The diverse density profiles of galaxy clusters with self-interacting dark matter plus baryons

TL;DR

This paper presents the first simulations of galaxy clusters with both self-interacting dark matter and baryons, revealing greater diversity in density profiles and demonstrating the effectiveness of analytical Jeans modeling.

Contribution

It introduces the first combined SIDM and baryonic physics simulations of galaxy clusters and shows how baryon distributions influence dark matter profiles.

Findings

Greater diversity in density profiles compared to collisionless dark matter simulations.

Analytical Jeans modeling accurately predicts SIDM density profiles.

Diversity in halo properties is linked to baryon distribution.

Abstract

We present the first simulated galaxy clusters (M_200 > 10^14 Msun) with both self-interacting dark matter (SIDM) and baryonic physics. They exhibit a greater diversity in both dark matter and stellar density profiles than their counterparts in simulations with collisionless dark matter (CDM), which is generated by the complex interplay between dark matter self-interactions and baryonic physics. Despite variations in formation history, we demonstrate that analytical Jeans modelling predicts the SIDM density profiles remarkably well, and the diverse properties of the haloes can be understood in terms of their different final baryon distributions.