Title: The impact of baryonic discs on the shapes and profiles of self-interacting dark matter haloes

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [2];  [2];  [3];  [4]
  1. Univ. of California, Riverside, CA (United States); DOE/OSTI
  2. Univ. of California, Riverside, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Univ. of Iceland, Reykjavik (Iceland)
+ Show Author Affiliations

We employ isolated N-body simulations to study the response of self-interacting dark matter (SIDM) haloes in the presence of the baryonic potentials. Dark matter self-interactions lead to kinematic thermalization in the inner halo, resulting in a tight correlation between the dark matter and baryon distributions. A deep baryonic potential shortens the phase of SIDM core expansion and triggers core contraction. This effect can be further enhanced by a large self-scattering cross-section. We find the final SIDM density profile is sensitive to the baryonic concentration and the strength of dark matter self-interactions. Assuming a spherical initial halo, we also study evolution of the SIDM halo shape together with the density profile. The halo shape at later epochs deviates from spherical symmetry due to the influence of the non-spherical disc potential, and its significance depends on the baryonic contribution to the total gravitational potential, relative to the dark matter one. In addition, we construct a multicomponent model for the Milky Way, including an SIDM halo, a stellar disc, and a bulge, and show it is consistent with observations from stellar kinematics and streams.

Research Organization:
Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0008541
OSTI ID:
1540623
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 479; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Observational evidence for self-interacting cold dark matter text January 1999
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Cited By (17)

The Multidimensional Milky Way preprint January 2019
Towards an improved model of self-interacting dark matter haloes journal December 2018
Simulations of core formation for frequent dark matter self-interactions journal May 2019
ETHOS – an Effective Theory of Structure Formation: detecting dark matter interactions through the Lyman-α forest journal May 2019
Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons journal July 2019
The Milky Way’s halo and subhaloes in self-interacting dark matter journal September 2019
Too big to fail in light of Gaia journal September 2019
Dwarf galaxies in CDM, WDM, and SIDM: disentangling baryons and dark matter physics journal September 2019
The interplay of self-interacting dark matter and baryons in shaping the halo evolution journal January 2019
Evaporating the Milky Way halo and its satellites with inelastic self-interacting dark matter journal February 2019
Reconciling the Diversity and Uniformity of Galactic Rotation Curves with Self-Interacting Dark Matter journal August 2019
Simulations of core formation for frequent dark matter self-interactions text January 2019
The Effect of Dark Matter–Dark Radiation Interactions on Halo Abundance: A Press–Schechter Approach journal March 2019
The effect of dark matter-dark radiation interactions on halo abundance -- a Press-Schechter approach text January 2018
Dwarf Galaxies in CDM, WDM, and SIDM: Disentangling Baryons and Dark Matter Physics text January 2018
The Milky Way's Halo and Subhalos in Self-Interacting Dark Matter text January 2019
Too Big To Fail in Light of Gaia text January 2019

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