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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2311.03296 |
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| _version_ | 1866909404624846848 |
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| author | Chashkina, Anna Bromberg, Omer Levinson, Amir Nakar, Ehud |
| author_facet | Chashkina, Anna Bromberg, Omer Levinson, Amir Nakar, Ehud |
| contents | Context: Some apparently quiescent supermassive black holes (BHs) at centers of galaxies show quasi-periodic eruptions (QPEs) in the X-ray band, the nature of which is still unknown. A possible origin for the eruptions is an accretion disk, however the properties of such disks are restricted by the timescales of reccurance and durations of the flares. Aims: In this work we test the possibility that the known QPEs can be explained by accretion from a compact accretion disk with an outer radius $r_{\rm out}\sim 10-40 r_{\rm g}$, focusing on a particular object GSN 069. Methods: We run several 3D GRMHD simulations with the {\tt HARMPI} code of thin and thick disks and study how the initial disk parameters such as thickness, magnetic field configuration, magnetization and Kerr parameter affect the observational properties of QPEs. Results: We show that accretion onto a slowly rotating BH through a small, thick accretion disk with an initially low plasma $β$ can explain the observed flare duration, the time between outbursts and the lack of evidence for a variable jet emission. In order to form such a disk the accreting matter should have a low net angular momentum. A potential source for such low angular momentum matter with a quasi periodic feeding mechanism might be a tight binary of wind launching stars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_03296 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Constraints on the accretion properties of quasi-periodic erupters from GRMHD simulations Chashkina, Anna Bromberg, Omer Levinson, Amir Nakar, Ehud High Energy Astrophysical Phenomena Context: Some apparently quiescent supermassive black holes (BHs) at centers of galaxies show quasi-periodic eruptions (QPEs) in the X-ray band, the nature of which is still unknown. A possible origin for the eruptions is an accretion disk, however the properties of such disks are restricted by the timescales of reccurance and durations of the flares. Aims: In this work we test the possibility that the known QPEs can be explained by accretion from a compact accretion disk with an outer radius $r_{\rm out}\sim 10-40 r_{\rm g}$, focusing on a particular object GSN 069. Methods: We run several 3D GRMHD simulations with the {\tt HARMPI} code of thin and thick disks and study how the initial disk parameters such as thickness, magnetic field configuration, magnetization and Kerr parameter affect the observational properties of QPEs. Results: We show that accretion onto a slowly rotating BH through a small, thick accretion disk with an initially low plasma $β$ can explain the observed flare duration, the time between outbursts and the lack of evidence for a variable jet emission. In order to form such a disk the accreting matter should have a low net angular momentum. A potential source for such low angular momentum matter with a quasi periodic feeding mechanism might be a tight binary of wind launching stars. |
| title | Constraints on the accretion properties of quasi-periodic erupters from GRMHD simulations |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2311.03296 |