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Mini-dark halos with intermediate mass black holes

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arxiv astro-ph/0501625 v3 pith:EM3BHRVM submitted 2005-01-28 astro-ph hep-ph

HongSheng Zhao , Joseph Silk This is my paper · ORCID
classification astro-phhep-ph
keywords imbhsminihalosdarkannihilationblackdenseenshroudedholes
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We argue that the Milky Way (MW) contains thousands intermediate mass black holes (IMBHs) and minihalos with a fraction of IMBHs still being enshrouded in extremely dense mini-spikes of dark matter (DM) particles. Each containing $10^6\msun$ of dark particles and no baryons in a sphere of 50 pc radius, the minihalos are dense enough to survive the Milky Way tide with the nearest minihalo within 2 kpc from the Sun. The IMBH is formed off-centre in a minihalo by gas accretion, and its growth adiabatically compresses a finite density of surrounding dark matter into a $r^{-1.5}$ mini-spike. Some IMBHs recentre on their minihalos after dynamical friction, and some IMBHs are ejected by birth kicks. Detectable by GLAST, the mini-spikes and minihalos should stand out the background and dominate the neutralino annihilation in the smooth MW and satellite galaxies. If they are the unidentified EGRET sources, upper limits can be set on the branching ratio of neutralino annihilation. The supermassive BH of the MW, if orginates from an IMBH, is also likely enshrouded with a mini-spike.

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Cited by 3 Pith papers

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  1. Extreme mass-ratio inspiral within an ultralight scalar cloud I. Scalar radiation

    gr-qc 2025-07 conditional novelty 6.0 of 10

    Scalar radiation from an EMRI in an ultralight scalar cloud is computed semi-analytically, showing dipole clouds decelerate and quadrupole clouds accelerate the inspiral, with up to about 100 rad dephasing after 18 months.

  2. Probing dark matter halo profiles with multi-band observations of gravitational waves

    gr-qc 2024-11 conditional novelty 6.0 of 10

    A Fisher-matrix forecast shows that the proposed deci-Hz space detector GWSat would constrain dark matter spike density and slope around intermediate-mass ratio inspirals to sub-percent accuracy, while third-generatio...

  3. Darkness Visible: N-Body Simulations of Dark Matter Spikes in Hernquist Haloes

    astro-ph.CO 2024-11 reject novelty 6.0 of 10

    N-body simulations of adiabatic black hole growth in Hernquist haloes yield an empirical spike profile with outer halo depletion and a mass-ratio-dependent spike radius that deviates from analytical predictions.

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