Bondi-Hoyle-Lyttleton accretion onto a rotating black hole with ultralight scalar hair
| Autor: | Cruz-Osorio, Alejandro, Rezzolla, Luciano, Lora-Clavijo, Fabio Duvan, Font, José Antonio, Herdeiro, Carlos, Radu, Eugen |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal of Cosmology and Astroparticle Physics 2023 (08), 057 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1475-7516/2023/08/057 |
| Popis: | We present a numerical study of relativistic Bondi-Hoyle-Lyttleton (BHL) accretion onto an asymptotically flat black hole with synchronized hair. The hair is sourced by an ultralight, complex scalar field, minimally coupled to Einstein's gravity. Our simulations consider a supersonic flow parametrized by the asymptotic values of the fluid quantities and a sample of hairy black holes with different masses, angular momenta, and amount of scalar hair. For all models, steady-state BHL accretion solutions are attained that are characterized by the presence of a shock-cone and a stagnation point downstream. For the models of the sample with the largest component of scalar field, the shock-cone envelops fully the black hole, transitioning into a bow-shock, and the stagnation points move further away downstream. Analytical expressions for the mass accretion rates are obtained after fitting the numerical results, which can be used to analyze black-hole formation scenarios in the presence of ultralight scalar fields. The formation of a shock-cone leads to regions where sound waves can be trapped and resonant oscillations excited. We measure the frequencies of such quasi-periodic oscillations and point out a possible association with quasi-periodic oscillations in the X-ray light curve of Sgr~A* and microquasars. Comment: 24 pages, 3 tables, 10 figures. Minor changes |
| Databáze: | arXiv |
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