Autocorrelation function of the soft X-ray background produced by warm-hot gas in dark halos

Abstract

We calculate the angular two-point autocorrelation function (ACF) of the soft X-ray background (SXRB) produced by the warm-hot intergalactic medium (WHIM) associated with dark halos, motivated primarily by searching for missing baryons and distinguishing different physical processes of the WHIM in dark halos. We employ a purely analytic model for the halo population which is completely determined by the universal density profile and the Press-Schechter mass function. We then adopt a phenomenological approach to nongravitational processes of the WHIM such as preheating and radiative cooling. It shows that the power spectra of the SXRB predicted by three WHIM models, namely, the self-similar model, preheating model and cooling model demonstrate remarkably different signatures in both amplitude and shape, with the peak locations moving from 4X10^4 for the self-similar model to a smaller value of (3-5)X10^3 when nongravitational processes are taken into account. The corresponding ACFs for preheating and cooling models become shallower too as compared with the prediction of the self-similar model. This may permit an effective probe of the physical processes of the WHIM in massive halos in conjunction with the observationally determined power spectrum or ACF of the SXRB from diffuse WHIM. However, a direct comparison of our theoretical predictions with existing data (e.g. the ACF determined from ROSAT observations) is still difficult because of the dominant contribution of AGNs in the soft X-ray sky. We discuss briefly the implication of our results for resolving the missing baryon problem in the local universe.

arXiv comment18 pages, accepted for publication in ApJ

References in corpus (43)

• A Universal Density Profile from Hierarchical Clustering
• Profiles of dark haloes: evolution, scatter, and environment
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• An analytic model for the spatial clustering of dark matter haloes
• 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
• Resolving the extragalactic hard X-ray background
• XMM-Newton observation of the Lockman Hole; I. The X-ray Data
• The intragroup medium in loose groups of galaxies
• 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
• Chandra Discovery of a Tree in the X-ray Forest towards PKS 2155-304: the Local Filament?
• 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
• Chandra Detection of OVIII Ly-alpha Absorption from an Overdense Region in the Intergalactic Medium
• The effect of non--gravitational gas heating in groups and clusters of galaxies
• The Origin of the Cosmic Soft X-Ray Background: Optical Identification of an Extremely Deep ROSAT Survey
• Revealing the Warm-Hot Intergalactic Medium with OVI Absorption
• Hydrodynamic Simulation of the Cosmological X-ray Background
• Heating of the IGM
• The Chandra Deep Field North Survey. IX. Extended X-ray Sources
• Is There Still Room for Warm/Hot Gas? Simulating the X-ray Background Spectrum
• Warm-hot intergalactic baryons revealed
• 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 radiative cooling on the scale-dependence of global stellar and gas contents of groups and clusters of galaxies
• A Preliminary Detection of Arcminute Scale Cosmic Microwave Background Anisotropy with the BIMA Array
• On the Distribution of X-ray Surface Brightness from Diffuse Gas
• Missing baryons and the soft X-ray background
• The X-ray background from groups and clusters of galaxies
• Can radiative cooling and nongravitational heating explain simultaneously the global X-ray properties of clusters and the unresolved cosmic X-ray background ?
• The harmonic power spectrum of the soft X-ray background I. The data analysis
• Soft X-ray background fluctuations and large-scale structure in the Universe
• Measuring Feedback Using the Intergalactic Medium State and Evolution Inferred from the Soft X-ray Background

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