Can radiative cooling and nongravitational heating explain simultaneously the global X-ray properties of clusters and the unresolved cosmic X-ray background ?

Abstract

Using a simple analytic approach we address the question of whether radiative cooling, nongravitational heating and cooling plus heating models can simultaneously explain the observed global X-ray properties (entropy and X-ray luminosity distributions) of groups and clusters and the residual soft X-ray background (XRB) after discrete sources are removed. Within the framework of typical cold dark matter structure formation characterized by an amplitude of matter power spectrum sigma_8=0.9, it is argued that while radiative cooling alone is able to marginally reproduce the entropy floor detected in the central regions of groups and clusters, it is insufficient to account for the steepening of the X-ray luminosity - temperature relation for groups and the unresolved soft XRB. A phenomenological preheating model, in which either an extra specific energy budget or an entropy floor is added to the hot gas in groups and clusters, fails in the recovery of at least one of the X-ray observed features. Finally, the soft XRB predicted by our combined model of cooling plus heating exceeds the observational upper limits by a factor of ~2, if the model is required to reproduce the observed entropy and X-ray luminosity - temperature relationships of groups and clusters. If the discrepancy is not a result of the oversimplification of our analytic models, this implies that either our current understanding of the physical processes of the hot gas is still incomplete, or the normalization of the present power spectrum has been systematically overestimated. For the latter, both the X-ray properties of groups and clusters and the XRB predicted by preheating model and cooling plus heating model can be reconciled with the X-ray observations if a lower value of the normalization parameter sigma_8 \approx 0.7 is assumed.

14 pages, 6 figures, accepted for publication in ApJ

References in corpus (46)

• A Universal Density Profile from Hierarchical Clustering
• Large scale bias and the peak background split
• Profiles of dark haloes: evolution, scatter, and environment
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Where are the Baryons?
• Baryons in the Warm-Hot Intergalactic Medium
• The Chandra Deep Field South: the 1 Million Second
• First Results from the X-ray and Optical Survey of the Chandra Deep Field South
• The Imprint of Galaxy Formation on X-ray Clusters
• The Evolution of X-ray Clusters and the Entropy of the Intra Cluster Medium
• Resolving the extragalactic hard X-ray background
• XMM-Newton observation of the Lockman Hole; I. The X-ray Data
• A ROSAT survey of Hickson's compact galaxy groups
• The intragroup medium in loose groups of galaxies
• Revisiting the Cosmic Cooling Crisis
• The Chandra Deep Survey of the Hubble Deep Field North Area. II. Results from the Caltech Faint Field Galaxy Redshift Survey Area
• The entropy and energy of intergalactic gas in galaxy clusters
• Non-Gravitational Heating in the Hierarchical Formation of X-ray Clusters
• The Lx-T, Lx-sigma and sigma-T relations for groups and clusters of galaxies
• Modified-Entropy Models for the Intracluster Medium
• New Results from the X-ray and Optical Survey of the Chandra Deep Field South: The 300ks Exposure
• The Lx-T and Lx-sigma Relationships for Galaxy Clusters Revisited
• Regulation of the X-ray luminosity of clusters of galaxies by cooling and supernova feedback
• Pre-Heated Isentropic Gas in Groups of Galaxies
• Physical Implications of the X-ray Properties of Galaxy Groups and Clusters
• The Effect of Cooling and Preheating on the X-ray Properties of Clusters of Galaxies
• The effect of non--gravitational gas heating in groups and clusters of galaxies
• The Luminosity-Temperature Relation for Groups and Clusters of Galaxies
• The effect of radiative cooling on scaling laws of X-ray groups and clusters
• Cosmic Shear and Power Spectrum Normalization with the Hubble Space Telescope
• The Impact of Galaxy Formation on the X-ray Evolution of Clusters
• 2-8 keV X-ray number counts determined from Chandra blank field observations
• The Origin of the Cosmic Soft X-Ray Background: Optical Identification of an Extremely Deep ROSAT Survey
• Diffuse Baryons in Groups and Clusters of Galaxies
• Hydrodynamic Simulation of the Cosmological X-ray Background
• Heating of the IGM
• The Chandra Deep Field North Survey. IX. Extended X-ray Sources
• The Mass-Temperature Relation of 22 Nearby Clusters
• Is There Still Room for Warm/Hot Gas? Simulating the X-ray Background Spectrum
• The soft X-ray background: evidence for widespread disruption of the gas halos of galaxy groups
• The X-ray surface brightness distribution from diffuse gas
• Reexamination of the galaxy formation-regulated gas evolution model in groups and clusters
• The effect of supernova heating on cluster properties and constraints on galaxy formation models
• The Effect of radiative cooling on the scale-dependence of global stellar and gas contents of groups and clusters of galaxies
• On the Distribution of X-ray Surface Brightness from Diffuse Gas
• The X-ray background from groups and clusters of galaxies

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• X-ray Emission of Baryonic Gas in the Universe: Luminosity-Temperature Relationship and Soft-Band Background
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