Study on Optical Variability of Blazar PKS 1424-41 in Multiband

The variability is an important observational feature of Blazars. In order to study the multiband optical variability of Blazar, we collected the light curves of PKS 1424-41 of the gamma-ray band (0.1-100 GeV), optical R band, near infrared K band, X band and radio band, released by Fermi LAT, SMARTS, SWIFT (XRT) and Submillimeter Array (SMA). Discrete correlation function is used to analyze the correlation between the light curves. The results show that the gamma-ray band, X-band, optical R-band, near-infrared K-band and radio band are strongly correlated with each other, and there is a time delay between the bands. This result supports the “single region” lepton radiation model. The LSP (Lomb-Scargle Periodogram) method is used to analyze the Quasi-periodic Oscillations (QPO) of PKS 1424-41 for the γ band Light Curve in a flare period (MJD56100-MJD56500). It is found that there are two QPOs in this period: ~75 days and ~50 days, with a ratio of 3∶2. The helical structure of the jet itself and the radiation of high-energy plasma matter moving within it may be the origin of this monthly QPO.