Search Publications
Merger shocks in Abell 3667 and the Cygnus A cluster
Finoguenov, A.; Wik, D. R.; Sarazin, C. L.
We present new XMM-Newton observations of the northwest (NW) radio relic region in the cluster Abell 3667. We detect a jump in the X-ray surface brightness and X-ray temperature at the sharp outer edge of the radio relic which indicate that this is the location of a merger shock with a Mach number of about 2. Comparing the radio emission to the sh…
The origin of the chemical elements in cluster cores
de Plaa, J.
Metals play a fundamental role in ICM cooling processes in cluster cores through the emission of spectral lines. But when and how were these metals formed and distributed through the ICM? The X-ray band has the unique property of containing emission lines from all elements from carbon to zinc within the 0.1-10 keV band. Using XMM-Newton, the abund…
Metal jumps across sloshing cold fronts: The case of A 496
Molendi, S.; De Grandi, S.; Ghizzardi, S.
Cold-fronts in cool-core clusters are thought to be induced by minor mergers and to develop through a sloshing mechanism. While temperature and surface-brightness jumps have been detected and measured in many systems, a detailed characterization of the metal abundance across the discontinuity is only available for a handful of objects. Within the …
X-ray observations of the merging cluster CIZA J2242.8+5301
Simionescu, A.; Croston, J. H.; van Weeren, R. J. +4 more
Multiwavelength studies of radio relics at merger shocks set powerful constraints on the relics origin and formation mechanism. However, for X-ray observations, a main difficulty is represented by the low X-ray surface brightness far out in the cluster outskirts, where relics are typically found. Here, we present XMM-Newton results from a 130-ks o…
X-ray emission from RX J1720.1+2638 and Abell 267: A comparison between a fossil and a non-fossil system
Jiménez-Bailón, E.; Aguerri, J. A. L.; Lozada-Muñoz, M.
We present the XMM-Newton X-ray analysis of RX J1720.1+2638 and Abell 267, a non-fossil and a fossil system, respectively. The whole spectrum of both objects can be explained by thermal emission. The luminosities found for RX J1720.1+2638 and Abell 267 in the 2-10 keV band are 6.20+0.04-0.02{×}1044 and 3.90+0.…
Search for galaxy-ICM interaction in rich clusters of galaxies
Shimasaku, K.; Gandhi, P.; Xu, Haiguang +7 more
Based on optical and X-ray data for a sample of 34 relaxed rich clusters with redshift of 0.1-0.9, we studied the relative spatial distribution of the two major baryon contents, the cluster galaxies and the hot plasmas. Using photometric data taken with the UH88 telescope, we determined the integrated radial light profiles of member galaxies in ea…
Scaling relations with a complete sample of galaxy groups
Lovisari, L.; Reiprich, T. H.
Galaxy clusters are an attractive tool to constrain cosmological parameters and well-determined scaling relations between X-ray observables and cluster mass give us a precious diagnostic to study the thermodynamical history of the intra-cluster medium (ICM). We are in the process of improving the accuracy of scaling relations using a complete samp…
The ``Sausage'' and ``Toothbrush'' clusters of galaxies and the prospects of LOFAR observations of clusters of galaxies
Brunetti, G.; Tasse, C.; Cassano, R. +27 more
LOFAR, the Low Frequency Radio Array, is a new pan-European radio telescope that is almost fully operational. One of its main drivers is to make deep images of the low frequency radio sky. To be able to do this a number of challenges need to be addressed. These include the high data rates, removal of radio frequency interference, calibration of th…
Radio observations of Planck clusters
Kale, R.
Recently, a number of new galaxy clusters have been detected by the ESA-Planck satellite, the South Pole Telescope, and the Atacama Cosmology Telescope using the Sunyaev-Zel'dovich effect. Several of the newly detected clusters are massive, merging systems with disturbed morphology in the X-ray surface brightness. Diffuse radio sources in clusters…
Distant clusters of galaxies in a deep XMM-Newton observation
Böhringer, H.; Rosati, P.; Schwope, A. +10 more
The XMM-Newton Distant Cluster Project (XDCP) aims at the identification of a well defined sample of X-ray selected clusters of galaxies at redshifts z ≥ 0.8. As part of this project, we analyse the deep archival XMM-Newton exposure of LBQS 2212-1759 to quantify the cluster content. We validate the optical follow-up strategy as well as the X-ray s…