Multiwavelength Temporal Variability of the Blazar PKS 1510–089

Abstract We perform correlation and periodicity search analyses on long-term multiband light curves of the flat-spectrum radio quasar PKS 1510−089 observed by space-based Fermi-Large Area Telescope in γ -rays, SMARTS Steward Observatory telescopes optical near-infrared (NIR), 13.7 m telescope Metsähovi Radio between 2008 2018. The z -transform discrete function method is applied to study possible time lags among these curves. Among all pairs wavelengths, -ray versus optical/NIR NIR correlations show zero lags; however, both emissions precede radiation. generalized Lomb–Scargle periodogram, weighted wavelet -transform, REDFIT techniques are employed investigate unresolved core emission–dominated 37 GHz curve yield evidence for a quasi period around 1540 days, although given length whole data set it cannot be claimed significant. also color variability find that this source shows simple redder-when-brighter behavior over time, even low-flux state.