▪ Abstract ROSAT observations indicate that approximately half of all nearby groups of
galaxies contain spatially extended X-ray emission. The radial extent of the X-ray emission …

The halo occupation distribution (HOD) describes the relation between galaxies and dark
matter at the level of individual dark matter halos. The properties of galaxies residing at the …

Numerous methods for finding clusters at moderate to high redshifts have been proposed in
recent years, at wavelengths ranging from radio to X-rays. In this paper we describe a new …

We present a systematic analysis of 43 nearby galaxy groups (kT 500= 0.7–2.7 keV or M
500= 10 13–10 14 h− 1 M☉, 0.012< z< 0.12), based on Chandra archival data. With robust …

We present Chandra gas temperature profiles at large radii for a sample of 13 nearby,
relaxed galaxy clusters and groups, which includes A133, A262, A383, A478, A907, A1413 …

We investigate various galaxy occupation statistics of dark matter halos using a large galaxy
group catalog constructed from the Sloan Digital Sky Survey Data Release 4 (SDSS DR4) …

We present a semianalytic model for cold dark matter halo substructure that can be used as
a framework for studying the physics of galaxy formation and as an ingredient in halo …

We describe the properties of a sample of galaxy groups with very unusual distributions of
galaxy luminosities. The most extreme example has an X-ray luminosity similar to that of the …

We use the conditional luminosity function (CLF) and data from the 2-degree Field Galaxy
Redshift Survey (2dFGRS) to constrain the average relation between light and mass in a …

We present results of a measurement of the shape of the density profile of galaxy groups
and clusters traced by 43 335 Luminous Red Galaxies (LRGs) with spectroscopic redshifts …