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This content will become publicly available on June 8, 2019

Title: Probing Self-interacting Dark Matter with Disk Galaxies in Cluster Environments

Self-interacting dark matter (SIDM) has long been proposed as a solution to small-scale problems posed by standard cold dark matter. We use numerical simulations to study the effect of dark matter interactions on the morphology of disk galaxies falling into galaxy clusters. The effective drag force on dark matter leads to offsets of the stellar disk with respect to the surrounding halo, causing distortions in the disk. For anisotropic scattering cross sections of 0.5 and $$1.0\,{\mathrm{cm}}^{2}\,{{\rm{g}}}^{-1}$$, we show that potentially observable warps, asymmetries, and thickening of the disk occur in simulations. In conclusion, we discuss observational tests of SIDM with galaxy surveys and more realistic simulations needed to obtain detailed predictions.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States); Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  4. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States); Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 860; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; astroparticle physics; dark matter; galaxies: clusters: general; galaxies: structure
OSTI Identifier:
1460991