A disturbing FABLE of mergers, feedback, turbulence, and mass biases in simulated galaxy clusters

Abstract

The use of galaxy clusters as cosmological probes often relies on understanding the properties and evolution of the intracluster medium (ICM). However, the ICM is a complex plasma, regularly stirred by mergers and feedback, with non-negligible bulk and turbulent motions and a non-thermal pressure component, making it difficult to construct a coherent and comprehensive picture. To this end, we use the FABLE simulations to investigate how the hydrostatic mass bias is affected by mergers, turbulence, and feedback. Following in detail a single, massive cluster we find the bias varies significantly over cosmic time, rarely staying at the average value found at a particular epoch. Variations of the bias at a given radius are contemporaneous with periods where outflows dominate the mass flux, either due to mergers or interestingly, at high redshift, AGN feedback. The $z=0$ ensemble median mass bias in FABLE is $\sim 13$ per cent at $R_{500}$ and $\sim 15$ per cent at $R_{200}$, but with a large scatter in individual values. In halo central regions, we see an increase in temperature and a decrease in non-thermal pressure support with cosmic time as turbulence thermalises, leading to a reduction in the mass bias within $\sim 0.2R_{200}$. When using a fitted pressure profile, instead of the simulation data, to estimate the bias, we find there can be significant differences, particularly at larger radii and higher redshift. We therefore caution over the use of such fits in future work when comparing with the next generation of X-ray and SZ observations.

16 pages, 7 figures, MNRAS accepted

References in corpus (22)

• Array Programming with NumPy
• Introducing the Illustris Project: the evolution of galaxy populations across cosmic time
• The Illustris simulation: the evolving population of black holes across cosmic time
• The Quiescent Intracluster Medium in the Core of the Perseus Cluster
• Systematics in the X-ray Cluster Mass Estimators
• The galaxy cluster mass scale and its impact on cosmological constraints from the cluster population
• The Atacama Cosmology Telescope: Modeling the Gas Thermodynamics in BOSS CMASS galaxies from Kinematic and Thermal Sunyaev-Zel'dovich Measurements
• Turbulence and Vorticity in Galaxy Clusters Generated by Structure Formation
• The impact of baryons on massive galaxy clusters: halo structure and cluster mass estimates
• Pressure of the hot gas in simulations of galaxy clusters
• Shock finding on a moving-mesh: I. Shock statistics in non-radiative cosmological simulations
• A little FABLE: exploring AGN feedback in dwarf galaxies with cosmological simulations
• Exploring the hydrostatic mass bias in MUSIC clusters: application to the NIKA2 mock sample
• The Three Hundred Project: correcting for the hydrostatic-equilibrium mass bias in X-ray and SZ surveys
• Blandford-Znajek jets in galaxy formation simulations: method and implementation
• Resolving shocks and filaments in galaxy formation simulations: effects on gas properties and star formation in the circumgalactic medium
• AGN jet feedback on a moving mesh: gentle cluster heating by weak shocks and lobe disruption
• Iron in X-COP: tracing enrichment in cluster outskirts with high accuracy abundance profiles
• Characterizing hydrostatic mass bias with Mock-X
• Hydrostatic mass estimates of massive galaxy clusters: a study with varying hydrodynamics flavours and non-thermal pressure support
• The Three Hundred Project: the stellar and gas profiles
• The Lack of Non-Thermal Motions in Galaxy Cluster Cores

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