Optical and Gamma-Ray Variability Behaviors of 3C 454.3 from 2006 to 2011

Optical and Gamma-Ray Variability Behaviors of 3C 454.3 from 2006 to 2011
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2006 年至 2011 年 3C 454.3 的光学和伽马射线变异行为

DOI:
10.3847/1538-4357/aab09d
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发表时间:
2018-02
影响因子:
4.9
通讯作者:
Bai Jin Ming
Bai Jin Ming
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fan Xu Liang;Li Shao Kun;Liao Neng Hui;Chen Liang;Liu Hong Tao;Lu Kai Xing;Yan Da Hai;Zhang Rui Yu;Guo Qian;Wu Qingwen;Bai Jin Ming

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本文介绍了2006 - 2011年云南天文台对平谱射电类星体3C 454.3的测光监测。我们发现3C 454.3的光学颜色呈现出明显的越亮越红的趋势,当V波段光源亮度超过15.15等时,光学颜色达到饱和。我们进行了模拟与多个值的磁盘光度和光谱指数再现的星等颜色图。结果表明,单独由盘辐射引起的污染难以产生所观察到的颜色变化。2009年12月爆发期间的变化特性也与费米γ射线空间望远镜获得的γ射线数据进行了比较。这两个带的通量变化与α呈线性关系,为3C454.3的外康普顿过程提供了观测证据。同时,这种通量相关性表明电子注入是引起变率的主要机制。我们还探讨了光变曲线中通量比Fγ/FR的变化和细节结构,并讨论了细节变化行为的可能来源。
We present our photometric monitoring of a flat spectrum radio quasar 3C 454.3 at Yunnan observatories from 2006 to 2011. We find that the optical color of 3C 454.3 shows an obvious redder-when-brighter trend, which reaches a saturation stage when the source is brighter than 15.15 mag at V band. We perform a simulation with multiple values of disk luminosity and spectral index to reproduce the magnitude–color diagram. The results show that the contamination caused by the disk radiation alone is difficult to produce the observed color variability. The variability properties during the outburst in 2009 December are also compared with γ-ray data derived from the Fermi γ-ray space telescope. The flux variation of these two bands follows a linear relation with , which provides observational evidence for the external Compton process in 3C 454.3. Meanwhile, this flux correlation indicates that electron injection is the main mechanism for the variability origin. We also explore the variation of the flux ratio Fγ/FR and the detailed structures in the light curves, and discuss some possible origins for the detailed variability behaviors.
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