耀变体S5 0716+714多波段光学变率特性的几何解释
A geometrical interpretation for the properties of multiband optical variability of the blazar S5 0716+714
摘要：
我们介绍了在2014年4月至2015年4月期间的23个夜晚对blazar S5 0716+714夜间变化进行多波段观测的结果。在夜间和夜间数据中都检测到了更亮时更蓝的趋势。我们假设穿过介质变得对光辐射透明的区域的射流分量形成几乎所有的S5 0716+714的光发射。部件的某些部分与部件的总体轨迹的偏差可能导致这些部分的多普勒因子增加。通过这些部件实现的各种最大多普勒因子以及它们与凹面同步加速器自吸收光谱所占据的不同体积导致观察到的各种颜色指数行为的变化，并解释了蓝时亮行为对物体大小的依赖性。我们估计频谱最大频率$ν_\text{m}\approx\left( 0.6-1.7\right)\cdot10^{14}$赫兹内和夜间数据。假设发射区的大小与$5\cdot10^8$太阳质量黑洞的引力半径相当，由同步辐射自吸收得到的磁场为$B\sim10^2-10^4$ G，与其它独立估计值相对应.获得的$ν_\text{m}$和$B$值证实了我们关于耀变体S5 0716+714在光学范围内辐射的性质的假设。
英文摘要：
We present the results of multiband observations of the blazar S5 0716+714 intra-night variability performed during 23 nights in the period from 04.2014 through 04.2015. The bluer-when-brighter trend is detected in both intra- and inter-night data. We assume that the jet component crossing the region where the medium becomes transparent to the optical radiation forms almost all optical emission of S5 0716+714. Deviations of some parts of the component from the general trajectory of the component can cause the Doppler factor of these parts to increase. Various maximum Doppler factors achieved by these parts of the component and different volumes occupied by them with the concave synchrotron self-absorption spectrum result in both the observed various color index behavior in variability and explain the absence of dependence of the bluer-when-brighter behavior on the object magnitude. We estimated spectral maximum frequency $ν_\text{m}\approx\left( 0.6-1.7\right)\cdot10^{14}$ Hz from intra- and inter-night data. Assuming that the size of emitting region is comparable with the gravitational radius of a black hole with a mass of $5\cdot10^8$ solar masses, the magnetic field obtained from synchrotron self-absorption is $B\sim10^2-10^4$ G, which corresponds to the values of other independent estimations. The obtained values of $ν_\text{m}$ and $B$ confirm our assumption about the nature of the blazar S5 0716+714 region radiating in the optical range.
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