The LX-M relation of clusters of galaxies (2008)
Rykoff, ES, Evrard, AE, McKay, TA, Becker, MR, Johnston, DE, Koester, BP, ...
We present a new measurement of the scaling relation between X-ray luminosity and total mass for 17000 galaxy clusters in the maxBCG cluster sample. Stacking subsamples within fixed ranges of optical...
Evrard, AE, Bialek, J, Busha, M, White, M, Habib, S, Heitmann, K, ...
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...
Effects of selection and covariance on X-ray scaling relations of galaxy clusters (2008)
Nord, B, Stanek, R, Rasia, E, Evrard, AE
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...
Red-sequence cluster finding in the millennium simulation (2007)
Cohn, JD, Evrard, AE, White, M, Croton, D, Ellingson, E
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...
Becker, MR, McKay, TA, Koester, B, Wechsler, RH, Rozo, E, Evrard, AE, ...
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...
The merger in abell 576: A line-of-sight bullet cluster? (2007)
Dupke, RA, Mirabal, N, Bregman, JN, Evrard, AE
Using a combination of Chandra and XMM-Newton observations, we confirmed the presence of a significant velocity gradient along the northeast-southwest direction in the intracluster gas of the cluster...
The asymptotic form of cosmic structure: Small-scale power and accretion history (2007)
Busha, MT, Evrard, AE, Adams, FC
We explore the effects of small-scale structure on the formation and equilibrium of dark matter halos in a universe dominated by vacuum energy. We present the results of a suite of four N-body...
MaxBCG: A red-sequence galaxy cluster finder (2007)
Koester, BP, Mckay, TA, Annis, J, Wechsler, RH, Evrard, AE, Rozo, E, ...
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...
A MaxBCG Catalog of 13,823 Galaxy Clusters from the Sloan Digital Sky Survey (2007)
Koester, BP, McKay, TA, Annis, J, Wechsler, RH, Evrard, AE, Bleem, L, ...
We present a catalog of galaxy clusters selected using the maxBCG red-sequence method from Sloan Digital Sky Survey photometric data. This catalog includes 13,823 clusters with velocity dispersions...
Cluster-supercluster alignments (2007)
We study correlations in spatial orientation between galaxy clusters and their host superclusters using a Hubble volume N-body realization of a concordance cosmology and an analytic model for tidally...
Rykoff, ES, McKay,TA, Becker, MR, Evrard, AE, Johnston, DE, Koester, BP, ...
Determining the scaling relations between galaxy cluster observables requires large samples of uniformly observed clusters. We measure the mean X-ray luminosity-optical richness (L¯X-N¯200)...
The X-ray luminosity-mass relation for local clusters of galaxies (2006)
Stanek, R, Evrard, AE, Bohringer, H, Schuecker, P, Nord, B
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...
Effects of mergers and core structure on the bulk properties of nearby galaxy clusters (2006)
O'Hara, TB, Mohr, JJ, Bialek, JJ, Evrard, AE
We use X-ray morphological measurements and the scatter of clusters about observed and simulated scaling relations to examine the impact of merging and core-related phenomena on the structure of...
Detecting intracluster gas motion in galaxy clusters: Mock Astro-E2 observations (2005)
Pawl, A, Evrard, AE, Dupke, RA
We explore the detectability of bulk motions in the X-ray-emitting intracluster medium using a catalog of 1836 mock Astro-E2 observations of simulated clusters of galaxies. We generate...
The C4 clustering algorithm: clusters of galaxies in the Sloan Digital Sky Survey (2005)
Miller, CJ, Nichol, RC, Reichart, D, Wechsler, RH, Evrard, AE, Annis, J, ...
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...
Shapes and alignments of galaxy cluster halos (2005)
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...
Simulations of the formation, evolution and clustering of galaxies and quasars (2005)
Springel, V, White, SDM, Jenkins, A, Frenk, CS, Yoshida, N, Gao, L, ...
The cold dark matter model has become the leading theoretical picture for the formation of structure in the Universe. This model, together with the theory of cosmic inflation, makes a clear...
The ultimate halo mass in a ?CDM universe (2004)
Busha, MT, Evrard, AE, Adams, FC, Wechsler, RH
In the far future of an accelerating ?CDM cosmology, the cosmic web of large-scale structure consists of a set of increasingly isolated haloes in dynamical equilibrium. We examine the approach of...
Future evolution of cosmic structure in an accelerating universe (2003)
Busha, MT, Adams, FC, Wechsler, RH, Evrard, AE
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...
The asymptotic structure of space-time (2003)
Adams, FC, Busha, MT, Evrard, AE, Wechsler, RH
Astronomical observations strongly suggest that our universe is now accelerating and contains a substantial admixture of dark vacuum energy. Using numerical simulations to study this newly...
Studying dark energy with galaxy cluster surveys (2003)
Mohr, JJ, O'Shea, B, Evrard, AE, Bialek, J, Haiman, Z
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...
A cold front in a preheated galaxy cluster (2002)
Bialek, JJ, Evrard, AE, Mohr, JJ
We present a simulated cluster of galaxies, modeled with a preheated intracluster medium, that exhibits X-ray features similar to the cold fronts seen in Chandra observations. Mock observations at a...
