Now showing items 21-30 of 39
Effects of selection and covariance on X-ray scaling relations of galaxy clusters
(Blackwell Publishing, 2008-01-01)
We explore how the behaviour of galaxy cluster scaling relations are affected by flux-limited selection biases and intrinsic covariance among observable properties. Our models presume log-normal covariance between luminosity ...
Deprojection of galaxy cluster X-ray, Sunyaev-Zeldovich temperature decrement, and weak-lensing mass maps
(Univ Chicago Press, 2001-11-10)
A general method of deprojecting two-dimensional images to reconstruct the three-dimensional structure of the projected object (specifically, X-ray, Sunyaev-Zeldovich [SZ], and gravitational lensing maps of rich clusters ...
Virial scaling of massive dark matter halos: Why clusters prefer a high normalization cosmology
(Univ Chicago Press, 2008-01-01)
We present a precise estimate of the bulk virial scaling relation of halos formed via hierarchical clustering in an ensemble of simulated cold dark matter cosmologies. The result is insensitive to cosmological parameters; ...
Clustering of galaxy clusters in cold dark matter universes
(Blackwell Science Ltd, 2000-11-21)
We use very large cosmological N-body simulations to obtain accurate predictions for the two-point correlations and power spectra of mass-limited samples of galaxy clusters. We consider two currently popular cold dark ...
The Mean and Scatter of the Velocity Dispersion-Optical Richness Relation for maxBCG Galaxy Clusters
(Univ Chicago Press, 2007-11-01)
The distribution of galaxies in position and velocity around the centers of galaxy clusters encodes important information about cluster mass and structure. Using the maxBCG galaxy cluster catalog identified from imaging ...
Galaxy clusters in Hubble volume simulations: Cosmological constraints from sky survey populations
(Univ Chicago Press, 2002-07-01)
We use gigaparticle N-body simulations to study galaxy cluster populations in Hubble volumes of LambdaCDM (Omega(m) = 0.3, Omega(Lambda) = 0.7) and tauCDM (Omega(m) = 1) world models. Mapping past light cones of locations ...
MaxBCG: A red-sequence galaxy cluster finder
(Univ Chicago Press, 2007-05-01)
Measurements of galaxy cluster abundances, clustering properties, and mass-to-light ratios in current and future surveys can provide important cosmological constraints. Digital wide-field imaging surveys, the recently ...
Shapes and alignments of galaxy cluster halos
(Univ Chicago Press, 2005-08-20)
We present distribution functions and mark correlations of the shapes of massive dark matter halos derived from Hubble volume simulations of a Lambda CDM universe. We measure both position and velocity shapes within spheres ...
Effects of preheating on X-ray scaling relations in galaxy clusters
(Univ Chicago Press, 2001-07-10)
The failure of purely gravitational and gasdynamical models of X-ray cluster formation to reproduce basic observed properties of the local cluster population suggests the need for one or more additional physical processes ...