耀变天体3C 454.3高能光变行为的研究  

Study on the high energy variability of blazar 3C 454. 3

作　　者：刘宝容[1,2] 张海明[1,2] 要东 

机构地区：[1]广西大学物理科学与工程技术学院,广西大学-国家天文台天体物理和空间科学研究中心,广西南宁530004 [2]广西大学广西相对论天体物理重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2016年第6期1912-1917,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(11463001);广西自然科学基金资助项目(2014GXNSFAA118024)

摘　　要：为研究耀变天体3C 454.3高能光变行为,采用结构函数和离散关联函数法对该源近8年Fermi/LAT伽玛波段流量监测结果进行分析。结构函数分析表明:近8年的高能光变中存在多个特征光变时标,最小特征光变时标6 d;宁静态前后两段不同光变幅度的伽玛光变有类似变化趋势,均有最小特征光变时标6 d;整个光变存在可能周期230 d和350 d,与离散关联函数分析得到的周期223 d和351 d近似一致。根据周期分析理论,推断耀变天体3C 454.3伽玛波段光变存在周期(226±3.5)d和(250±0.5)d。与以前的研究结果对比,耀变体3C 454.3高能光变存在双周期是一个新发现。In order to study the high energy variability of blazar 3C 454.3,the structure functions and discrete correlation functions are adopted to analyze the observational data of Fermi / LAT within8 years. Structure function analyses show that there is several characteristic variability timescales in those observational data,the minimum variability timescale is about 6 days. A similar evolution trend of variable amplitude is clearly seen before and after the quiescence of light curves,which also has 6days minimum variability timescale. Two possible variability periods of - 230 days and - 350 days are found in the whole light curves,which is consistent with the result of discrete auto-correlation function,e.g. 223 days and 351 days. According to periodic analysis theory,the two periods of 226±3. 5 days and 250±0. 5 days are deduced to exist in the light curves of blazar 3C 454. 3 at gamma band. Compared with the results of previous studies,the existence of two periods in the high energy light curves of blazar 3C 454. 3 is a new discovery.

关 键 词：3C 454.3 特征光变时标 周期 

分 类 号：P14[天文地球—天体物理]