高红移Blazar的觉醒CGRaBS J0809 +5341
Awakening of The High Redshift Blazar CGRaBS J0809+5341
摘要：
CGRaBS J 0809 +5341是一颗z = 2.144的高红移耀变体，在2014年4月19日经历了一次巨大的光学爆发，当时它的亮度达到了$\sim$ 5等，未经过滤的视星等达到了15.7等。这意味着它的绝对星等为-30.5等，使其成为宇宙中最明亮的类星体之一。这种光学耀斑促使我们在耀斑的衰减部分进行观测，覆盖了很宽的能量范围，使用{ \it核光谱望远镜阵列}，{ \it雨燕}和地面光学设施。这是第一次，该源被探测到$γ$ -射线的大面积望远镜机载{ \it费米伽马射线太空望远镜}。还观察到$\sim$ 10\%的高光学偏振。利用Sloan数字巡天光谱，我们分别用$1.5 \times 10^{45}$ erg s $^{-1}$和$10^{8.4}~M_{\odot}$估算吸积盘光度和黑洞质量.利用单带轻子辐射模型，我们再现了耀斑活动期间源的光谱能量分布。这一分析表明，发射区域可能位于宽线区域之外，并且射流变得具有辐射效率。我们还发现CGRaBS J 0809 +5341的整体性质似乎与目前在高红移耀变体中观察到的一般性质不一致。
英文摘要：
CGRaBS J0809+5341, a high redshift blazar at z = 2.144, underwent a giant optical outburst on 2014 April 19 when it brightened by $\sim$5 mag and reached an unfiltered apparent magnitude of 15.7 mag. This implies an absolute magnitude of -30.5 mag, making it one of the brightest quasars in the Universe. This optical flaring triggered us to carry out observations during the decaying part of the flare covering a wide energy range using the {\it Nuclear Spectroscopic Telescope Array}, {\it Swift}, and ground based optical facilities. For the first time, the source is detected in $γ$-rays by the Large Area Telescope onboard the {\it Fermi Gamma-Ray Space Telescope}. A high optical polarization of $\sim$10\% is also observed. Using the Sloan Digital Sky Survey spectrum, accretion disk luminosity and black hole mass are estimated as $1.5 \times 10^{45}$ erg s$^{-1}$ and $10^{8.4}~M_{\odot}$ respectively. Using a single zone leptonic emission model, we reproduce the spectral energy distribution of the source during the flaring activity. This analysis suggests that the emission region is probably located outside the broad line region, and the jet becomes radiatively efficient. We also show that the overall properties of CGRaBS J0809+5341 seems not to be in agreement with the general properties observed in high redshift blazars up to now.
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