Abstract
The assumption of 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.
Highlights
Galaxy clusters are the most massive, gravitationally bound structures in the Universe and they are a powerful tool in cosmology
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
One way to estimate this mass is through X-rays and SZ (Sunyaev-Zeldovich) e↵ect, from which the temperature, density and pressure profiles of the hot gas between the galaxies (Intra Cluster Medium, ICM) are extracted, the assumption of hydrostatic equilibrium (HE) has to be made in order to estimate their mass [6]
Summary
Galaxy clusters are the most massive, gravitationally bound structures in the Universe and they are a powerful tool in cosmology. One way to estimate this mass is through X-rays and SZ (Sunyaev-Zeldovich) e↵ect, from which the temperature, density and pressure profiles of the hot gas between the galaxies (Intra Cluster Medium, ICM) are extracted, the assumption of hydrostatic equilibrium (HE) has to be made in order to estimate their mass [6]. This method usually leads to an underestimation of the mass, as shown in numerical simulations [8]. The presence of a correlation between hydrostatic mass bias and cluster dynamic state is still a matter of debate [7, 17], in this work we seek to understand this in detail by looking directly to the bias change along the evolution of major-merger events
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