论文标题
中微子发射Blazar的中微子观察，TXS 0506+056
Medium-band observation of the neutrino emitting blazar, TXS 0506+056
论文作者
论文摘要
TXS 0506+056是一种大黄花，最近被确定为中微子事件ICECUBE-170922A的对应物。了解TXS 0506+056的Blazar类型对于限制中微子发射机制很重要，但是TXS 0506+056的Blazar性质仍然不确定。为了了解TXS 0506+056的性质，我们报告了TXS 0506+056的中型观察结果，覆盖了0.575至1.025 $μ$ m的波长范围。中型滤清器的使用使我们能够检查一个月内的光谱形状是否存在任何显着变化，并更好地限制了与准平方数据集的同步辐射的峰值频率。发现峰值频率为$ 10^{14.28} $ Hz，我们的分析表明，TXS 0506+056与Blazar序列的异常相交不是。为了确定大黄体类型的一种方式，我们还分析了TXS 0506+056是Blueer-wher-brighter（BL LAC类型和某些Flat Spectrum Radiodrum Radio darsors，fsrqs），或者是红色企业时（仅在某些FSRQ中发现）。即使我们在中型观察期内检测到比观察误差大的光谱形状的显着变化，但与2012年所采用的数据集的比较表明，当FSRQ的抗变红行为可能是红色的。我们的结果表明，具有小到中等大小的望远镜的中型波段观测可以是追踪瞬态频谱演化（例如TXS 0506+056）的有效方法。
TXS 0506+056 is a blazar that has been recently identified as the counterpart of the neutrino event IceCube-170922A. Understanding blazar type of TXS 0506+056 is important to constrain the neutrino emission mechanism, but the blazar nature of TXS 0506+056 is still uncertain. As an attempt to understand the nature of TXS 0506+056, we report the medium-band observation results of TXS 0506+056, covering the wavelength range of 0.575 to 1.025 $μ$m. The use of the medium-band filters allow us to examine if there were any significant changes in its spectral shapes over the course of one month and give a better constraint on the peak frequency of synchrotron radiation with quasi-simultaneous datasets. The peak frequency is found to be $10^{14.28}$ Hz, and our analysis shows that TXS 0506+056 is not an outlier from the blazar sequence. As a way to determine the blazar type, we also analyzed if TXS 0506+056 is bluer-when-brighter (BL Lac type and some flat spectrum radio quasars, FSRQs) or redder-when-brighter (found only in some FSRQs). Even though we detect no significant variability in the spectral shape larger than observational error during our medium-band observation period, the comparison with a dataset taken at 2012 shows a possible redder-when-brighter behavior of FSRQs. Our results demonstrate that medium-band observations with small to moderate-sized telescopes can be an effective way to trace the spectral evolution of transients such as TXS 0506+056.
