BL Lac天体喷流物理参数的限定  

Determination of the Physical Parameters of BL Lac Objects Jets

作　　者：方雪 伍林[1] 毛慰明[1] 康世举 郑永刚[1] FANG Xue;WU Lin;MAO Wei-ming;KANG Shi-ju;ZHENG Yong-gang(School of Physics and Electronic Information Technology,Yunnan Normal University,Kunming 650500;School of Physics and Electrical Engineering,Liupanshui Normal University,Liupanshui 553004)

机构地区：[1]云南师范大学物理与电子信息学院,昆明650500 [2]六盘水师范学院物理与电气工程学院,六盘水553004

出　　处：《天文学报》2020年第5期8-17,共10页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11873043、11763005);贵州省教育厅科技拔尖人才支持项目(黔教合KY字[2018]068)资助。

摘　　要：同步+同步自康普顿(Synchrotron+Synchrotron Self Compton(SSC))模型用于拟合蝎虎天体(BL Lac object,BL Lac)准同时性多波段观测数据,可以获得相关的喷流物理参数,从而能对BL Lac天体喷流的物理性质进行解释.在同步自康普顿模型中,较多的自由参数给计算结果带来很大的不确定性,同时,由于这些模型参数范围太大降低了能谱拟合效率.利用多波段观测数据获得的物理量值,对双幂律电子分布情况下的单区、均匀SSC模型中涉及到的8个模型参数进行限定.另外,还利用模型计算两个典型的BL Lac天体多波段能谱对参数限定的结果进行检验.结果表明:在8个模型参数限定的范围内,选取的模型参数值计算出的理论光子谱与两个BL Lac天体的多波段准同时性观测数据符合较好.The synchrotron+synchrotron-self-Compton(SSC)model can be used tofit the multi-wavelength quasi-simultaneous data of BL Lacs to obtain the relevant jet physical parameters,which is able to explain the physical properties of BL Lac jets.A great deal of free parameters bring too much uncertainty to the calculation results in SSC model.Due to the spaces of these model parameters are too large,the efficiency of energy spectrum fitting is reduced.Nevertheless,in this paper,we obtain the physical quantities from the multi-band observation data.And we determine the 8 parameters in the single-zone homogeneous SSC model with the broken double-powerlaw electronic injection.What’s more,we use the SSC model to calculate two typical BL Lacs multiwavelength spectral energies to test our determined results.The results indicate that within the determination of 8 model parameters space,we calculate the theoretical photon spectrum with the model parameters,which is in favorable agreement with the quasi-simultaneously observed data of the two BL Lacs.

关 键 词：辐射机制:非热 星系:活动 BL Lac天体:Mrk 421 Mrk 501 

分 类 号：P157[天文地球—天文学]