Presentation #117.20 in the session Time-Domain Astrophysics.
With its improved cadence and ability to take observation without being affected by seasonal or diurnal gaps, TESS has become an important instrument to observe active galactic nuclei (AGN) in optical. In AGN, optical variability is important as the accretion disk emits thermal radiations in this waveband. In this work, We will discuss the characteristic timescales displayed by AGN selected from the X-ray surveys done by the instruments like ROSAT and XMM-Newton. We will also show the possible correlation of timing properties found by our studies with the black hole properties such as its mass and spin which is already known from these X-ray surveys. We will also report any possible periodicity found during our analysis and the theoretical explanation for the origin of such oscillations.