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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2504.05867 |
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| _version_ | 1866908306924109824 |
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| author | Sharma, Ajay Prince, Raj Bose, Debanjan |
| author_facet | Sharma, Ajay Prince, Raj Bose, Debanjan |
| contents | We report the detection of a potential quasi-periodic signal with a period of $\sim2$ years in the blazar ON 246, based on Fermi-LAT ($γ$-rays) and ASAS-SN (optical) observations spanning 11.5 years (MJD 55932-60081). We applied various techniques to investigate periodic signatures in the light curves, including the Lomb-Scargle periodogram (LSP), Weighted Wavelet Z-transform (WWZ), and REDFIT. The significance of the signals detected in LSP and WWZ was assessed using two independent approaches: Monte Carlo simulations and red noise modeling. Our analysis revealed a dominant peak in the $γ$-ray and optical light curves, with a significance level exceeding 3$σ$ in both LSP and WWZ, consistently persisting throughout the observation period. Additionally, the REDFIT analysis confirmed the presence of a quasi-periodic signal at $\sim$0.00134 $day^{-1}$ with a 99% confidence threshold. To explain the observed quasi-periodic variations in $γ$-ray and optical emissions, we explored various potential physical mechanisms. Our analysis suggests that the detected periodicity could originate from a supermassive binary black hole (SMBBH) system or the jet-induced orbital motion within such a system. Based on variability characteristics, we estimated the black hole mass of ON 246. The study suggests that the mass lies within the range of approximately $(0.142 - 8.22) \times 10^9 \ M_{\odot}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_05867 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Searching for quasi periodic oscillations in optical and $γ$-ray emissions $\&$ black hole mass estimation of blazar ON 246 Sharma, Ajay Prince, Raj Bose, Debanjan High Energy Astrophysical Phenomena We report the detection of a potential quasi-periodic signal with a period of $\sim2$ years in the blazar ON 246, based on Fermi-LAT ($γ$-rays) and ASAS-SN (optical) observations spanning 11.5 years (MJD 55932-60081). We applied various techniques to investigate periodic signatures in the light curves, including the Lomb-Scargle periodogram (LSP), Weighted Wavelet Z-transform (WWZ), and REDFIT. The significance of the signals detected in LSP and WWZ was assessed using two independent approaches: Monte Carlo simulations and red noise modeling. Our analysis revealed a dominant peak in the $γ$-ray and optical light curves, with a significance level exceeding 3$σ$ in both LSP and WWZ, consistently persisting throughout the observation period. Additionally, the REDFIT analysis confirmed the presence of a quasi-periodic signal at $\sim$0.00134 $day^{-1}$ with a 99% confidence threshold. To explain the observed quasi-periodic variations in $γ$-ray and optical emissions, we explored various potential physical mechanisms. Our analysis suggests that the detected periodicity could originate from a supermassive binary black hole (SMBBH) system or the jet-induced orbital motion within such a system. Based on variability characteristics, we estimated the black hole mass of ON 246. The study suggests that the mass lies within the range of approximately $(0.142 - 8.22) \times 10^9 \ M_{\odot}$. |
| title | Searching for quasi periodic oscillations in optical and $γ$-ray emissions $\&$ black hole mass estimation of blazar ON 246 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.05867 |