WMAP5 and the Cluster Mass Function

Abstract

The recently revised cosmological constraints from the Five-Year WMAP data ameliorate previous tension between cosmological constraints from the microwave background and from cluster abundances. We demonstrate that the revised estimates of cosmological parameters are in excellent agreement with the mass function of X-ray clusters in the Sloan Digital Sky Survey. Velocity segregation between galaxies and the underlying dark matter could cause virial mass estimates to be biased, causing the mass scale of the mass function to be offset from the true value. Modest velocity segregation (${\sigma }_{gxy}/{\sigma }_{DM}$=1.13${}_{-0.05}^{+0.06}$) is sufficient to match the mass function to the Five-Year WMAP results. When the new WMAP results are combined with constraints from supernovae and baryon acoustic oscillations, there is no need for velocity segregation (${\sigma }_{gxy}/{\sigma }_{DM}$=1.05$\pm$0.05). This result agrees with expectations for velocity segregation from state-of-the-art numerical simulations of clusters. Together with the improved agreement between the new WMAP results and recent cosmic shear measurements, this result demonstrates that the amplitude of large-scale structure in the nearby universe matches that predicted from the structure seen in the microwave background. The new constraint we place on velocity segregation in clusters indicates that virial mass estimates for clusters are reasonably accurate. This result suggests that future cluster surveys will be able to probe both cosmological parameters and fundamental cluster physics.

4 pages, 2 color figures, submitted to ApJ Letters

References in corpus (40)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Mass function of dark matter halos
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Chandra sample of nearby relaxed galaxy clusters: mass, gas fraction, and mass-temperature relation
• The Fourth Data Release of the Sloan Digital Sky Survey
• The Mass Function of an X-Ray Flux-Limited Sample of Galaxy Clusters
• Clustering of Galaxies in a Hierarchical Universe: I. Methods and Results at z=0
• Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
• Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
• The Northern ROSAT All-Sky (NORAS) Galaxy Cluster Survey I: X-ray Properties of Clusters Detected as Extended X-ray Sources
• Testing X-ray Measurements of Galaxy Clusters with Cosmological Simulations
• Constraints on Cosmological Parameters from Future Galaxy Cluster Surveys
• Very weak lensing in the CFHTLS Wide: Cosmology from cosmic shear in the linear regime
• Virial Scaling of Massive Dark Matter Halos: Why Clusters Prefer a High Normalization Cosmology
• The ROSAT Brightest Cluster Sample (BCS) - IV. The extended sample
• Velocity and spatial biases in CDM subhalo distributions
• Clustering of Galaxies in a Hierarchical Universe: II. Evolution to High Redshift
• COSMOS: 3D weak lensing and the growth of structure
• CIRS: Cluster Infall Regions in the Sloan Digital Sky Survey I. Infall Patterns and Mass Profiles
• The ROSAT-ESO Flux Limited X-Ray (REFLEX) Galaxy Cluster Survey I: The Construction of the Cluster Sample
• The mass function
• On the efficiency and reliability of cluster mass estimates based on member galaxies
• Self Calibration in Cluster Studies of Dark Energy: Combining the Cluster Redshift Distribution, the Power Spectrum and Mass Measurements
• A New Measurement of the X-ray Temperature Function of Clusters of Galaxies
• Power spectrum normalization from the local abundance of rich clusters of galaxies
• Galaxies and subhaloes in LCDM galaxy clusters
• The Cluster Mass Function from Early SDSS Data: Cosmological Implications
• X-ray Temperatures for the EMSS High Redshift Cluster Sample: Constraints on Cosmology and the Dark Energy Equation of State
• The Mean and Scatter of the Velocity Dispersion-Optical Richness Relation for maxBCG Galaxy Clusters
• Mismatch between X-ray and emission-weighted temperatures in galaxy clusters: cosmological implications
• Heating of Intergalactic Gas and Cluster Scaling Relations
• Self-Consistency and Calibration of Cluster Number Count Surveys for Dark Energy
• Cosmological constraints from evolution of cluster baryon mass function at z~0.5
• Velocity distributions in clusters of galaxies
• The Virial Mass Function of Nearby SDSS Galaxy Clusters
• The galaxy cluster X-ray luminosity--gravitational mass relation in the light of the WMAP 3rd year data
• Galaxy orbits and the intracluster gas temperature in clusters

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