Evrard, AE, MacFarland, TJ, Couchman, HMP, Colberg, JM, Yoshida, N, White, SDM, ...
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...
Hamana, T, Yoshida, N, Suto, Y, Evrard, AE
We develop a phenomenological model to predict the clustering of dark matter halos on the light cone by combining several existing theoretical models. Assuming that the velocity field of halos on...
Zaroubi, S, Squires, G, De Gasperis, G, Evrard, AE, Hoffman, Y, Silk, J
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...
Simulations of deep pencil-beam redshift surveys (2001)
Yoshida, N, Colberg, J, White, SDM, Evrard, AE, MacFarland, TJ, Couchman, HMP, ...
We create mock pencil-beam redshift surveys from very large cosmological N-body simulations of two cold dark matter (CDM) cosmogonies, an Einstein-de Sitter model (tau CDM) and a flat model with Ohm...
Effects of preheating on X-ray scaling relations in galaxy clusters (2001)
Bialek, JJ, Evrard, AE, Mohr, JJ
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...
The temperature-mass relation in magnetized galaxy clusters (2001)
Dolag, K, Evrard, AE, Bartelmann, M
We use cosmological, magneto-hydrodynamic simulations of galaxy clusters to quantify the dynamical importance of magnetic fields in these clusters. The set-up of initial magnetic field strengths at...
The mass function of dark matter haloes (2001)
Jenkins, A, Frenk, CS, White, SDM, Colberg, JM, Cole, S, Evrard, AE, ...
We combine data from a number of N-body simulations to predict the abundance of dark haloes in cold dark matter (CDM) universes over more than four orders of magnitude in mass. A comparison of...
Confusion of diffuse objects in the X-ray sky (2001)
Voit, GM, Evrard, AE, Bryan, GL
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%)...
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...
Expectations for an interferometric Sunyaev-Zeldovich effect survey for galaxy clusters (2000)
Holder, GP, Mohr, JJ, Carlstrom, JE, Evrard, AE, Leitch, EM
We estimate the expected yield of a nontargeted survey for galaxy clusters using the Sunyaev-Zeldovich effect (SZE). Estimating survey yields requires a detailed model for both cluster properties and...
Clustering of galaxy clusters in cold dark matter universes (2000)
Colberg, JM, White, SDM, Yoshida, N, MacFarland, TJ, Jenkins, A, Frenk, CS, ...
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...
The X-ray size-temperature relation for intermediate-redshift galaxy clusters (2000)
Mohr, JJ, Reese, ED, Ellingson, E, Lewis, AD, Evrard, AE
We present the first measurements of the X-ray size-temperature (ST) relation in intermediate-redshift (z similar to 0.30) galaxy clusters. We interpret the local ST relation (z similar to 0.06) in...
A multiphase model for the intracluster medium (2000)
Nagai, D, Sulkanen, ME, Evrard, AE
Constraints on the clustered mass density Omega(m) of the Universe derived from the observed population mean intracluster gas fraction [f(ICM)] of X-ray clusters may be biased by reliance on a...
Frenk, CS, White, SDM, Bode, P, Bond, JR, Bryan, GL, Cen, R, ...
We have simulated the formation of an X-ray cluster in a cold dark matter universe using 12 different codes. The codes span the range of numerical techniques and implementations currently in use,...
The effects of clumping and substructure on intracluster medium mass measurements (1999)
Mathiesen, B, Evrard, AE, Mohr, JJ
We examine an ensemble of 48 simulated clusters to determine the effects of small-scale density fluctuations and large-scale substructure on X-ray measurements of the intracluster medium (ICM) mass....
Radial temperature profiles of X-ray-emitting gas within clusters of galaxies (1999)
Irwin, JA, Bregman, JN, Evrard, AE
Previous analyses of ASCA data of clusters of galaxies have found conflicting results regarding the slope of the temperature profile of the hot X-ray gas within clusters, mainly because of the large,...
Properties of the intracluster medium in an ensemble of nearby galaxy clusters (1999)
Mohr, JJ, Mathiesen, B, Evrard, AE
We present a systematic analysis of the intracluster medium (ICM) in an X-ray flux limited sample of 45 galaxy clusters. Using archival ROSAT Position-Sensitive Proportional Counter (PSPC) data and...
The L-X-T relation and intracluster gas fractions of X-ray clusters (1999)
We re-examine the X-ray luminosity-temperature relation using a nearly homogeneous data set of 24 clusters selected for statistically accurate temperature measurements and absence of strong cooling...
Cosmological simulations with scale-free initial conditions. I. Adiabatic hydrodynamics (1998)
Owen, JM, Weinberg, DH, Evrard, AE, Hernquist, L, Katz, N
We analyze hierarchical structure formation based on scale-free initial conditions in an Einstein-de Sitter universe, including a baryonic component with Omega(bary) = 0.05. We present three...
Constraints on Omega(0) and cluster evolution using the ROSAT logN-logS relation (1998)
We examine the Likelihoods of different cosmological models and cluster evolutionary histories by comparing semi-analytical predictions of X-ray cluster number counts with observational data from the...
