QPOs from the Viscous Transonic Accretion Flow Around a Spinning Black Hole
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Debnath, Sanjit Chattopadhyay, Indranil Mandal, Soumyadip Joshi, Raj Kishor Tripathi, Priyesh Kumar Khan, M. Saleem |
| author_facet | Debnath, Sanjit Chattopadhyay, Indranil Mandal, Soumyadip Joshi, Raj Kishor Tripathi, Priyesh Kumar Khan, M. Saleem |
| contents | We investigate the dynamics of transonic advective accretion flows around spinning black holes in the presence of viscosity. The spacetime of a Kerr black hole is approximated using a pseudo-potential. We study viscously driven shock oscillations over a range of black hole spin parameters. Our results show that the frequency range of quasi-periodic oscillations (QPOs) obtained from the power density spectra depends strongly on the black hole spin. Low-spin systems predominantly exhibit low-frequency QPOs, whereas rapidly rotating black holes (greater than 0.9 Kerr parameter) produce QPOs spanning a broad range from low to high frequencies, comparable to those observed in black hole X-ray binaries. We further obtain a correlation between the QPO frequency and the power-law photon index by computing the spectrum for a 10 solar mass black hole. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_19692 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | QPOs from the Viscous Transonic Accretion Flow Around a Spinning Black Hole Debnath, Sanjit Chattopadhyay, Indranil Mandal, Soumyadip Joshi, Raj Kishor Tripathi, Priyesh Kumar Khan, M. Saleem High Energy Astrophysical Phenomena We investigate the dynamics of transonic advective accretion flows around spinning black holes in the presence of viscosity. The spacetime of a Kerr black hole is approximated using a pseudo-potential. We study viscously driven shock oscillations over a range of black hole spin parameters. Our results show that the frequency range of quasi-periodic oscillations (QPOs) obtained from the power density spectra depends strongly on the black hole spin. Low-spin systems predominantly exhibit low-frequency QPOs, whereas rapidly rotating black holes (greater than 0.9 Kerr parameter) produce QPOs spanning a broad range from low to high frequencies, comparable to those observed in black hole X-ray binaries. We further obtain a correlation between the QPO frequency and the power-law photon index by computing the spectrum for a 10 solar mass black hole. |
| title | QPOs from the Viscous Transonic Accretion Flow Around a Spinning Black Hole |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2604.19692 |