The Signatures of Self-Interacting Dark Matter and Subhalo Disruption on Cluster Substructure

Abstract

The abundance, distribution and inner structure of satellites of galaxy clusters can be sensitive probes of the properties of dark matter. We run 30 cosmological zoom-in simulations with self-interacting dark matter (SIDM), with a velocity-dependent cross-section, to study the properties of subhalos within cluster-mass hosts. We find that the abundance of subhalos that survive in the SIDM simulations are suppressed relative to their cold dark matter (CDM) counterparts. Once the population of disrupted subhalos -- which may host orphan galaxies -- are taken into account, satellite galaxy populations in CDM and SIDM models can be reconciled. However, even in this case, the inner structure of subhalos are significantly different in the two dark matter models. We study the feasibility of using the weak lensing signal from the subhalo density profiles to distinguish between the cold and self-interacting dark matter while accounting for the potential contribution of orphan galaxies. We find that the effects of self-interactions on the density profile of subhalos can appear degenerate with subhalo disruption in CDM, when orphans are accounted for. With current error bars from the Subaru Hyper Suprime-Cam Strategic Program, we find that subhalos in the outskirts of clusters (where disruption is less prevalent) can be used to constrain dark matter physics. In the future, the Vera C. Rubin Observatory Legacy Survey of Space and Time will give precise measurements of the weak lensing profile and can be used to constrain ${\sigma }_T/m$ at the $\sim 1$ cm${}^2$ g${}^{-1}$ level at $v\sim 2000$ km s${}^{-1}$.

19 pages, 12 figures, to be submitted to ApJ

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• Cosmological and idealized simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions
• Astrophysical Tests of Dark Matter Self-Interactions
• Beyond the Ultra-deep Frontier Fields And Legacy Observations (BUFFALO): a high-resolution strong + weak-lensing view of Abell 370
• Introducing the AIDA-TNG project: galaxy formation in alternative dark matter models
• The Hateful Eight: Connecting Massive Substructures in Galaxy Clusters like Abell 2744 to their Dynamical Assembly State using the Magneticum Simulations
• SIDM Concerto: Compilation and Data Release of Self-interacting Dark Matter Zoom-in Simulations
• Subaru HSC weak lensing of SDSS redMaPPer cluster satellite galaxies: Empirical upper limit on orphan fractions
• The Three Hundred: $M_{sub}-V_{circ}$ relation
• Soft Scattering Evaporation of Dark Matter Subhalos by Inner Galactic Gases
• Constraining the Nature of Dark Matter from Tidal Radii of Cluster Galaxy Subhalos
• Cosmological simulations with rare and frequent dark matter self-interactions
• Calibrating the SIDM Gravothermal Catastrophe with N-body Simulations
• The Non-universal Pseudo Phase-Space Density Profiles of Symphony Host Halos
• The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters
• Galaxies in the central regions of simulated galaxy clusters
• AMICO galaxy clusters in KiDS-1000: Splashback radius from weak lensing and cluster-galaxy correlation function
• How non-thermal pressure impacts the modelling of star formation in galaxy formation simulations