نتایج جستجو برای: infrec r500
تعداد نتایج: 94 فیلتر نتایج به سال:
Izindaba As long as political parties decide who represents us, corruption-breeding patronage will persist – as is best illustrated by the Eastern Cape's virtually collapsed healthcare delivery system. For provinces which mainly incorporated rural apartheid 'homelands' into their administrations, another albatross around their necks is the historical lack of restitution via pure per capita-base...
We examine the systematics affecting the X-ray mass estimators applied to a set of five galaxy clusters resolved at high resolution in hydrodynamic simulations, including cooling, star formation and feedback processes. These simulated objects are processed through the X-ray Map Simulator, X-MAS , to provide Chandra -like long exposures that are analyzed to reconstruct the gas temperature, densi...
We study the effects of radiative cooling and galaxy formation on the baryon fractions in clusters using high-resolution cosmological simulations that resolve formation of cluster galaxies. The simulations of nine individual clusters spanning a decade in mass are performed with the shock-capturing eulerian adaptive mesh refinement N -body+gasdynamics ART code. For each cluster the simulations w...
We study the mid-infrared properties of galaxies in 30 massive galaxy clusters at 0.02≤z≤0.40, using panoramic Spitzer/MIPS 24μm and near-infrared data, including 27 new observations from the LoCuSS and ACCESS surveys. This is the largest sample of clusters to date with such high-quality and uniform mid-infrared data covering not only the cluster cores, but extending into the infall regions. We...
We present a study of the integrated physical properties of a sample of 28 X-ray galaxy clusters observed with Chandra at a redshift between 0.4 and 1.3. In particular, we have twelve objects in the redshift range 0.4–0.6, five between 0.6 and 0.8, seven between 0.8 and 1 and four at z >1.0, compounding the largest sample available for such a study. We focus particularly on the properties and e...
We present a study of the integrated physical properties of a sample of 28 X-ray galaxy clusters observed with Chandra at redshift between 0.4 and 1.3. In particular, we have twelve objects in the redshift range 0.4–0.6, five between 0.6 and 0.8, seven between 0.8 and 1 and four at z >1.0, compounding the largest sample available for such a study. We focus particularly on the properties and evo...
IZINDABA 218 Dispensing doctors breathed a sigh of relief on 11 March when the government's dogged legal insistence that they not dispense medicine within 5 km of any pharmacy was overruled on appeal to the Constitutional Court. The victory is all the more significant in that doctors setting up practices in future will also not be affected by the provision which the court declared null and void...
We have performed a statistical analysis of a sample of 28 nearby galaxy groups derived primarily from the Two-Dimensional XMM-Newton Group Survey (2dXGS), in order to ascertain what factors drive the observed differences in group properties. We specifically focus on entropy and the role of feedback, and divide the sample into cool core (CC) and non cool core (NCC) systems. This is the first ti...
We present the results of an X-ray analysis of 80 galaxy clusters selected in the 2500 deg South Pole Telescope survey and observed with the Chandra X-ray Observatory. We divide the full sample into subsamples of ∼20 clusters based on redshift and central density, performing a joint X-ray spectral fit to all clusters in a subsample simultaneously, assuming self-similarity of the temperature pro...
The hot, diffuse gas that fills the largest overdense structures in the Universe — clusters of galaxies and a web of giant filaments connecting them — provides us with tools to address a wide array of fundamental astrophysical and cosmological questions via observations in the X-ray band. Clusters are sensitive cosmological probes. To utilize their full potential for precision cosmology in the ...
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