Ejection of supermassive black holes and implications for merger rates in fuzzy dark matter haloes
| Autor: | Amr El-Zant, Joseph Silk, Zacharias Roupas |
|---|---|
| Přispěvatelé: | Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2020 |
| Předmět: |
Cold dark matter
Astrophysics::High Energy Astrophysical Phenomena Dark matter FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy merger 01 natural sciences dark matter 0103 physical sciences galaxies: formation 010306 general physics 010303 astronomy & astrophysics Axion galaxies: kinematics and dynamics Astrophysics::Galaxy Astrophysics Dwarf galaxy Physics Supermassive black hole Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy galaxies: haloes Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Halo galaxies: evolution [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 499 (2), pp.2575-2586. ⟨10.1093/mnras/staa2972⟩ |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa2972 |
| Popis: | Fuzzy dark matter (FDM) consisting of ultra-light axions has been invoked to alleviate galactic-scale problems in the cold dark matter scenario. FDM fluctuations, created via the superposition of waves, can impact the motion of a central supermassive black hole (SMBH) immersed in an FDM halo. The SMBH will undergo a random walk, induced by FDM fluctuations, that can result in its ejection from the central region. This effect is strongest in dwarf galaxies, accounting for wandering SMBHs and the low detection rate of AGN in dwarf spheroidal galaxies. In addition, a lower bound on the allowed axion masses is inferred both for Sagittarius $A^*$ and heavier SMBH; to avoid ejection from the galactic centres, axion masses of the order of $10^{-22}{\rm eV}$ or lighter are excluded. Stronger limits are inferred for merging galaxies. We find that the event rate of SMBH mergers in FDM haloes and the associated SMBH growth rates can be reduced by at least an order of magnitude. 13 pages, 7 figures (principal results in figs 3-5). To appear in MNRAS |
| Databáze: | OpenAIRE |
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