X-ray spectroscopy of cooling clusters
نویسندگان
چکیده
منابع مشابه
X-ray Spectroscopy of Cooling Clusters
We review the X-ray spectra of the cores of clusters of galaxies. Recent high resolution X-ray spectroscopic observations have demonstrated a severe deficit of emission at the lowest X-ray temperatures as compared to that expected from simple radiative cooling models. The same observations have provided compelling evidence that the gas in the cores is cooling below half the maximum temperature....
متن کاملCooling of X-Ray Emitting Gas by Heat Conduction in the Center of Cooling Flow Clusters
We study the possibility that a large fraction of the gas at temperatures of ∼ 10 K in cooling flow clusters cools by heat conduction to lower temperatures, rather than by radiative cooling. We argue that this process, when incorporated into the so-called “moderate cooling flow model,” where the effective age of the intracluster medium is much lower than the age of the cluster, reduces substant...
متن کاملStatistics of X-ray observables for the cooling-core and non-cooling core galaxy clusters
We present a statistical study of the occurrence and effects of the cooling cores in the clusters of galaxies in a flux-limited sample, HIFLUGCS, based on ROSAT and ASCA observations. About 49% of the clusters in this sample have a significant, classically-calculated cooling-flow, mass-deposition rate. The upper envelope of the derived mass-deposition rate is roughly proportional to the cluster...
متن کاملHigh Resolution X-ray Spectroscopy of 14 Cooling-flow Clusters of Galaxies Using the Reflection Grating Spectrometers on Xmm-newton
We present high resolution X-ray spectra of 14 coolingflow X-ray clusters and groups obtained with the Reflection Grating Spectrometers (RGS) on XMM-Newton. The spectra exhibit line emission from a number of Fe L charge states as well as O VIII, Mg XII, Ne X, Si XIV & XIII, N VII, and C VI. All spectra show a deficit of soft X-ray lines predicted from the isobaric multi-phase spectral model as ...
متن کاملSimulations of X-ray Clusters
We present simulations of the formation and evolution of galaxy clusters in the Cold Dark Matter cosmogony. Clusters with a wide range of mass were selected from previous N-body models, and were resimulated at higher resolution using a combined N-body/Smooth Particle Hydrodynamics code. The eeects of radiative cooling on the gas are neglected. While many present-day clusters are predicted to be...
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ژورنال
عنوان ژورنال: Physics Reports
سال: 2006
ISSN: 0370-1573
DOI: 10.1016/j.physrep.2005.12.007