Pressure of the hot gas in simulations of galaxy clusters

Abstract

We analyze the radial pressure profiles, the ICM clumping factor and the Sunyaev-Zel'dovich (SZ) scaling relations of a sample of simulated galaxy clusters and groups identified in a set of hydrodynamical simulations based on an updated version of the TreePM-SPH GADGET-3 code. Three different sets of simulations are performed: the first assumes non-radiative physics, the others include, among other processes, AGN and/or stellar feedback. Our results are analyzed as a function of redshift, ICM physics, cluster mass and cluster cool-coreness or dynamical state. In general, the mean pressure profiles obtained for our sample of groups and clusters show a good agreement with X-ray and SZ observations. Simulated cool-core (CC) and non-cool-core (NCC) clusters also show a good match with real data. We obtain in all cases a small (if any) redshift evolution of the pressure profiles of massive clusters, at least back to z=1. We find that the clumpiness of gas density and pressure increases with the distance from the cluster center and with the dynamical activity. The inclusion of AGN feedback in our simulations generates values for the gas clumping (${\sqrt{C}}_{\rho }\sim 1.2$ at $R_{200}$) in good agreement with recent observational estimates. The simulated $Y_{SZ}-M$ scaling relations are in good accordance with several observed samples, especially for massive clusters. As for the scatter of these relations, we obtain a clear dependence on the cluster dynamical state, whereas this distinction is not so evident when looking at the subsamples of CC and NCC clusters.

22 pages, 14 figures, 2 tables. Submitted to MNRAS

References in corpus (22)

• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• Testing X-ray Measurements of Galaxy Clusters with Cosmological Simulations
• Chemical enrichment of galaxy clusters from hydrodynamical simulations
• Systematics in the X-ray Cluster Mass Estimators
• Baryons at the Edge of the X-ray Brightest Galaxy Cluster
• The Representative XMM-Newton Cluster Structure Survey (REXCESS) of an X-ray Luminosity Selected Galaxy Cluster Sample
• Calibration of the galaxy cluster M_500-Y_X relation with XMM-Newton
• Total mass biases in X-ray galaxy clusters
• A refined sub-grid model for black hole accretion and AGN feedback in large cosmological simulations
• The MUSIC of CLASH: predictions on the concentration-mass relation
• Chaotic cold accretion on to black holes in rotating atmospheres
• The relation between gas density and velocity power spectra in galaxy clusters: high-resolution hydrodynamic simulations and the role of conduction
• The Redshift Evolution of the Mean Temperature, Pressure, and Entropy Profiles in 80 SPT-Selected Galaxy Clusters
• Simulated X-ray galaxy clusters at the virial radius: slopes of the gas density, temperature and surface brightness profiles
• Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA
• LoCuSS: A Comparison of Sunyaev-Zel'dovich Effect and Gravitational Lensing Measurements of Galaxy Clusters
• Galaxy Cluster Scaling Relations between Bolocam Sunyaev-Zel'dovich Effect and Chandra X-ray Measurements
• XMM-Newton study of 0.012<z<0.024 groups. I: Overview of the IGM thermodynamics
• Cosmological simulations of galaxy clusters with feedback from active galactic nuclei: profiles and scaling relations
• Shaping the X-ray spectrum of galaxy clusters with AGN feedback and turbulence
• On the Cluster Physics of Sunyaev-Zel'dovich and X-ray Surveys IV: Characterizing Density and Pressure Clumping due to Infalling Substructures
• Sunyaev-Zel'dovich profiles and scaling relations: modelling effects and observational biases

Cited by in corpus (4)

• Pressure profiles of distant galaxy clusters in the Planck catalog
• Viscosity, pressure, and support of the gas in simulations of merging cool-core clusters
• Virgo: an unlikely cluster of galaxies because of its environment
• Infall near clusters of galaxies: comparing gas and dark matter velocity profiles