The first robust evidence showing a dark matter density spike around the supermassive black hole in OJ 287
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866913332793966592 |
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| author | Chan, Man Ho Lee, Chak Man |
| author_facet | Chan, Man Ho Lee, Chak Man |
| contents | Black hole dynamics suggests that dark matter would re-distribute near a supermassive black hole to form a density spike. However, no direct evidence of dark matter density spike around a supermassive black hole has been identified. In this letter, we present the first robust evidence showing a dark matter density spike around a supermassive black hole. We revisit the data of the well-known supermassive black hole binary OJ 287 and show that the inclusion of the dynamical friction due to a dark matter density spike around the supermassive black hole can satisfactorily account for the observed orbital decay rate. The derived spike index $γ_{\rm sp}=2.351^{+0.032}_{-0.045}$ gives an excellent agreement with the value $γ_{\rm sp}=2.333$ predicted by the benchmark model assuming an adiabatically growing supermassive black hole. This provides a strong verification of the canonical theory suggested two decades ago modeling the gravitational interaction between collisionless dark matter and supermassive black holes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_03751 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The first robust evidence showing a dark matter density spike around the supermassive black hole in OJ 287 Chan, Man Ho Lee, Chak Man Astrophysics of Galaxies Black hole dynamics suggests that dark matter would re-distribute near a supermassive black hole to form a density spike. However, no direct evidence of dark matter density spike around a supermassive black hole has been identified. In this letter, we present the first robust evidence showing a dark matter density spike around a supermassive black hole. We revisit the data of the well-known supermassive black hole binary OJ 287 and show that the inclusion of the dynamical friction due to a dark matter density spike around the supermassive black hole can satisfactorily account for the observed orbital decay rate. The derived spike index $γ_{\rm sp}=2.351^{+0.032}_{-0.045}$ gives an excellent agreement with the value $γ_{\rm sp}=2.333$ predicted by the benchmark model assuming an adiabatically growing supermassive black hole. This provides a strong verification of the canonical theory suggested two decades ago modeling the gravitational interaction between collisionless dark matter and supermassive black holes. |
| title | The first robust evidence showing a dark matter density spike around the supermassive black hole in OJ 287 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.03751 |