The γ-Ray and Optical Variability Analysis of the BL Lac Object 3FGL J0449.4-4350
Abstract
We have assembled the historical light curves of the BL Lac Object 3FGL J0449.4-4350 at optical and γ-ray bands, the time spanning about 10 yr, analyzed the periodic variability of the light curves by using four different methods (Lomb-Scargle periodogram, REDFIT38, Jurkevich and DACF). We detected a marginally possible quasi-periodic oscillation of ∼450 days. Assuming it originates from the helical motion jet in a supermassive binary black hole system undergoing major merger, we estimate the primary black hole mass M ∼ 7.7 × 109 M⊙. To explore the origin of the γ-ray, we investigated the optical-γ-ray correlations using discrete correlation function method, and found that the correlation between the two bands is very significant. This strong correlation tends to imply lepton self-synchro-Compton model to produce the γ-ray.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- April 2020
- DOI:
- 10.1088/1538-3873/ab779e
- arXiv:
- arXiv:2003.11280
- Bibcode:
- 2020PASP..132d4101Y
- Keywords:
-
- BL Lacertae objects: individual (3FGL J0449.4-4350);
- galaxies: jets;
- galaxies: nuclei;
- gamma rays: galaxies;
- galaxies: evolution;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 19 pages, 6 figures, 2 tables, Accepted for publication in PASP