An X-ray size-temperature relation for galaxy clusters: Observation and simulation (1997)
We show that galaxy clusters conform to a tight relation between X-ray isophotal size R-I and emission-weighted intracluster medium (ICM) temperature [T-X]. The best-fit relation for 41 members of an...
The intracluster gas fraction in X-ray clusters: constraints on the clustered mass density (1997)
The mean intracluster gas fraction of X-ray clusters within their hydrostatic regions is derived from recent observational compilations of David, Jones & Forman and White & Fabian. At radii...
Galaxy dynamics in clusters (1996)
Frenk, CS, Evrard, AE, White, SDM, Summers, FJ
We use high-resolution simulations to study the formation and distribution of galaxies within a cluster that forms hierarchically. We follow both dark matter and a gas component that is subject to...
Mass estimates of X-ray clusters (1996)
Evrard, AE, Metzler, CA, Navarro, JF
We use cosmological gasdynamic simulations to investigate the accuracy of galaxy cluster mass estimates based on X-ray observations. The experiments follow the formation of clusters in different...
Substructure in clusters as a cosmological test (1996)
Crone, MM, Evrard, AE, Richstone, DO
We use N-body simulations to test the dependence of cluster substructure on four cosmologies and three initial power spectra. Our purpose is to quantify the amount of substructure in each model and...
Properties of simulated compact groups of galaxies (1996)
Pildis, RA, Evrard, AE, Bregman, JN
We analyze compact groups of galaxies appearing in a galaxy formation simulation dominated by cold dark matter (Omega(0)=1, Omega(baryon)=0.1). The simulation uses an N-body code to model the...
Cosmological Constraints from Observed Cluster X-Ray Morphologies (1995)
Mohr, JJ, Evrard, AE, Fabricant, DG, Geller, MJ
We use a representative sample of 65 galaxy dusters observed with the Einstein IPC to constrain the range of cluster X-ray morphologies. We develop and apply quantitative and reproducible measures of...
Rosat Observations of Compact-Groups of Galaxies (1995)
Pildis, RA, Bregman, JN, Evrard, AE
We have systematically analyzed a sample of 13 new and archival ROSAT Position Sensitive Proportional Counter observations of compact groups of galaxies: 12 Hickson compact groups plus the NCG 2300...
A Simulation of the Intracluster Medium With Feedback from Cluster Galaxies (1994)
We detail method and report first results from a three-dimensional hydrodynamical and N-body simulation of the formation and evolution of a Coma-sized cluster of galaxies, with the intent of studying...
The Cosmological Dependence of Cluster Density Profiles (1994)
Crone, MM, Evrard, AE, Richstone, DO
We use N-body simulations to study the shape of mean cluster density and velocity profiles in the nonlinear regime formed via gravitational instability. The dependence of the final structure on both...
A Comparison of Cosmological Hydrodynamic Codes (1994)
Kang, H, Ostriker, JP, Cen, R, Ryu, DS, Hernquist, L, Evrard, AE, ...
We present a detailed comparison of the simulation results of various cosmological hydrodynamic codes. Starting with identical initial conditions based on the cold dark matter scenario for the growth...
Optical Signatures of High-Redshift Galaxy Clusters (1994)
We combine an N-body and gasdynamic simulation of structure formation with an updated population synthesis code to explore the expected optical characteristics of a high-redshift cluster of galaxies....
2-Fluid Simulations of Galaxy Formation (1994)
Evrard, AE, Summers, FJ, Davis, M
We investigate the formation of galaxies and larger structure with a simulation modeling two gravitationally coupled fluids representing dark matter and baryons. The baryon gas dynamics are...
A Morphology-Cosmology Connection for X-Ray-Clusters (1993)
Evrard, AE, Mohr, JJ, Fabricant, DG, Geller, MJ
We employ N-body/three-dimensional gasdynamic simulations of the formation of galaxy clusters to determine whether cluster X-ray morpholgies can be used as cosmological constraints. Confirming the...
We report the results of N-body experiments employing Gaussian random initial conditions designed to address the effect of previrialization recently examined by Peebles. The central issue is whether...
The Contribution of Galaxy Clusters to the Soft-X-Ray Background (1992)
Blanchard, A, Wachter, K, Evrard, AE, Silk, J
We examine models for the expected contribution to the X-ray background (XRB) from clusters of galaxies in a flat universe with a spectrum of fluctuations corresponding to the standard cold dark...
Structure in a loitering universe. (1992)
The authors study the formation of structure for a universe that undergoes a recent loitering phase. They compare the nonlinear mass distribution to that in a standard, matter dominated cosmology....
Expectations for X-Ray-Cluster Observations by the Rosat Satellite (1991)
We present predictions for characteristics of the X-ray cluster population expected to be observed by the ROSAT satellite. The theoretical modeling requires an assumed fluctuation spectrum and...
The Morphology-Density Relation for Galaxies in A Cold Dark Matter-Dominated Universe (1990)
Evrard, AE, Silk, J, Szalay, AS
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