4-year optical-infrared photometric and polarimetric behaviors of a gamma-ray blazar 3C 454.3
4-year optical-infrared photometric and polarimetric behaviors of a gamma-ray blazar 3C 454.3
复制标题
伽马射线耀变体 3C 454.3 的 4 年光学红外光度和偏振行为
DOI：
10.1051/epjconf/20136106009
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发表时间：
2013
影响因子：
5
通讯作者：
Michitoshi Yoshida
中科院分区：
文献类型：
--
作者：
M. Sasada;M. Uemura;Y. Fukazawa;R. Itoh;K. Kawabata;Michitoshi Yoshida
自2007年以来，我们对45颗光学亮耀变体进行了多色偏振监测。3C 454.3是伽玛射线天空中最亮的耀变体之一，也是该项目的目标之一。自2007年7月以来，我们进行了光偏振监测。该物体的通量和偏振显示出剧烈的变化。特别是2007年、2008年、2009年和2010年的四次大幅度爆发，令人瞩目。在每次爆发中，我们观察到偏振度的显著上升。根据4年的观测资料计算了总通量和偏振度的结构函数。在此期间，我们估计了其结构函数的系统误差和统计误差。我们采用这些错误时，我们估计的休息时间尺度。3C454.3中总通量的破缺时间尺度比极化的破缺时间尺度长。我们还计算了15个被高频监测的耀变体的总通量和偏振结构函数，并估计了它们的破裂时间尺度。总通量的突变时间尺度大多比偏振的突变时间尺度长。结果表明，总流量的突变时间尺度反映为类似于爆发的大幅度、长时间的变化。然而，偏振的破裂时间尺度与日尺度耀斑的时间尺度有关。
We have performed a multi-color photo-polarimetric monitoring of 45 optical-bright blazars since 2007.3C 454.3, which is one of the brightest blazars in the gamma-ray sky, is one of targets of its project. We have made photo-polarimetric monitorings since July 2007. The object showed violent variation in its flux and polarization. In particular, four large-amplitude outbursts in 2007, 2008, 2009 and 2010 are remarkable. In each outburst, we observed a significant rise in the polarization degree. We calculated structure functions of the total flux and polarization from the 4-year monitoring data. In this time, we estimate the systematic and statistical errors of its structure functions. We adopt these errors when we estimate the break time-scales. The break time-scale of the total flux in 3C 454.3 is longer than that of the polarization. We also calculate the structure functions from total flux and polarization of the 15 blazars which are high-frequency monitored, and estimate the break time-scales. Most of estimated break time-scales of the total fluxes are longer than that of the polarization. From these results, it is indicated that the break time-scale of the total flux is reflected to the larger-amplitude and longer variation, like the outburst. However, the break time-scale of the polarization is related to the time-scale of the day-scale flares.