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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.12860 |
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| _version_ | 1866916103492468736 |
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| author | Prokhorenko, S. A. Sazonov, S. Yu. Gilfanov, M. R. Balashev, S. A. Bikmaev, I. F. Ivanchik, A. V. Medvedev, P. S. Starobinsky, A. A. Sunyaev, R. A |
| author_facet | Prokhorenko, S. A. Sazonov, S. Yu. Gilfanov, M. R. Balashev, S. A. Bikmaev, I. F. Ivanchik, A. V. Medvedev, P. S. Starobinsky, A. A. Sunyaev, R. A |
| contents | We examine the long-term (rest-frame time scales from a few months to $\sim 20$ years) X-ray variability of a sample of 2344 X-ray bright quasars from the SDSS DR14Q Catalogue, based on the data of the SRG/eROSITA All-Sky Survey complemented for $\sim 7$% of the sample by archival data from the XMM-Newton Serendipitous Source Catalogue. We characterise variability by a structure function, $SF^2(Δt)$. We confirm the previously known anti-correlation of the X-ray variability amplitude with luminosity. We also study the dependence of X-ray variability on black hole mass, $M_{\rm BH}$, and on an X-ray based proxy of the Eddington ratio, $λ_{\rm X}$. Less massive black holes prove to be more variable for given Eddington ratio and time scale. X-ray variability also grows with decreasing Eddington ratio and becomes particularly strong at $λ_{\rm X}$ of less than a few per cent. We confirm that the X-ray variability amplitude increases with increasing time scale. The $SF^2(Δt)$ dependence can be satisfactorily described by a power law, with the slope ranging from $\sim 0$ to $\sim 0.4$ for different ($M_{\rm BH}$, $λ_{\rm X}$) subsamples (except for the subsample with the lowest black hole mass and lowest Eddington ratio, where it is equal to $1.1\pm 0.4$) |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_12860 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | X-Ray Variability of SDSS Quasars Based on the SRG/eROSITA All-Sky Survey Prokhorenko, S. A. Sazonov, S. Yu. Gilfanov, M. R. Balashev, S. A. Bikmaev, I. F. Ivanchik, A. V. Medvedev, P. S. Starobinsky, A. A. Sunyaev, R. A High Energy Astrophysical Phenomena We examine the long-term (rest-frame time scales from a few months to $\sim 20$ years) X-ray variability of a sample of 2344 X-ray bright quasars from the SDSS DR14Q Catalogue, based on the data of the SRG/eROSITA All-Sky Survey complemented for $\sim 7$% of the sample by archival data from the XMM-Newton Serendipitous Source Catalogue. We characterise variability by a structure function, $SF^2(Δt)$. We confirm the previously known anti-correlation of the X-ray variability amplitude with luminosity. We also study the dependence of X-ray variability on black hole mass, $M_{\rm BH}$, and on an X-ray based proxy of the Eddington ratio, $λ_{\rm X}$. Less massive black holes prove to be more variable for given Eddington ratio and time scale. X-ray variability also grows with decreasing Eddington ratio and becomes particularly strong at $λ_{\rm X}$ of less than a few per cent. We confirm that the X-ray variability amplitude increases with increasing time scale. The $SF^2(Δt)$ dependence can be satisfactorily described by a power law, with the slope ranging from $\sim 0$ to $\sim 0.4$ for different ($M_{\rm BH}$, $λ_{\rm X}$) subsamples (except for the subsample with the lowest black hole mass and lowest Eddington ratio, where it is equal to $1.1\pm 0.4$) |
| title | X-Ray Variability of SDSS Quasars Based on the SRG/eROSITA All-Sky Survey |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.12860 |