The Detection of Possible γ-Ray Quasi-periodic Modulation with 600 days from the Blazar S2 0109+22
Abstract
In this work, we analyzed the long-term γ-ray data by a Fermi Large Area Telescope of blazar S2 0109+22, ranging from 2008 to 2023. The quasi-periodic oscillations (QPOs) of blazars aided in investigating the physical properties of internal supermassive black holes, the nature of variability, and the underlying radiation mechanism. We employed four different methods-Weighted Wavelet Z-transform, Lomb-Scargle periodogram, REDFIT and phase folded light curve analysis, for searching QPO signals. Our analysis identified a possible QPO behavior with a periodicity of ~600 days in 2013 November-2023 January at a significance level of ~3.5σ. This QPO signal sustained ~9 yr, corresponding to 5.6 cycles, which was in good agreement with the previously observed periodicity of ~657 days in radio. We explained this phenomenon based on the accretion model and the lighthouse effect, in a binary black hole system.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- June 2023
- DOI:
- 10.1088/1538-3873/acdf1f
- arXiv:
- arXiv:2306.11579
- Bibcode:
- 2023PASP..135f4102Z
- Keywords:
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- Active galactic nuclei;
- BL Lacertae objects;
- Galaxy jets;
- Gamma-rays;
- 16;
- 158;
- 601;
- 637;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 12 pages, 8 figures,3 tables,accepted for publication in PASP