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| Autori principali: | , , , , |
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| Natura: | Preprint |
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2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2408.13052 |
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| _version_ | 1866914921486221312 |
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| author | Sharma, Ajay Banerjee, Anuvab Das, Avik Kumar Mandal, Avijit Bose, Debanjan |
| author_facet | Sharma, Ajay Banerjee, Anuvab Das, Avik Kumar Mandal, Avijit Bose, Debanjan |
| contents | We conducted a comprehensive variability analysis of the blazar PKS 2255-282 using Fermi-LAT observations spanning over four years, from MJD 57783.5 to 59358.5. Our analysis revealed a transient quasi-periodic oscillation (QPO) with a period of 93$\pm$2.6 days. We employed a variety of Fourier-based methods, including the Lomb-Scargle Periodogram (LSP) and Weighted Wavelet Z-Transform (WWZ), as well as time domain analysis techniques such as Seasonal and Non-Seasonal Autoregressive Integrated Moving Average (ARIMA) models and the Stochastic modeling with Stochastically Driven Damped Harmonic Oscillator (SHO) models. Consistently, the QPO with a period of 93 days was detected across all methods used. The observed peak in LSP and time-averaged WWZ plots has a significance level of 4.06$σ$ and 3.96$σ$, respectively. To understand the source of flux modulations in the light curve, we explored various physical models. A plausible scenario involves the precession of the jet with a high Lorentz factor or the movement of a plasma blob along a helical trajectory within the relativistic jet. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_13052 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Detection of a Transient Quasi-periodic Oscillation in $γ$-Rays from Blazar PKS 2255-282 Sharma, Ajay Banerjee, Anuvab Das, Avik Kumar Mandal, Avijit Bose, Debanjan High Energy Astrophysical Phenomena We conducted a comprehensive variability analysis of the blazar PKS 2255-282 using Fermi-LAT observations spanning over four years, from MJD 57783.5 to 59358.5. Our analysis revealed a transient quasi-periodic oscillation (QPO) with a period of 93$\pm$2.6 days. We employed a variety of Fourier-based methods, including the Lomb-Scargle Periodogram (LSP) and Weighted Wavelet Z-Transform (WWZ), as well as time domain analysis techniques such as Seasonal and Non-Seasonal Autoregressive Integrated Moving Average (ARIMA) models and the Stochastic modeling with Stochastically Driven Damped Harmonic Oscillator (SHO) models. Consistently, the QPO with a period of 93 days was detected across all methods used. The observed peak in LSP and time-averaged WWZ plots has a significance level of 4.06$σ$ and 3.96$σ$, respectively. To understand the source of flux modulations in the light curve, we explored various physical models. A plausible scenario involves the precession of the jet with a high Lorentz factor or the movement of a plasma blob along a helical trajectory within the relativistic jet. |
| title | Detection of a Transient Quasi-periodic Oscillation in $γ$-Rays from Blazar PKS 2255-282 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.13052 |