Study of Optical and Gamma-ray Long-term Variability in Blazars

Blazars, a subset of powerful active galactic nuclei, feature relativistic jets that shine in broadband electromagnetic radiation, e. g. from radio to TeV emission. Here I present the results studies explore gamma-ray and optical variability properties sample bright sources Several methods time-series analyses are performed on decade-long Fermi/LAT observations. The main as follows: found highly variable both bands, power spectral density is be consistent with flicker noise suggesting long-memory processes at work. While comparing two emission, not only overall $\gamma$-ray emission correlated but also observation distributions exhibit heavy tailed log-normal distribution linear RMS-flux relation. In addition, some indications quasi-periodic oscillation were revealed similar characteristic timescales bands. We discuss light current blazar models shocks propagating down jet viewed close line sight.