论文标题
$γ$ ray发射Blazars的夜晚光学可变性监视
Intra-night optical variability monitoring of $γ$-ray emitting blazars
论文作者
论文摘要
我们介绍了从我们的活动中获得的结果，以表征{\ it fermi}大面积望远镜检测到的夜间光学变化属性。这涉及R-band监视18个Blazars样品的观察结果，其中包括5个平面无线电类星体（FSRQ）和13个BL LAC对象（BL LACS），覆盖了RedShift范围Z = 0.085 $ -1.184。我们的观察结果使用1.3 M J.C. Bhattacharya望远镜进行了40晚（$ \ sim $ 200 hrs），从2016年12月至2020年3月期间开始。我们使用功率增强的$ f- $测试来表征可变性。我们发现FSRQ的可变性约为11 \％的占空比（DC）和BL LAC的12 \％。根据同步子在其宽带光谱能量分布（SED）中的位置将样品分为不同的子类，我们发现DC为$ \ sim $ 16 \％，$ \ sim $ 10 \％\％\％和$ \ sim $ 7 \％$ \ sim $ 7 \％的低中心旋转（LSP）峰值（LSP），Intermedimed Synchrotrotron峰值（INSCHROTROTENED）和高点（ISP）和高峰值（HSSP）和高峰值（HSP）。可以在R波段追踪宽带SED的同步加速器成分的下降部分（由高能电子贡献的掉落部分（由高能电子贡献）的背景下，可以理解LSP Blazars中这种高可变性的高直流。同样，在ISP和HSP Blazars的情况下，R-band追踪上升的同步器部分（由低能电子产生）可能会导致较小的变异性。因此，相对于ISP和HSP Blazar的LSP Blazars中观察到的高DC与Blazar Jets发射的松弛模型一致。
We present the results obtained from our campaign to characterize the intra-night-optical variability properties of blazars detected by the {\it Fermi} Large Area Telescope. This involves R-band monitoring observations of a sample of 18 blazars, that includes five flat-spectrum radio quasars (FSRQs) and thirteen BL Lac objects (BL Lacs) covering the redshift range z = 0.085$-$1.184. Our observations, carried out using the 1.3 m J.C. Bhattacharya Telescope cover a total of 40 nights ($\sim$200 hrs) between the period 2016 December and 2020 March. We characterized variability using the power enhanced $F-$test. We found a duty cycle (DC) of the variability of about 11\% for FSRQs and 12\% for BL Lacs. Dividing the sample into different sub-classes based on the position of the synchrotron peak in their broadband spectral energy distribution (SED), we found DC of $\sim$16\%, $\sim$10\% and $\sim$7\% for low-synchrotron peaked (LSP), intermediate synchrotron peaked (ISP) and high synchrotron peaked (HSP) blazars. Such high DC of variability in LSP blazars could be understood in the context of the R-band tracing the falling part (contributed by high energy electrons) of the synchrotron component of the broadband SED. Also, the R-band tracing the rising synchrotron part (produced by low energy electrons) in the case of ISP and HSP blazars, could cause lesser variability in them. Thus, the observed high DC of variability in LSP blazars relative to ISP and HSP blazars is in accordance with the leptonic model of emission from blazar jets.
