摘要
收集了Fermi Large Area Telescope第4期源表第3次修订版(Fermi Large Area Telescope Fourth Source Catalog Data Release 3, 4FGL-DR3)耀变体(Blazar)样本的多波段辐射流量密度,所收集的数据覆盖了射电1.4和143 GHz、近红外(J、H和K)、可见光(u、g、r、i和z)、紫外(far ultraviolet和near ultraviolet)、X射线以及γ射线0.1–100 GeV间的6个能段(0.1–0.3、0.3–1、1–3、3–10、10–30和30–100 GeV).分析了耀变体及其子类样本的高能γ射线各能段之间以及γ射线各能段与射电至X射线多波段辐射之间的相关性.各波段流量之间的线性回归拟合结果显示:γ射线各能段之间,相关系数大于0.7的比例为70%,置信水平高于95%的比例为95%;γ射线与同步辐射之间,相关系数大于0.4的占比为42%,置信水平大于95%的占比为94.4%,有一定的相关性;未确定类型耀变体(Blazar of Unknown Types, BCU)的高能γ射线与同步辐射之间的相关性很弱,相关系数均小于0.4.分析表明:BCU样本的拟合斜率介于蝎虎天体(BL Lac Object, BLL)样本与平谱射电类星体(Flat-Spectrum Radio Quasar, FSRQ)样本之间,应是BCU样本由BLL与FSRQ的混合导致.同步辐射与γ射线辐射的相关性表明, BLL的高能γ射线主要由同步自康普顿散射(Synchrotron SelfCompton, SSC)机制主导产生, X射线可能是同步辐射与逆康普顿散射(Inverse Compton, IC)辐射的混合.
The multi-band radiation flux data of 4FGL-DR3(Fermi Large Area Telescope FourthSource Catalog Data Release 3)blazar sample are collected,which cover 6 wave-bands,e.g.,radio 1.4 GHz and 143 GHz,near-infrared(J,H,K),optical(u,g,r,i,z),ultraviolet(FUV,NUV),X-γray,and-ray which cover energy bands(0.1–0.3 GeV,0.3–1 GeV,1–3 GeV,3–10 GeV,10–30 GeV,30–100 GeV)in the 0.1–100 GeV range.These data were fitted by linear regression to analyse theγγcorrelation among different high-energy-ray energy bands,and between the-ray and the multibandγradiation from radio to ultraviolet,of blazars.In the results of correlation analysis:among-ray bands,the proportion of the result with correlation coefficient greater than 0.7 is 70%,and the proportion ofγthe results with confidence level above 95%is 95%;among-ray bands and synchrotron radiation,the proportion mentioned above is 42%with correlation coefficient greater than 0.4 and 94.4%respectively;γthe correlation between-ray and synchrotron radiation in the unclassified blazars(Blazar of Unknown Types,BCU)is very weak,the correlation coefficients are all lower than 0.4,the slopes in fitting amongγ-ray bands are between BL Lac object(BLL)and Flat Spectrum Radio Quasar(FSRQ)sample.The reason may be that the BCU sample is mixture of BLL and FSRQ.The results show that SynchronousγSelf-Compton(SSC)scattering mechanism domains high-energy-ray in BLL,and X-ray may be the mixture of synchrotron radiation and Inverse Compton(IC)radiation.
作者
刘鑫涛
张皓晶
LIU Xin-tao;ZHANG Hao-jing(School of Physics and Electronic Information,Yunnan Normal University,Kunming 650500)
出处
《天文学报》
北大核心
2025年第5期86-105,共20页
Acta Astronomica Sinica
基金
国家自然科学基金项目(11063004)
云南省中青年学术和技术带头人后备人才(2017HB020)资助。
关键词
星系:核
γ射线:星系
方法:数据分析
辐射机制:非热
galaxies:nuclei
gamma rays:galaxies
methods:data analysis
radiation mechanisms:non-thermal
