Aims. We aim at constraining the assembly history of clusters by studying the intra cluster light (ICL) properties, estimating its contribution to the fraction of baryons in stars, f∗, and understanding possible systematics/bias using different ICL detection techniques. Methods. We developed an automated method, GALtoICL, based on the software GALAPAGOS to obtain a refined version of typical BC...

We examine metal and entropy content in galaxy groups having TX ≈ 0.5− 2 keV in cosmological hydrodynamic simulations. Our simulations include a well-constrained prescription for galactic outflows following momentum-driven wind scalings, and a sophisticated chemical evolution model. Our simulation with no outflows reproduces observed iron abundances in X-ray emitting gas, but the oxygen abundan...

We use the RASS-SDSS galaxy cluster sample to compare the quality of optical and X-ray luminosities as predictors of other cluster properties such as their masses, temperatures, and velocity dispersions. We use the SDSS spectroscopic data to estimate the velocity dispersions and the virial masses of a subsample of 69 clusters within r500 and r200. The ASCA temperature of the intracluster medium...

We report the discovery of JKCS041, a massive near-infrared selected cluster of galaxies z = 1.9. The cluster was originally discovered using a modified red-sequence method and was also detected in follow-up Chandra data as extended X-ray source. Optical and near-infrared imaging data alone allow us to show that the detection of JKCS041 is as secure as the detections of clusters in the REFLEX s...

This is the second in a series of papers in which we derive simultaneous constraints on cosmology and X-ray scaling relations using observations of massive, X-ray fluxselected galaxy clusters. The data set consists of 238 clusters drawn from the ROSAT All-Sky Survey with 0.1–2.4 keV luminosities > 2.5×10h 70 erg s, and incorporates extensive follow-up observations using the Chandra X-ray Observ...

Cosmological simulations of galaxy clusters typically find that the weight of a cluster at a given radius is not balanced entirely by the thermal gas pressure of the hot ICM, with theoretical studies emphasizing the role of random turbulent motions to provide the necessary additional pressure support. Using a set of highresolution, hydrodynamical simulations of galaxy clusters that include radi...

We present here a study based on Xmm–newton data of RX J0256.5+0006, a medium distant (z=0.36) cluster of galaxies found in the Bright SHARC catalog. The X-ray emitting intracluster medium shows a bimodal structure: one main cluster component and a substructure in the west, which very likely falls onto the main cluster centre. The subcluster shows after subtraction of the main cluster component...

We examine the X-ray luminosity scaling relations of 31 nearby galaxy clusters from the Representative XMM-Newton Cluster Structure Survey (REXCESS). The objects are selected only in X-ray luminosity, optimally sampling the cluster luminosity function. Temperatures range from 2 to 9 keV, and there is no bias toward any particular morphological type. To reduce measurement scatter we extract pert...

The longstanding bureaucratic logjam preventing much needed foreign qualified doctors from supplementing local skills shortfalls has been shaken loose while much improved rural and 'scarce skills' allowances are set to flow from July this year. Lobbying of the National Department of Health (DOH) by the Rural Doctors Association of South Africa (RUDASA), plus a court action in May 2001 by the Fo...

BACKGROUND The purpose of this study was to determine, among the Indian community of Chatsworth, South Africa, the prevalence and utilisation patterns of complementary and alternative medicine (CAM), attitudes associated with CAM use and communication patterns of CAM users with their primary care doctors. METHODS Face-to-face structured interviews were conducted in Chatsworth, a suburb of Dur...