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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Structure and substructure analysis of DAFT/FADA galaxy clusters in the [0.4-0.9] redshift range
Astronomy and Astrophysics, Volume 561, Article A112, Year 2014
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Description
Context. The DAFT/FADA survey is based on the study of ~90 rich (masses found in the literature >2 × 1014 M ⊙) and moderately distant clusters (redshifts 0.4 < z < 0.9), all with HST imaging data available. This survey has two main objectives: to constrain dark energy (DE) using weak lensing tomography on galaxy clusters and to build a database (deep multi-band imaging allowing photometric redshift estimates, spectroscopic data, X-ray data) of rich distant clusters to study their properties. Aims. We analyse the structures of all the clusters in the DAFT/FADA survey for which XMM-Newton and/or a sufficient number of galaxy redshifts in the cluster range are available, with the aim of detecting substructures and evidence for merging events. These properties are discussed in the framework of standard cold dark matter (ΛCDM) cosmology. Methods. In X-rays, we analysed the XMM-Newton data available, fit a β-model, and subtracted it to identify residuals. We used Chandra data, when available, to identify point sources. In the optical, we applied a Serna & Gerbal (SG) analysis to clusters with at least 15 spectroscopic galaxy redshifts available in the cluster range. We discuss the substructure detection efficiencies of both methods. Results. XMM-Newton data were available for 32 clusters, for which we derive the X-ray luminosity and a global X-ray temperature for 25 of them. For 23 clusters we were able to fit the X-ray emissivity with a β-model and subtract it to detect substructures in the X-ray gas. A dynamical analysis based on the SG method was applied to the clusters having at least 15 spectroscopic galaxy redshifts in the cluster range: 18 X-ray clusters and 11 clusters with no X-ray data. The choice of a minimum number of 15 redshifts implies that only major substructures will be detected. Ten substructures were detected both in X-rays and by the SG method. Most of the substructures detected both in X-rays and with the SG method are probably at their first cluster pericentre approach and are relatively recent infalls. We also find hints of a decreasing X-ray gas density profile core radius with redshift. Conclusions. The percentage of mass included in substructures was found to be roughly constant with redshift values of 5-15%, in agreement both with the general CDM framework and with the results of numerical simulations. Galaxies in substructures show the same general behaviour as regular cluster galaxies; however, in substructures, there is a deficiency of both late type and old stellar population galaxies. Late type galaxies with recent bursts of star formation seem to be missing in the substructures close to the bottom of the host cluster potential well. However, our sample would need to be increased to allow a more robust analysis. © 2014 ESO.
Authors & Co-Authors
Guennou, Loïc
France, Marseille
Laboratoire D'astrophysique de Marseille
South Africa, Durban
University of Kwazulu-natal
Adami, Christophe
France, Marseille
Laboratoire D'astrophysique de Marseille
Durret, Florence
France, Paris
Institut D’astrophysique de Paris
Lima Neto, G. B.
Brazil, Sao Paulo
Universidade de São Paulo
Ulmer, M. P.
United States, Evanston
Center for Interdisciplinary Exploration and Research in Astrophysics Ciera
Clowe, Douglas
United States, Athens
Ohio University
Lebrun, V.
France, Marseille
Laboratoire D'astrophysique de Marseille
Martinet, N.
France, Paris
Institut D’astrophysique de Paris
Allam, Sahar S.
United States, Batavia
Fermi National Accelerator Laboratory
United States, Baltimore
Space Telescope Science Institute
Annis, James T.
United States, Batavia
Fermi National Accelerator Laboratory
Basa, Stéphane
France, Marseille
Laboratoire D'astrophysique de Marseille
Benoist, Christophe O.
France, Nice
Observatoire de la Côte D'azur
Biviano, Andrea
France, Paris
Institut D’astrophysique de Paris
Italy, Trieste
Osservatorio Astronomico Di Trieste
Cappi, Alberto
France, Nice
Observatoire de la Côte D'azur
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Cypriano, Eduardo S.
Brazil, Sao Paulo
Universidade de São Paulo
Gavazzi, Raphaël
France, Paris
Institut D’astrophysique de Paris
Halliday, C.
Unknown Affiliation
Ilbert, Olivier
France, Marseille
Laboratoire D'astrophysique de Marseille
Jullo, Eric
France, Marseille
Laboratoire D'astrophysique de Marseille
Just, D.
United States, Tucson
The University of Arizona
Canada, Toronto
University of Toronto
Limousin, Marceau
France, Marseille
Laboratoire D'astrophysique de Marseille
Márquez, I.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Mazure, Alain
France, Marseille
Laboratoire D'astrophysique de Marseille
Murphy, K. J.
United States, Athens
Ohio University
Plana, H.
Brazil, Ilheus
Universidade Estadual de Santa Cruz
Rostagni, F.
France, Nice
Observatoire de la Côte D'azur
Russeil, Delphine
France, Marseille
Laboratoire D'astrophysique de Marseille
Schirmer, M.
Chile, La Serena
Gemini Observatorysouthern Operations Center
Germany, Bonn
Universität Bonn
Slezak, Éric
France, Nice
Observatoire de la Côte D'azur
Tucker, Douglas L.
United States, Batavia
Fermi National Accelerator Laboratory
Zaritsky, Dennis
United States, Tucson
The University of Arizona
Ziegler, Bodo L.
Austria, Vienna
Universität Wien
Statistics
Citations: 32
Authors: 32
Affiliations: 18
Identifiers
Doi:
10.1051/0004-6361/201321208
ISSN:
00046361
e-ISSN:
14320746
Study Design
Cross Sectional Study
Study Approach
Quantitative