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The Variability Analysis of BL Lac Objects PKS 2155-304

GAO Rong;YANG Jin-xue;LI Huai-zhen;Department of Physics,Yuxi Normal University;  
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=311.8days 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 and I band.This suggests that the radiation process of optical R,V and I band is the same.
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