measurement results of TXS 0506+056 are also discussed.