与S5 0716和$ + $ 714中最短时间尺度变化相关的偏振变化的探测
Detection of Polarimetric Variations Associated with the Shortest Time-Scale Variability in S5 0716$ + $714
摘要：
本文介绍了用卡纳塔望远镜对BL Lac天体S5 0716 $ + $ 714进行的近红外和光学观测结果。$ + $ 714具有长期高幅度变化性和夜间的短期变化性。最短的可变性（微可变性）时间尺度对于理解射流和磁场的几何形状是重要的，因为它提供了可能的最小尺寸的变化源。在这里，我们报告的检测15分钟的变化在S5 0716 $ + $ 714，这是一个最短的时间尺度的光学和近红外变化观测耀变体。检测到的微变在$V$带中具有$0.061{\pm}0.005$ mag的振幅和$Δ(V-J)=-0.025{\pm}0.011$的蓝色。此外，我们成功地检测到一个前所未有的，短时间尺度的偏振变化与亮度的变化。我们发现，微变化有一个特定的偏振分量。变化分量的偏振度大于总通量的偏振度。这些结果表明，微变起源于一个小的和局部的区域，其中的磁场是对齐的。
英文摘要：
We present the result of near-infrared and optical observations of the BL Lac object S5 0716$ + $714 carried out by the KANATA telescope. S5 0716$ + $714 has both a long term high-amplitude variability and a short-term variability within a night. The shortest variability (microvariability) time-scale is important for understanding the geometry of jets and magnetic field, because it provides a possible minimum size of variation sources. Here, we report the detection of 15-min variability in S5 0716$ + $714, which is one of the shortest time-scales in optical and near-infrared variations observed in blazars. The detected microvariation had an amplitude of $0.061{\pm}0.005$ mag in $V$ band and a blue color of $Δ(V-J)=-0.025{\pm}0.011$. Furthermore, we successfully detected an unprecedented, short time-scale polarimetric variation which correlated with the brightness change. We revealed that the microvariation had a specific polarization component. The polarization degree of the variation component was higher than that of the total flux. These results suggest that the microvariability originated from a small and local region where the magnetic field is aligned.
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