Now showing items 31-39 of 39
Studying dark energy with galaxy cluster surveys
(Elsevier Science Bv, 2003-07)
Galaxy cluster surveys provide a powerful means of studying the density and nature of the dark energy. The redshift distribution of detected clusters in a deep, large solid angle SZE or X-ray survey is highly sensitive to ...
Confusion of diffuse objects in the X-ray sky
(Univ Chicago Press, 2001-02-20)
Most of the baryons in the present-day universe are thought to reside in intergalactic space at temperatures of 10(5)-10(7) K. X-ray emission from these baryons contributes a modest (similar to 10%) fraction of the similar ...
Four measures of the intracluster medium temperature and their relation to a cluster's dynamical state
(Univ Chicago Press, 2001-01-01)
We employ an ensemble of 24 hydrodynamic cluster simulations to create spatially and spectrally resolved images of quality comparable to Chandra's expected performance. Emission from simulation mass elements is represented ...
Red-sequence cluster finding in the millennium simulation
(Blackwell Publishing, 2007-12-21)
We investigate halo mass selection properties of red-sequence cluster finders using galaxy populations of the Millennium Simulation ( MS). A clear red sequence exists for MS galaxies in massive haloes at redshifts z < 1, ...
The C4 clustering algorithm: clusters of galaxies in the Sloan Digital Sky Survey
(Univ Chicago Press, 2005-09)
We present the C4 Cluster Catalog, a new sample of 748 clusters of galaxies identified in the spectroscopic sample of the Second Data Release (DR2) of the Sloan Digital Sky Survey (SDSS). The C4 cluster-finding algorithm ...
The effect of gas physics on the halo mass function
(Blackwell Publishing Ltd, 2009-03-21)
Cosmological tests based on cluster counts require accurate calibration of the space density of massive haloes, but most calibrations to date have ignored complex gas physics associated with halo baryons. We explore the ...
The X-ray luminosity-mass relation for local clusters of galaxies
(Univ Chicago Press, 2006-09-10)
We investigate the relationship between soft X-ray luminosity and mass for low-redshift clusters of galaxies by comparing observed number counts and scaling laws to halo-based expectations of Lambda CDM cosmologies. We ...
Future evolution of cosmic structure in an accelerating universe
(Univ Chicago Press, 2003-10-20)
Current cosmological data indicate that our universe contains a substantial component of dark vacuum energy that is driving the cosmos to accelerate. We examine the immediate and longer term consequences of this dark energy ...