Search Publications
Exploring the structure of galaxy clusters: XMM-Newton observations of the REFLEX-DXL clusters at z ∼ 0.3
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +5 more
The precise determination of global properties of galaxy clusters, and their scaling relations, is a task of prime importance for the use of clusters as cosmological probes. We performed a detailed XMM-Newton study of 14 X-ray luminous REFLEX Survey clusters at z ∼ 0.3. We found that the properties of the galaxy clusters show a self-similar behavi…
Merging clusters of galaxies observed with XMM-Newton
Pratt, G. W.; Bourdin, H.; Sauvageot, J. -L. +1 more
We present results from the XMM-Newton observations of our ongoing program on merging clusters. To date three clusters have been observed, covering the temporal sequence from early to late stage mergers: A1750, A2065 and A3921. Using spatially-resolved spectroscopy of discrete regions, hardness ratio and temperature maps, we show that all three cl…
Measured cosmological mass density in the WHIM: The solution to the ‘Missing Baryons’ problem
Elvis, Martin; Nicastro, Fabrizio; Fiore, Fabrizio +1 more
We review the current high-significance X-ray detections of Warm-Hot Intergalactic Medium (WHIM) filaments at z > 0 along the lines of sight to the two blazars Mrk 421 ( z = 0.03) and 1ES 1028 + 511 ( z = 0.361). For these WHIM filaments, we derive ionization corrections and, when possible, metallicity estimates. This allows us to obtain refine…
XMM-Newton observations of the Mouse, SLX 1744 299 and SLX 1744 300
Maeda, Yoshitomo; Pavlov, George G.; Mori, Hideyuki +2 more
We observed the radio and X-ray source G359.23-0.82, also known as "the Mouse", with XMM-Newton. The X-ray image of this object shows a point-like source at the Mouse's "head", accompanied by a "tail" that extends for about 40″ westward. The morphology is consistent with that observed recently with Chandra [Gaensler, B.M., van der Swaluw, E., Cami…
Probing the dark matter profile of hot clusters and the M- T relation with XMM- Newton
Arnaud, M.; Pointecouteau, E.; Pratt, G. W.
We present results based on XMM- Newton observations of a small sample of hot galaxy clusters. Making a full use of XMM- Newton's spectro-imaging capabilities, we have extracted the radial temperature profile and gas density profile, and with this information, calculated the total mass profile of each cluster (under the assumption of hydrostatic e…
One-up on L1: Can X-rays provide longer advanced warning of solar wind flux enhancements than upstream monitors?
Kuntz, K. D.; Snowden, S. L.; Collier, M. R. +1 more
Observations of strong solar wind proton flux correlations with ROSAT X-ray rates along with high spectral resolution Chandra observations of X-rays from the dark Moon show that soft X-ray emission mirrors the behavior of the solar wind. In this paper, based on an analysis of an X-ray event observed by XMM-Newton resulting from charge exchange of …
Cluster scaling and its redshift evolution from XMM-Newton
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +4 more
We put together the results of XMM-Newton observations of a number of representative group and cluster samples at low and high redshifts. These results confirm the entropy ramp as an explanation of the observed scaling relations. We observe a mild evolution in the entropy of clusters. The observed degree of evolution is consistent with expectation…
A model grid for the spectral analysis of X-ray emission in young Type Ia supernova remnants
Badenes, Carles; Borkowski, Kazimierz J.; Bravo, Eduardo
We address a new set of models for the spectral analysis of the X-ray emission from young, ejecta-dominated Type Ia supernova remnants. These models are based on hydrodynamic simulations of the interaction between Type Ia supernova explosion models and the surrounding ambient medium, coupled to self-consistent ionization and electron heating calcu…
The temperature structure in the core of Sérsic 159-03
Kaastra, J. S.; de Plaa, J.; Tamura, T. +6 more
We present results from a new 120 ks XMM-Newton observation of the cluster of galaxies Sérsic 159-03. In this paper, we focus on the high-resolution X-ray spectra obtained with the Reflection Grating Spectrometer (RGS). The spectra allow us to constrain the temperature structure in the core of the cluster and determine the emission measure distrib…
The merging cluster Abell 85 caught between meals by XMM-Newton
Durret, Florence; Lima Neto, Gastão B.; Forman, William
Our XMM-Newton observations of Abell 85 confirm the extended 4 Mpc filament first detected with ROSAT, which has an X-ray temperature of about ∼2 keV and is probably made of groups falling on to the cluster. A comparison of the temperature map with numerical simulations show that Abell 85 had intense merging activity in the past and is not fully r…