费米耀变体的X射线辐射  

X-ray Emissions for Fermi Blazars

作　　者：杨江河[1,2] 樊军辉[2,3] 张月莲[4] 杨如曙[1] 庹满先[1] 聂建军[1] YANG Jiang-he;FAN Jun-hui;ZHANG Yue-lian;YANG Ru-shu;TUO Man-xian;NIE Jian-jun(Department of Physics and Electronics Science,Hunan University of Arts and Science,Changde 415000;Center for Astrophysics,Guangzhou University,Guangzhou 510006;Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,Guangzhou 510006;Mathematics and Computational Science,Hunan University of Arts and Science,Changde 415000)

机构地区：[1]湖南文理学院物理与电子科学学院,常德415000 [2]广州大学天体物理中心,广州510006 [3]广东省教育厅天文观测与技术重点实验室,广州510006 [4]湖南文理学院数学与计算科学学院常德415000

出　　处：《天文学报》2018年第4期106-114,共9页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(U1431112、11733001、U1531245、11403006),广东省自然科学基金项目(2017A030313011),广东创新团队基金项目(2014KCXTD014),广东省和广州市天体物理重点学科,湖南省自然科学基金项目(2015JJ2104),湖南省教育厅研究基金项目(16C1081)资助。

摘　　要：耀变体(blazar)的X射线辐射位于同步辐射的尾部及逆康普顿辐射的前部分,因此其辐射起源较为复杂.耀变体从射电到X射线波段辐射的谱能分布(SED)可用抛物线函数近似拟合.若将该拟合所得拟合曲线近似视为耀变体的物理谱,分析费米(Fermi)耀变体的X射线辐射,则结果表明:耀变体的X射线辐射包含同步辐射和逆康普顿辐射2个成份,并可用该拟合线将X射线的同步辐射和逆康普顿辐射成份进行简单分离;源的同步峰频越高,其同步辐射成份越多,而其逆康普顿辐射成份越少;在X射线1 keV处,对于平谱射电类星体(FSRQ)、低同步峰BL Lac天体(LBL)和高同步峰BL Lac天体(HBL),其同步辐射成份占总辐射的比例分别为17%、27%和73%;同步峰频与X射线1 keV处同步辐射流量密度有强正相关,而与逆康普顿辐射流量密度无相关;在X射线波段,LBL的辐射机制与FSRQ的类似.The X-ray emissions of blazars are located at the end of synchrotron emissions and the start of inverse Compton emissions.Therefore,the origin of X-ray is more complex.The spectral energy distribution(SED)of blazars from radio to X-ray bands can be fitted approximatively by a parabolic function.If the fitting curve is considered as the physical spectrum of blazars to analyze the X-ray emissions for Fermi blazars,the results show that:(1)The X-ray emission of blazars contains two components,i.e.synchrotron emission and inverse Compton emission,which can be separated by the fitting curve of blazar;(2)The higher the synchrotron peak frequency of the source,the more synchrotron components,and the less the inverse Compton component;(3)At 1 keV of X-ray,the synchrotron component accounts for 17%,27%,and 73%of the total X-ray emissions,for FSRQs(Flat Spectrum Radio Quasars),LBLs(Low synchrotron peak frequency BL Lac objects),and HBLs(High synchrotron peak frequency BL Lac objects),respectively;(4)There is a strong positive correlation between synchrotron peak frequencies and synchrotron emission fluxes,while no correlation between synchrotron peak frequencies and inverse Compton emission fluxes;(5)The radiation mechanism of LBLs may be similar to that of FSRQs in X-ray bands.

关 键 词：星系:活动 辐射机制:非热 X射线:星系 方法:统计 

分 类 号：P157[天文地球—天文学]