Periodicity Analysis of Mrk 501 and Mrk 421 in Gamma Rays
R. Iotov*, A. Arbet-Engels, P. Arras, D. Baack, M. Balbo, A. Biland,
M. Boettcher, T. Bretz, J. Buss, D. Dorner, V. Eberle, L. Eisenberger, D. Elsaesser, T. Enßlin, D. Hildebrand, A. Kalenski, A. Kostić, M. Kreter, K. Mannheim, V. Marchenko, A. Mitchell, D. Neise, M. Noethe, A. Paravac, W. Rhode, B. Schleicher, V. Sliusar, M. Tarnopolski, F. Theissen, N. Żywucka and R. Walteret al. (click to show)
July 30, 2021
March 18, 2022
Blazars, a subclass of active galactic nuclei (AGNs), are highly variable objects. Quasiperiodic oscillations (QPOs), which might originate from a binary black hole located at the AGN core,have been found in some blazar light curves. For the blazars Mrk 421 and Mrk 501, we test the possible QPO behavior using a variety of methods (generalized Lomb-Scargle periodogram,continuous-time autoregressive moving average models, wavelet scalograms, and A−T plane), studying systematic effects in detail. We use gamma-ray light curves from FACT, a ground-based imaging air Cherenkov telescope. We report herein on a 3 sigma significant QPO in Mrk 421.
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