The variability analysis of PKS 2155-304

Abstract

In this paper, the post-1977 photometric observations of PKS 2155-304 are compiled and used to discuss the variation periodicity. Largest amplitude variations ($\Delta U=1^m.5$; $\Delta B=1^m.65$; $\Delta V=1^m.85$; $\Delta R=1^m.25$; $\Delta I=1^m.14$) and color indices ($(B-V)=0.30\pm 0.06$; $(U-B)=-0.72\pm 0.08$; $(B-R)=0.62\pm 0.07$; $(V-R)=0.32\pm 0.04$) are found. The Jurkevich's method and DCF (Discrete Correlation Function) method indicate possible periods of 4.16-year and 7.0-year in the V light curve.

11 pages, 4 figures, A&A (accepted)