Detection of Polarimetric Variations Associated with the Shortest Time-Scale Variability in S5 0716+714
Detection of Polarimetric Variations Associated with the Shortest Time-Scale Variability in S5 0716+714
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DOI：
10.1093/pasj/60.6.l37
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发表时间：
2008-12
影响因子：
2.3
通讯作者：
M. Sasada;M. Uemura;A. Arai;Y. Fukazawa;K. Kawabata;T. Ohsugi;T. Yamashita;M. Isogai;S. Sato-S.
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文献类型：
--
作者：
M. Sasada;M. Uemura;A. Arai;Y. Fukazawa;K. Kawabata;T. Ohsugi;T. Yamashita;M. Isogai;S. Sato-S.
本文介绍了用KANATA望远镜对BL Lac天体S50716 $+$714进行的近红外和光学观测的结果。S5 0716 $+$714既有长期高幅变化，也有一夜之内的短期变化。最短变率（微变率）时间尺度对于理解喷流和磁场的几何形状是重要的，因为它提供了可能的最小变率源尺寸。在这里，我们报告的检测15分钟的变化在S5 0716 $+$714，这是最短的时间尺度在耀变体中观察到的光学和近红外变化。检测到的微变在$V $带的振幅为0.061 {\pm} 0.005 $mag，蓝色为$\Delta（V-J）=-0.025 {\pm} 0.011 $。此外，我们成功地检测到一个前所未有的，短时间尺度的偏振变化与亮度的变化。我们发现，微变化有一个特定的偏振分量。变化分量的偏振度大于总通量的偏振度。这些结果表明，微变起源于一个小的和局部的区域，磁场是对齐的。
We present the result of near-infrared and optical observations of the BL Lac object S5 0716$ + $714 carried out by the KANATA telescope. S5 0716$ + $714 has both a long term high-amplitude variability and a short-term variability within a night. The shortest variability (microvariability) time-scale is important for understanding the geometry of jets and magnetic field, because it provides a possible minimum size of variation sources. Here, we report the detection of 15-min variability in S5 0716$ + $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 $\Delta(V-J)=-0.025{\pm}0.011$. 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.