Dianoga SIDM: galaxy cluster self-interacting dark matter simulations

Abstract

This work aims at assessing the impact of DM self-interactions on the properties of galaxy clusters. In particular, the goal is to study the angular dependence of the cross section by testing rare (large angle scattering) and frequent (small angle scattering) SIDM models with velocity-dependent cross sections. We re-simulate six galaxy cluster zoom-in initial conditions with a dark matter only run and with a full-physics setup simulations that includes a self-consistent treatment of baryon physics. We test the dark matter only setup and the full physics setup with either collisionless cold dark matter, rare self-interacting dark matter, and frequent self-interacting dark matter models. We then study their matter density profiles as well as their subhalo population. Our dark matter only SIDM simlations agree with theoretical models, and when baryons are included in simulations, our SIDM models substantially increase the central density of galaxy cluster cores compared to full-physics simulations using collisionless dark matter. SIDM subhalo suppression in full-physics simulations is milder compared to the one found in dark matter only simulations, because of the cuspier baryionic potential that prevent subhalo disruption. Moreover SIDM with small-angle scattering significantly suppress a larger number of subhaloes compared to large angle scattering SIDM models. Additionally, SIDM models generate a broader range of subhalo concentration values, including a tail of more diffuse subhaloes in the outskirts of galaxy clusters and a population of more compact subhaloes in the cluster cores.

14 pages, 15 figures, abstract abridged to fit arXiv character limit, submitted to Astronomy and Astrophysics

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Cited by in corpus (13)

• Introducing the AIDA-TNG project: galaxy formation in alternative dark matter models
• Imaging dark matter at the smallest scales with $z\approx 1$ lensed stars
• Numerical challenges for energy conservation in N-body simulations of collapsing self-interacting dark matter halos
• Self-Interacting Dark Matter, Core Collapse and the Galaxy-Galaxy Strong Lensing Discrepancy
• Dynamical friction from self-interacting dark matter
• SIDM Concerto: Compilation and Data Release of Self-interacting Dark Matter Zoom-in Simulations
• N-body simulations of dark matter-baryon interactions
• DARKSKIES: A suite of super-sampled zoom-in simulations of galaxy clusters with self-interacting dark matter
• Simulating realistic self-interacting dark matter models including small and large-angle scattering
• A high-resolution view of the source-plane magnification near cluster caustics in wave dark matter models
• Self-Interacting Dark Matter with Mass Segregation: A Unified Explanation of Dwarf Cores and Small-Scale Lenses
• MrMARTIAN: A Multi-resolution Mass Reconstruction Algorithm Combining Free-form and Analytic Components
• Accretion of self-interacting dark matter onto supermassive black holes