论文标题
Blazar S5 0716+714的光谱监测：亮度依赖性光谱行为
Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-Dependent Spectral Behavior
论文作者
论文摘要
在本文中，我们报告了从2019年9月至2020年3月的$γ$ -Ray Blazar S5 0716+714的光谱观察结果的新结果，Yunnan observatories的Lijiang观测值2.4 M光学望远镜。观测的中值节奏为$ \ sim $ 1天。在第二个观察期（Epoch2）中，观察数据显示出极明亮的状态和蓝光（BWB）染色体的蓝色状态。 EPOCH2的BWB趋势与第一个观察期（Epoch1）的趋势明显不同。 Epoch1和Epoch2的总数据中出现了显着依赖亮度的BWB染色性。 BWB趋势在更明亮的状态下变得较弱，并且在最高状态下可能变得饱和。 Based on a log-parabolic function, a power-law of synchrotron peak flux and frequency $ν_{\rm{p}}$, and a power-law of the curvature of synchrotron spectrum and its $ν_{\rm{p}}$, simulation well reproduces the brightness-dependent BWB trend of S5 0716+714. BWB趋势似乎是由相对于观测窗口的$ν_ {\ rm {p}} $的移位控制的，并且有效地可能由发射区域中电子平均能量和磁场的变化主导。
In this paper, we report the new results of spectroscopic observations of $γ$-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is $\sim$ 1 day. During the second observation period (Epoch2), the observational data reveal an extremely bright state and a bluer-when-brighter (BWB) chromatism. The BWB trend of Epoch2 differs significantly from that of the first observation period (Epoch1). A significantly brightness-dependent BWB chromatism emerges in the total data of Epoch1 and Epoch2. The BWB trend becomes weaker towards the brighter states, and likely becomes saturated at the highest state. Based on a log-parabolic function, a power-law of synchrotron peak flux and frequency $ν_{\rm{p}}$, and a power-law of the curvature of synchrotron spectrum and its $ν_{\rm{p}}$, simulation well reproduces the brightness-dependent BWB trend of S5 0716+714. The BWB trend is seemingly controlled by the shift of $ν_{\rm{p}}$ with respect to the observational window, and effectively may be dominated by the variations of electron average energy and magnetic field in emitting region.
