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

Lucas F. Secco, Amanda Farah, Bhuvnesh Jain, Susmita Adhikari, Arka Banerjee, Neal Dalal

Research output: Contribution to journalArticlepeer-review

Abstract

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 cm2 g-1, we show that potentially observable warps, asymmetries, and thickening of the disk occur in simulations. We discuss observational tests of SIDM with galaxy surveys and more realistic simulations needed to obtain detailed predictions.

Original languageEnglish (US)
Article number32
JournalAstrophysical Journal
Volume860
Issue number1
DOIs
StatePublished - Jun 10 2018

Keywords

  • astroparticle physics
  • dark matter
  • galaxies: clusters: general
  • galaxies: structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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