费米甚高能γ射线耀变体谱指数、能谱峰值频率和能谱曲率相关性研究  

Correlation Study of Fermi TeV Blazars Spectrum Index,Peak Frequency of Energy Spectrum and Energy Spectrum Curvature

作　　者：周瑞鑫 朱柯睿 马力 康世举 郑永刚[1] Zhou Ruixin;Zhu Kerui;Ma Li;Kang Shiju;Zheng Yonggang(School of Physics and Electronic Information,Yunnan Normal University,Kunming 650500,China;School of Physics and Electrical Engineering,Yuxi Normal University,Yuxi 653100,China;School of Physics and Electrical Engineering,Liupanshui Normal University,Liupanshui 553004,China)

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650500 [2]玉溪师范学院物理与电子工程学院,云南玉溪653100 [3]六盘水师范学院物理与电气工程学院,贵州六盘水553004

出　　处：《天文研究与技术》2021年第1期1-24,共24页Astronomical Research & Technology

基　　金：国家自然科学基金(11873043,11763005);贵州省科学技术基金(黔科合基础[2019]1290)资助.

摘　　要：收集了69个费米甚高能γ射线(TeV)耀变体样本的平均态多波段数据,并用对数抛物线模型(The Log-parabolic Model)对能谱分布(The Spectral Energy Distribution,SED)进行拟合,获得相关物理参数。分别对谱指数、能谱峰值频率、能谱曲率3个物理参数进行统计分析,结果如下:(1)高峰频蝎虎天体(High-Synchrotron peaked BL Lacertae objects,HBLs)、中峰频蝎虎天体(Intermediate-Synchrotron peaked BL Lacertae objects,IBLs)、低峰频蝎虎天体(Low Synchrotron peaked BL Lacertae objects,LBLs)和平谱射电类星体(Flat Spectrum Radio Quasars,FSRQs)的谱指数分布各异,除射电波段外,样本中蝎虎天体在不同波段谱指数大小呈现高峰频蝎虎天体<中峰频蝎虎天体<低峰频蝎虎天体的分布规律;(2)样本中蝎虎天体(BL Lacertae objects)的同步辐射能谱的峰值频率和逆康普顿散射能谱的峰值频率之间呈现正相关关系,表明甚高能γ射线蝎虎天体多波段辐射能较好地用同步自康普顿模型解释;(3)通过聚类分析给定高峰频蝎虎天体、中峰频蝎虎天体、低峰频蝎虎天体和平谱射电类星体的能谱曲率分布范围,表明这4类天体样本的能谱曲率分布不同;(4)同步辐射能谱的峰值频率和逆康普顿散射能谱的峰值频率与红外、光学、紫外和软X射线波段的谱指数之间都呈现较强的负相关关系,而同步辐射能谱曲率和除射电波段外的各波段谱指数之间呈现正相关关系;(5)同步辐射能谱的峰值频率和同步辐射能谱曲率之间呈现较强的负相关关系。In this paper,the average state multiband data of 69 Fermi TeV blazars samples are collected,and the distribution of energy spectrum is fitted with a logarithmic parabolic model to obtain the relevant physical parameters.The paper conducts statistical analysis on three physical parameters,namely,spectral index,peak frequency of energy spectrum and energy spectrum curvature,and the results are as follows:(1)the spectral index distributions of HBLs,IBLs,LBLs and FSRQs are different,and the spectral index sizes of diffferent bands show the distribution law of HBLs<IBLs<LBLs,in the sample of BL lacs,except the radio bands.(2)there is a positive linear correlation between the peak frequency of the synchrotron radiation energy spectrum of BL Lac objects and the peak frequency of the inverse Compton scattering energy spectrum,indicating that the multi-band radiation energy of TeV BL Lac objects is well explained by the synchronous synchrotron-self-compton model.(3)through cluster analysis of the energy spectrum curvature distribution range of the given four types of samples of HBLs,IBLs,LBLs and FSRQs,it is shown that the spectral curvature distribution of the four types of samples of HBLs,IBLs,LBLs and FSRQs are different.(4)the peak frequency of the synchrotron radiation energy spectrum and the inverse Compton scattering energy spectrum have a strong negative correlation with the spectrum index of the infrared,optical,ultraviolet and soft X-ray bands,while the curvature of the synchrotron radiation energy spectrum has a positive correlation with the spectrum index of all bands except the radio band.(5)there is a strong negative correlation between the peak frequency of the synchrotron radiation energy spectrum and the curvature of the synchrotron radiation energy spectrum.

关 键 词：星系 甚高能γ射线耀变体 辐射机制 非热辐射 统计 

分 类 号：P157[天文地球—天文学]