The hydrostatic mass bias in The Three Hundred clusters

TL;DR

This study uses simulated galaxy clusters to analyze the hydrostatic mass bias, its dependence on dynamical states, and its evolution during mergers, revealing no correlation with dynamical indicators and negative bias during mergers.

Contribution

It provides a comprehensive analysis of hydrostatic mass bias in simulated clusters, including its evolution during mergers and lack of dependence on dynamical state indicators.

Findings

No dependence of bias on dynamical state indicators.

Negative bias observed during merger phases.

Bias does not correlate with redshift or dynamical indicators.

Abstract

Hydrostatic equilibrium (HE) is often used in observations to estimate galaxy clusters masses. We use a set of almost 300 simulated clusters from The Three Hundred Project, to estimate the cluster HE mass and the bias deriving from it. We study the dependence of the bias on several dynamical state indicators across a redshift range from 0.07 to 1.3, finding no dependence between them. Moreover, we focus our attention on the evolution of the HE bias during the merger phase, where the bias even reaches negative values due to an overestimation of the mass with HE.