Speaker
Description
Active galactic nuclei (AGNs) are among the most energetic objects in the Universe, with relativistic jets launched by accreting supermassive black holes. Blazars, a subclass of AGNs with jets aligned close to our line of sight, often exhibit strong variability across the electromagnetic spectrum. Quasi-periodic oscillations (QPOs) in blazar light curves can provide important clues about the central engine, including the possible presence of supermassive binary black holes (SMBBHs) and jet dynamics. Here, we present a preliminary analysis of the gamma-ray emission of the blazars PKS 1824-582 and PKS 2155-83 using Fermi-LAT observations. Our initial results reveal hints of QPOs with a period of ∼ 2 years and ∼4.5 years respectively, suggesting possible periodic processes in the jet or the presence of a binary supermassive black hole system. I will discuss if it is SMBBHs system then prediction of merger time and modelled characteristic strain of its expected gravitational wave emission.