The Onset of Gravothermal Core Collapse in Velocity Dependent Self-Interacting Dark Matter Subhaloes

Abstract

It has been proposed that gravothermal collapse due to dark matter self-interactions (i.e. self-interacting dark matter, SIDM) can explain the observed diversity of the Milky Way (MW) satellites' central dynamical masses. We investigate the process behind this hypothesis using an $N$-body simulation of a MW-analogue halo with velocity dependent self-interacting dark matter (vdSIDM) in which the low velocity self-scattering cross-section, ${\sigma }_T/m_x$, reaches 100 cm${}^2$g${}^{-1}$; we dub this model the vd100 model. We compare the results of this simulation to simulations of the same halo that employ different dark models, including cold dark matter (CDM) and other, less extreme SIDM models. The masses of the vd100 haloes are very similar to their CDM counterparts, but the values of their maximum circular velocities, $V_{max}$, are significantly higher. We determine that these high $V_{max}$ subhaloes were objects in the mass range [$5\times 10^6$, $1\times 10^8$] $M_{\odot }$ at $z=1$ that undergo gravothermal core collapse. These collapsed haloes have density profiles that are described by single power laws down to the resolution limit of the simulation, and the inner slope of this density profile is approximately $-3$. Resolving the ever decreasing collapsed region is challenging, and tailored simulations will be required to model the runaway instability accurately at scales $<1$ kpc.

13 pages, 14 figures. Version accepted by MNRAS. Contact: [email protected]; doi: 10.1093/mnras/stab1725

References in corpus (8)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• The Observed properties of Dark Matter on small spatial scales
• Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential
• SubHaloes going Notts: The SubHalo-Finder Comparison Project
• Constraining Velocity-dependent Self-Interacting Dark Matter with the Milky Way's dwarf spheroidal galaxies
• The spatial distribution of Milky Way satellites, gaps in streams and the nature of dark matter
• Kinematics of the Tucana Dwarf Galaxy: An Unusually Dense Dwarf in the Local Group
• Gravothermal Catastrophe, an Example

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