The gamma-ray and Optical Variability Analysis of the BL Lac Object 3FGL J0449.4-4350. (arXiv:2003.11280v1 [astro-ph.HE])

The gamma-ray and Optical Variability Analysis of the BL Lac Object 3FGL J0449.4-4350. (arXiv:2003.11280v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Yang_X/0/1/0/all/0/1">Xing Yang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yi_T/0/1/0/all/0/1">Tingfeng Yi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_Y/0/1/0/all/0/1">Yan Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_H/0/1/0/all/0/1">Huaizhen Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mao_L/0/1/0/all/0/1">Lisheng Mao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_H/0/1/0/all/0/1">Haiming Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ma_L/0/1/0/all/0/1">Li Ma</a>

We have assembled the historical light curves of the BL Lac Object 3FGL
J0449.4-4350 at optical and gamma-ray bands, the time spanning about 10 years,
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 (QPO) of ~450 days. Assuming it
originates from the helical motion jet in a supermassive binary black hole
(SMBBH) system undergoing major merger, we estimate the primary black hole mass
M~7.7*10^{9} M_sun. To explore the origin of the gamma-ray, we investigated the
optical-gamma-ray correlations using discrete correlation function (DCF)
method, and found that the correlation between the two bands is very
significant. This strong correlation tends to imply lepton self-synchro-Compton
(LSSC) model to produce the gamma-ray.

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