Modelling Baryonic Effects on Galaxy Cluster Mass Profiles

TL;DR

This paper introduces a physically motivated model of baryonic effects on galaxy cluster mass profiles, calibrated with simulations, to improve the accuracy of mass and cosmological parameter measurements from weak lensing data.

Contribution

It presents a new model that accounts for baryonic impacts on cluster concentration and mass accretion, calibrated with hydrodynamical simulations, aiding future cosmological analyses.

Findings

Model accurately captures baryonic effects on mass profiles.

Calibration with Omega500 simulations improves predictive power.

Enables better constraints on cosmological parameters.

Abstract

Gravitational lensing is a powerful probe of the mass distribution of galaxy clusters and cosmology. However, accurate measurements of the cluster mass profiles are limited by uncertainties in cluster astrophysics. In this work, we present a physically motivated model of baryonic effects on the cluster mass profiles, which self-consistently takes into account the impact of baryons on the concentration as well as mass accretion histories of galaxy clusters. We calibrate this model using the Omega500 hydrodynamical cosmological simulations of galaxy clusters with varying baryonic physics. Our model will enable us to simultaneously constrain cluster mass, concentration, and cosmological parameters using stacked weak lensing measurements from upcoming optical cluster surveys.