Now showing items 21-30 of 48
A Simulation of the Intracluster Medium With Feedback from Cluster Galaxies
(Univ Chicago Press, 1994-12-20)
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 history of the ...
The Cosmological Dependence of Cluster Density Profiles
(Univ Chicago Press, 1994-10-20)
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 cosmology and initial ...
Mass estimates of X-ray clusters
(Univ Chicago Press, 1996-10-01)
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 cosmological models and ...
A large air shower array to search for astrophysical sources emitting [gamma]-rays with energies >=1014 eV
(Elsevier, 1994-07-15)
We describe the technical details and the performance of a large array which detects both the electron and muon components in extensive air showers with energies >= 1014 eV. The array was designed to search for [gamma]-rays ...
HST colour–magnitude diagrams of six old globular clusters in the LMC
(Blackwell Science Ltd, 1998-11-01)
Substructure in clusters as a cosmological test
(Univ Chicago Press, 1996-08-20)
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 understand these results ...
Rosat Observations of Compact-Groups of Galaxies
(Univ Chicago Press, 1995-04-20)
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 group. We find that ...
Radial temperature profiles of X-ray-emitting gas within clusters of galaxies
(Univ Chicago Press, 1999-07-10)
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, energy-dependent ...
Properties of simulated compact groups of galaxies
(Amer Inst Physics, 1996-08)
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 behavior of the non-baryonic ...