论文标题
ICECUBE-170922A的后续观察：检测快速近红外变异性和TXS 0506+056的密集监测
Follow-up Observations for IceCube-170922A: Detection of Rapid Near-Infrared Variability and Intensive Monitoring of TXS 0506+056
论文作者
论文摘要
我们提出了我们的后续观察，以搜索Icecube高能中微子的电磁对应物，即IceCube-170922a。还描述了可能对应物TXS 0506+056的监测观察结果。首先，我们迅速拍摄了中微子检测后的Icecube误差区域内7个扁平光谱无线电源的光学和近红外图像，并发现Kanata/Honir J波段数据中TXS 0506+056的通量迅速下降。在这一发现的激励下，连续完成TXS 0506+056的密集随访观察结果，包括我们的监测成像观测值，光谱观察结果以及光学和近膜波长中的极化观测值。 TXS 0506+056在几天或更长时间的时间范围内显示出较大的振幅（〜1.0 mag）变异性，尽管在一天或较短的时间范围内未检测到明显的可变性。 TXS 0506+056还显示了光学和近红外波长中的蓝光趋势。检查了变异性的结构函数，并表明TXS 0506+056在光学变异性方面不是特殊的Blazar。还讨论了TXS 0506+056的极化测量结果。
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.
