Projected Axis Ratios of Galaxy Clusters in the Horizon-AGN Simulation: Impact of Baryon Physics and Comparison with Observations

TL;DR

This study analyzes the non-sphericity of galaxy clusters using Horizon-AGN simulations, highlighting the impact of baryon physics on cluster shapes and comparing results with observations to improve cosmological models.

Contribution

It demonstrates that baryonic physics significantly influences cluster non-sphericity and shows better agreement with observations than dark-matter only models.

Findings

Baryon physics affects dark matter distribution beyond the core.

Simulated axis ratio PDFs align better with observed X-ray clusters.

Methodology improves predictions of cluster shapes for cosmology.

Abstract

We characterize the non-sphericity of galaxy clusters by the projected axis ratio of spatial distribution of star, dark matter, and X-ray surface brightness (XSB). We select 40 simulated groups and clusters of galaxies with mass larger than 5E13 Msun from the Horizon simulation that fully incorporates the relevant baryon physics, in particular, the AGN feedback. We find that the baryonic physics around the central region of galaxy clusters significantly affects the non-sphericity of dark matter distribution even beyond the central region, approximately up to the half of the virial radius. Therefore it is very difficult to predict the the probability density function (PDF) of the projected axis ratio of XSB from dark-matter only N-body simulations as attempted in previous studies. Indeed we find that the PDF derived from our simulated clusters exhibits much better agreement with that from the observed X-ray clusters. This indicates that our present methodology to estimate the non-sphericity directly from the Horizon simulation is useful and promising. Further improvements in both numerical modeling and observational data will establish the non-sphericity of clusters as a cosmological test complementary to more conventional statistics based on spherically averaged quantities.