Unveiling the periodic variability patterns of the X-ray emission from the blazar PG 1553+113
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866911834692386816 |
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| author | Aniello, Tommaso Antonelli, Lucio Angelo Tombesi, Francesco Lamastra, Alessandra Middei, Riccardo Perri, Matteo Saturni, Francesco Gabriele Stamerra, Antonio Verrecchia, Francesco |
| author_facet | Aniello, Tommaso Antonelli, Lucio Angelo Tombesi, Francesco Lamastra, Alessandra Middei, Riccardo Perri, Matteo Saturni, Francesco Gabriele Stamerra, Antonio Verrecchia, Francesco |
| contents | The search for periodicity in the multi-wavelength high variable emission of blazars is a key feature to understand dynamical processes at work in this class of active galactic nuclei. The blazar PG 1553+113 is an attractive target due to the evidence of periodic oscillations observed at different wavelengths, with a solid proof of a 2.2-year modulation detected in the $γ$-ray, UV and optical bands. We aim at investigating the variability pattern of the PG 1553+113 X-ray emission using a more than 10-years long light curve, in order to robustly assess the presence or lack of a periodic behavior whose evidence is only marginal so far. We conducted detailed statistical analyses, studying in particular the variability properties of the X-ray emission of PG 1553+113 by computing the Lomb-Scargle periodograms, which are suited for the analyses of unevenly sampled time series, and adopting epoch folding techniques. We find out a modulation pattern in the X-ray light curve of PG 1553+113 with a period of $\sim$1.4 years, about 35% shorter than the one observed in the $γ$-ray domain. Our finding is in agreement with the recent spectro-polarimetric analyses and supports the presence of more dynamical phenomena simultaneously at work in the central engine of this quasar. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07089 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Unveiling the periodic variability patterns of the X-ray emission from the blazar PG 1553+113 Aniello, Tommaso Antonelli, Lucio Angelo Tombesi, Francesco Lamastra, Alessandra Middei, Riccardo Perri, Matteo Saturni, Francesco Gabriele Stamerra, Antonio Verrecchia, Francesco High Energy Astrophysical Phenomena Astrophysics of Galaxies The search for periodicity in the multi-wavelength high variable emission of blazars is a key feature to understand dynamical processes at work in this class of active galactic nuclei. The blazar PG 1553+113 is an attractive target due to the evidence of periodic oscillations observed at different wavelengths, with a solid proof of a 2.2-year modulation detected in the $γ$-ray, UV and optical bands. We aim at investigating the variability pattern of the PG 1553+113 X-ray emission using a more than 10-years long light curve, in order to robustly assess the presence or lack of a periodic behavior whose evidence is only marginal so far. We conducted detailed statistical analyses, studying in particular the variability properties of the X-ray emission of PG 1553+113 by computing the Lomb-Scargle periodograms, which are suited for the analyses of unevenly sampled time series, and adopting epoch folding techniques. We find out a modulation pattern in the X-ray light curve of PG 1553+113 with a period of $\sim$1.4 years, about 35% shorter than the one observed in the $γ$-ray domain. Our finding is in agreement with the recent spectro-polarimetric analyses and supports the presence of more dynamical phenomena simultaneously at work in the central engine of this quasar. |
| title | Unveiling the periodic variability patterns of the X-ray emission from the blazar PG 1553+113 |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.07089 |