The local dark matter distribution in self-interacting dark matter halos

Abstract

We study the effects of dark matter self-interactions on the local dark matter distribution in selected Milky Way-like galaxies in the EAGLE hydrodynamical simulations. The simulations were run with two different self-interacting dark matter models, a constant and velocity-dependent self-interaction cross-section. We find that the local dark matter velocity distribution of the Milky Way-like halos in the simulations with dark matter self-interactions and baryons are generally similar to those extracted from cold collisionless dark matter simulations with baryons. In both cases, the local dark matter speed distributions agree well with their best fit Maxwellian distributions. Including baryons in the simulations with or without dark matter self-interactions increases the local dark matter density and shifts the dark matter speed distributions to higher speeds. To study the implications for direct detection, we compute the dark matter halo integrals obtained directly from the simulations and compare them to those obtained from the best fit Maxwellian velocity distribution. We find that a Maxwellian distribution provides a good fit to the halo integrals of most halos, without any significant difference between the results of different dark matter self-interaction models.

39 pages, 12 figures, 15 tables

References in corpus (16)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Properties of galaxies reproduced by a hydrodynamic simulation
• On the local dark matter density
• Too Big to Fail in the Local Group
• Constraining the Galaxy's dark halo with RAVE stars
• Evidence for dark matter in the inner Milky Way
• Annual Modulation of Dark Matter in the Presence of Streams
• A new determination of the local dark matter density from the kinematics of K dwarfs
• The local high velocity tail and the Galactic escape speed
• Dark Halos of M31 and the Milky Way
• Substructure of fuzzy dark matter haloes
• Unraveling the interplay between SIDM and baryons in MW halos: defining where baryons dictate heat transfer
• Notes on the Missing Satellites Problem
• Constraints on dark matter self-interaction from galactic core size

Cited by in corpus (7)

• The impact of baryonic potentials on the gravothermal evolution of self-interacting dark matter haloes
• Cosmological and idealized simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions
• Dark Matter Candidates and Searches
• 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
• Are there any extragalactic high speed dark matter particles in the Solar neighborhood?
• EDGES of the dark forest: A new absorption window into the composite dark matter and large scale structure