Reproducing the entropy structure in galaxy groups

Abstract

We carry out a comparison between observations and hydrodynamic simulations of entropy profiles of groups and clusters of galaxies. We use the Tree+SPH GADGET code to simulate four halos of sizes in the M_500 = 1.0 - 16.e13 h^-1 Msun range, corresponding to poor groups up to Virgo-like clusters. We concentrate on the effect of introducing radiative cooling, star formation, and a variety of non-gravitational heating schemes on the entropy structure and the stellar fraction. We show that all the simulations result in a correct entropy profile for the Virgo-like cluster. With the heating energy budget of ~0.7 keV/particle injected at z_h=3, we are also able to reproduce the entropy profiles of groups. We obtain the flat entropy cores as a combined effect of preheating and cooling, while we achieve the high entropy at outskirts by preheating. The resulting baryon fraction locked into stars is in the 25-30% range, compared to 35-40% in the case of no preheating. Heating at higher redshift, z_h=9, strongly delays the star-formation, but fails to produce a sufficiently high specific entropy.

5 page, A&A in press

References in corpus (25)

• GADGET: A code for collisionless and gasdynamical cosmological simulations
• Cosmological Simulations with TreeSPH
• The 2dF Galaxy Redshift Survey: Near Infrared Galaxy Luminosity Functions
• Cosmological SPH simulations: The entropy equation
• The Lx-T Relation and Temperature Function for Nearby Clusters Revisited
• The Imprint of Galaxy Formation on X-ray Clusters
• The Evolution of X-ray Clusters and the Entropy of the Intra Cluster Medium
• Details of the mass--temperature relation for clusters of galaxies
• Early Metal Enrichment of the Intergalactic Medium by Pregalactic Outflows
• Revisiting the Cosmic Cooling Crisis
• Iron as a tracer in galaxy clusters and groups
• Modified-Entropy Models for the Intracluster Medium
• Regulation of the X-ray luminosity of clusters of galaxies by cooling and supernova feedback
• Effects of Preheating on X-ray Scaling Relations in Galaxy Clusters
• The Effect of Cooling and Preheating on the X-ray Properties of Clusters of Galaxies
• An ASCA Study of the Heavy Element Distribution in Clusters of Galaxies
• The effect of non--gravitational gas heating in groups and clusters of galaxies
• Temperature and Heavy Element Abundance Profiles of Cool Clusters of Galaxies from ASCA
• The Entropy-Driven X-ray Evolution of Galaxy Clusters
• The Impact of Galaxy Formation on the X-ray Evolution of Clusters
• Pre-heating the ICM in high resolution simulations: the effect on the gas entropy
• X-Ray Scaling Relations of Galaxy Groups in a Hydrodynamic Cosmological Simulation
• SNe heating and the chemical evolution of the intra-cluster medium
• ASCA observations of groups at radii of low overdensity. Implications for the cosmic preheating
• The History of Cosmic Baryons: X-ray Emission vs. Star Formation Rate

Cited by in corpus (18)

• X-ray properties of galaxy clusters and groups from a cosmological hydrodynamical simulation
• The Representative XMM-Newton Cluster Structure Survey (REXCESS) of an X-ray Luminosity Selected Galaxy Cluster Sample
• Cooling and heating the ICM in hydrodynamical simulations
• XMM-Newton discovery of an X-ray filament in Coma
• Entropy amplification from energy feedback in simulated galaxy groups and clusters
• XMM-Newton observations of three poor clusters: Similarity in dark matter and entropy profiles down to low mass
• The radial structure of galaxy groups and clusters
• XMM-Newton and Gemini Observations of Eight RASSCALS Galaxy Groups
• XMM-Newton study of 0.012<z<0.024 groups. I: Overview of the IGM thermodynamics
• Heating groups and clusters of galaxies: the role of AGN jets
• Entropy of gas and dark matter in galaxy clusters
• Role of clusters of galaxies in the evolution of the metal budget in the Universe
• Next Generation Virgo Cluster Survey. XXI. The weak lensing masses of the CFHTLS and NGVS RedGOLD galaxy clusters and calibration of the optical richness
• Implications of Halo Inside-out Growth on the X-Ray Properties of Nearby Galaxy Systems within the Preheating Scenario
• Excess entropy and energy feedback from within cluster cores up to r${}_{200}$
• Detection of Hot Gas in Galaxy Groups via the Sunyaev-Zel'dovich Effect
• Little evidence for entropy and energy excess beyond $r_{500}$ - An end to ICM preheating?
• AGN feedback with the Square Kilometer Array (SKA) and implications for cluster physics and cosmology