Gravothermal collapse of Self-Interacting Dark Matter halos as the Origin of Intermediate Mass Black Holes in Milky Way satellites

Abstract

Milky Way (MW) satellites exhibit a diverse range of internal kinematics, reflecting in turn a diverse set of subhalo density profiles. These profiles include large cores and dense cusps, which any successful dark matter model must explain simultaneously. A plausible driver of such diversity is self-interactions between dark matter particles (SIDM) if the cross section passes the threshold for the gravothermal collapse phase at the characteristic velocities of the MW satellites. In this case, some of the satellites are expected to be hosted by subhalos that are still in the classical SIDM core phase, while those in the collapse phase would have cuspy inner profiles, with a SIDM-driven intermediate mass black hole (IMBH) in the centre as a consequence of the runaway collapse. We develop an analytical framework that takes into account the cosmological assembly of halos and is calibrated to previous simulations; we then predict the timescales and mass scales ($M_{\mathrm{BH}}$) for the formation of IMBHs in velocity-dependent SIDM (vdSIDM) models as a function of the present-day halo mass, $M_0$. Finally, we estimate the region in the parameter space of the effective cross section and $M_0$ for a subclass of vdSIDM models that result in a diverse MW satellite population, as well as their corresponding fraction of SIDM-collapsed halos and those halos' inferred IMBH masses. We predict the latter to be in the range $0.1-1000{\mathrm{M}}_{\odot }$ with a $M_{\mathrm{BH}}-M_0$ relation that has a similar slope, but lower normalization, than the extrapolated empirical relation of super-massive black holes found in massive galaxies.

20 pages, 11 figures, published in PRD. Contact: [email protected]

References in corpus (16)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential
• Dwarf galaxies in CDM and SIDM with baryons: observational probes of the nature of dark matter
• Supermassive Black Holes from Ultra-Strongly Self-Interacting Dark Matter
• Orbital parameters of infalling satellite haloes in the hierarchical $\Lambda$CDM model
• Core-collapse, evaporation and tidal effects: the life story of a self-interacting dark matter subhalo
• Constraints on dark matter self-interaction from the internal density profiles of X-COP galaxy clusters
• Structure and kinematics of tidally limited satellite galaxies in LCDM
• Motivations for a Large Self-Interacting Dark Matter Cross Section from Milky Way Satellites
• TangoSIDM: Tantalizing models of Self-Interacting Dark Matter
• Dynamical analysis of the dark matter and central black hole mass in the dwarf spheroidal Leo I
• Constraining SIDM with halo shapes: revisited predictions from realistic simulations of early-type galaxies
• An upper limit on the mass of the black hole in Ursa Minor dwarf galaxy
• Dynamical Instability of Collapsed Dark Matter Halos
• X-ray morphology of cluster-mass haloes in self-interacting dark matter
• Matching the mass function of Milky Way satellites in competing dark matter models

Cited by in corpus (12)

• Strong Dark Matter Self-interactions Diversify Halo Populations within and surrounding the Milky Way
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• A Parametric Model for Self-Interacting Dark Matter Halos
• Endothermic self-interacting dark matter in Milky Way-like dark matter haloes
• Testing the parametric model for self-interacting dark matter using matched halos in cosmological simulations
• Exploring Self-Interacting Dark Matter Halos with Diverse Baryonic Distributions: A Parametric Approach
• Evolution of a black hole cluster in full general relativity
• Anisotropic strong lensing as a probe of dark matter self-interactions
• Gravothermalizing into primordial black holes, boson stars, and cannibal stars
• A Universal Analytic Model for Gravitational Lensing by Self-Interacting Dark Matter Halos
• Diversifying halo structures in two-component self-interacting dark matter models via mass segregation
• Black Hole Cold Brew: Fermi Degeneracy Pressure