Mrk 421天体的多波段辐射机制  

Multi-band Radiation Mechanism of Mrk 421 Object

作　　者：谢星星 康世举 刘文广[1] XIE Xing-xing;KANG Shi-ju;LIU Wen-guang(College of Physics and Electronic Information,Yunnan Normal University,Kunming 650092,China;School of Physics and Electrical Engineering,Liupanshui Normal University,Liupanshui 553044,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650092 [2]六盘水师范学院物理与电气工程学院,贵州六盘水553004

出　　处：《云南师范大学学报（自然科学版）》2020年第5期1-6,共6页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：国家自然科学基金资助项目(11873043,11763005)。

摘　　要：电子在激波上游通过扩散和对流获得能量,然后漂移到激波下游辐射区经过冷却损失能量并形成电子能量分布,利用上述过程中形成的电子能量分布,基于同步自康普顿模型计算了蝎虎天体Mrk 421的多波段辐射能谱.计算结果表明:(1)由于低能电子冷却时标较长,形成的电子分布的低能部分对辐射能谱没有贡献;(2)选取合理的模型参数,模型计算结果与Mrk 421天体四个不同观测时期的多波段观测结果一致.推测电子分布的高能部分对辐射能谱的贡献和电子能量损失过程中临界能量的改变都可能导致Mrk 421天体的能谱变化.Electrons gain energy in the upstream of shock wave through diffusion and advection,and then drift to the downstream of shock wave and lose energy in the cooling process to form electron energy distribution.The multi-band radiation energy spectrum of Mrk 421 is calculated based on the synchrotron self-Compton model by using the electron energy distribution formed during the above process.The results show that:(1)the low energy part of the electron distribution has no contribution to the radiation energy spectrum due to the long cooling timescale of the low energy electrons;(2)by selecting reasonable model parameters,it is found that the model calculation results are consistent with the multi-band observation results of Mrk 421 object in four different observation epochs.We found that the contribution of the high energy part of the electron distribution to the radiation energy spectrum and the change of the critical energy during the process of electron energy loss may lead to the change of the energy spectrum of the Mrk 421 object.

关 键 词：粒子加速 辐射机制 蝎虎天体(Mrk 421) 

分 类 号：P157[天文地球—天文学]