BL Lac天体喷流物理参数的限定

The Synchrotron + Synchrotron Self Compton (SSC) model is used to fit the quasi-simultaneous multi-band observational data of BL Lac objects, and the relevant jet physical parameters can be obtained, thus enabling an explanation of the physical properties of the jets of BL Lac objects. In the SSC model, a large number of free parameters bring great uncertainties to the calculation results. At the same time, due to the too large range of these model parameters, the spectral fitting efficiency is reduced. Using the physical quantity values obtained from multi-band observational data, the eight model parameters involved in the single-zone, homogeneous SSC model in the case of a double power-law electron distribution are constrained. In addition, the model is also used to calculate the multi-band spectra of two typical BL Lac objects to test the results of parameter constraints. The results show that within the range constrained by the eight model parameters, the theoretical photon spectra calculated with the selected model parameter values are in good agreement with the quasi-simultaneous multi-band observational data of the two BL Lac objects.

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.