The variability analysis of PKS 2155-304

TL;DR

This study compiles photometric data of PKS 2155-304 post-1977 to analyze its variability, identifying amplitude variations, color indices, and potential periodicities of approximately 4.16 and 7.0 years using statistical methods.

Contribution

It provides a comprehensive variability analysis of PKS 2155-304, including amplitude, color indices, and potential periodicities, using multiple statistical techniques.

Findings

Amplitude variations up to 1.85 magnitudes across bands

Color indices with specific average values and uncertainties

Possible periodicities of 4.16 and 7.0 years in the light curve

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.