耀变体中红外日内光变特征研究  

Study on the Characterization of Intra-Day Variability in the Mid-infrared of Blazars

作　　者：普治元 易庭丰[1,2] 张顺 王亮 陈雨潼[1] Pu Zhiyuan;Yi Tingfeng;Zhang Shun;Wang Liang;Chen Yutong(School of Physics and Electronic Information,Yunnan Normal University,Kunming 650500,China;Guangxi Key Laboratory for the Relativistic Astrophysics,Nanning 530004,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]广西相对论天体物理重点实验室,广西南宁530004

出　　处：《天文研究与技术》2023年第6期497-509,共13页Astronomical Research & Technology

基　　金：国家自然科学基金(12063007,11863007);国家天文台云南师范大学天文科普教育基地(04800205020503008)资助.

摘　　要：光变是耀变体(Blazars)最基本的观测特征之一,其日内光变(Intra-Day Variability,IDV)的产生仍然是一个存在争议的问题。将4LAC-DR2目录与第5期Roma-BZCAT目录相结合,利用ALLWISE项目的数据研究了不同类别耀变体的中红外日内光变的特征。结果显示:(1)低峰频耀变体(Low Synchrotron Peaked Blazars,LSPs)的日内光变相比于中峰频耀变体(Intermediate Synchrotron Peaked Blazars,ISPs)和高峰频耀变体(High Synchrotron Peaked Blazars,HSPs)展现出更大的光变幅度;(2)平谱射电类星体(Flat Spectrum Radio Quasars,FSRQ)的日内光变相比蝎虎座BL型星体(BL Lacertae objects,BL Lacs)也展现出更大的光变幅度,而且两者的颜色变化都有变亮变蓝的趋势;(3)与非费米(Fermi)探测到的耀变体相比,费米卫星探测到的耀变体的日内光变展现出更小的光变幅度。基于上述结果研究认为,观测到的耀变体中红外波段辐射可能来自于~10-4 pc的空间尺度范围,其日内光变的产生可能与喷流内部的物理过程有关,日内光变的光变幅度可能与光谱能量分布(Spectral Energy Distribution,SED)的同步峰存在紧密联系。The variability is one of the most fundamental observational features of Blazars,the generation of Intra-Day Variability(IDV)is still a controversial issue.In this paper,we combine the 4LAC-DR2 catalog with the fifth Roma-BZCAT catalog to study the characteristics of mid-infrared IDV of different classes of Blazars using data from the ALLWISE project.The results show that:(1)The IDV of Low Synchrotron Peaked Blazars(LSPs)exhibit larger variability amplitudes compared to Intermediate Synchrotron Peaked Blazars(ISPs)and High Synchrotron Peaked Blazars(HSPs);(2)The IDV of Flat Spectrum Radio Quasars(FSRQs)also exhibit larger variability amplitudes compared to BL Lacertae objects(BL Lacs),and the color changes of both tend to become bluer when brighter;(3)The IDV of Fermi-detected Blazars exhibits a smaller variability amplitude compared to Non-Fermi-detected Blazars.Based on the study of the above results,we suggest that Blazars′observed emission in the mid-infrared band may come from a spatial scale range of~10-4 pc,that its IDV production may be related to physical processes intrinsic the jet,and that the amplitudes of the IDV may be closely related to the synchrotron peak of the Spectral Energy Distribution(SED).

关 键 词：耀变体 中红外光变 喷流 统计 

分 类 号：P157[天文地球—天文学]