BL Lac天体PKS2155-304光变特性分析

The Variability Analysis of BL Lac Objects PKS 2155-304

从文献中收集了BL Lac天体PKS 2155-304在光学R、V和I波段历史光变数据.利用功率谱方法对PKS 2155-304在三个波段的光变曲线进行周期性分析,结果表明PKS 2155-304在光学波段存在约311.8d的光变周期,该结果可以被螺旋喷流模型解释.利用离散相关函数法分析了三个波段间的相关性,结果显示三个波段具有较强的相关性,这表明他们的辐射过程是一致的.

The light curves of BL Lac Objects PKS 2155 304 at the optical R, V and I band were collected and the period of PKS 2155-304 were studied by using the power spectrum estimation method. The results suggest that there is a period of P=311.8 days in the optical R, V and I band. The helical jet model can provide an adequate explanation of the periodicity variability. In addition, the cross-correlation analysis of PKS 2155 304 was carried out, and it was confirmed that there exists very well correlation between R,V process of optical R,V and I band is the same. and I band. This suggests that the radiation process of optical R,V and I band is the same.