Multi-wavelength Photometric and Polarimetric Observations of the Outburst of 3C 454.3 in Dec. 2009
Multi-wavelength Photometric and Polarimetric Observations of the Outburst of 3C 454.3 in Dec. 2009
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2011
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通讯作者：
Mahito;Makoto;Yasushi;S. Koji;Ryosuke;Itsuki;Kenta;Akiko;Takashi;Michitoshi;Hajimu;Masayuki;Shuji;Masaru
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作者：
Mahito;Makoto;Yasushi;S. Koji;Ryosuke;Itsuki;Kenta;Akiko;Takashi;Michitoshi;Hajimu;Masayuki;Shuji;Masaru
2009年12月，明亮的耀变体3C 454.3在光学、X射线和伽马射线区域表现出强烈的爆发。我们进行了光度和偏振监测的光学和近红外波段与TRISPEC和HOWPol连接到金田望远镜的爆发。我们还用AKARI在红外波段观测到了这次爆发，用山口大学的32米射电望远镜在射电波段观测到了这次爆发。从JD 2455055到2455159，该对象处于活动状态。在光学波段，它比JD 2455055之前的静止状态亮1.3等。在JD 2455159的活动状态结束后，在所有波长上都观察到了显著的爆发。爆发持续了两个月。我们的光学和近红外偏振观测表明，在活跃状态（JD 2455063- 2455074）下，偏振位置角（PA）在11 d内明显顺时针旋转了240度，并且在此旋转之后，PA在我们的监测期间几乎保持不变。在爆发状态下，PA在35 d内平滑地逆时针旋转350度（JD 2455157-2455192）。因此，我们检测到两个不同的旋转事件的偏振矢量在相反的方向。我们将这两个事件与2005年、2007年和2008年观察到的过去的旋转事件进行了比较。
In December 2009, the bright blazar, 3C 454.3 exhibited a strong outburst in the optical, X-ray and gamma-ray regions. We performed photometric and polarimetric monitoring of this outburst in the optical and near-infrared bands with TRISPEC and HOWPol attached to the Kanata telescope. We also observed this outburst in the infrared band with AKARI, and the radio band with the 32-m radio telescope of Yamaguchi University. The object was in an active state from JD 2455055 to 2455159. It was 1.3 mag brighter than its quiescent state before JD 2455055 in the optical band. After the end of the active state in JD 2455159, a prominent outburst was observed in all wavelengths. The outburst continued for two months. Our optical and near-infrared polarimetric observations revealed that the position angle of the polarization (PA) apparently rotated clockwise by 240 degrees within 11 d in the active state (JD 2455063— 2455074), and after this rotation, PA remained almost constant during our monitoring. In the outburst state, PA smoothly rotated counterclockwise by 350 degrees within 35 d (JD 2455157—2455192). Thus, we detected two distinct rotation events of polarization vector in opposite directions. We discuss these two events compared with the past rotation events observed in 2005, 2007 and 2008.