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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Mass profile and dynamical status of the z ∼ 0.8 galaxy cluster LCDCS 0504
Astronomy and Astrophysics, Volume 566, Article A149, Year 2014
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Description
Context. Constraints on the mass distribution in high-redshift clusters of galaxies are currently not very strong. Aims. We aim to constrain the mass profile, M(r), and dynamical status of the z ≃ 0.8 LCDCS 0504 cluster of galaxies that is characterized by prominent giant gravitational arcs near its center. Methods. Our analysis is based on deep X-ray, optical, and infrared imaging as well as optical spectroscopy, collected with various instruments, which we complemented with archival data. We modeled the mass distribution of the cluster with three different mass density profiles, whose parameters were constrained by the strong lensing features of the inner cluster region, by the X-ray emission from the intracluster medium, and by the kinematics of 71 cluster members. Results. We obtain consistent M(r) determinations from three methods based on kinematics (dispersion-kurtosis, caustics, and MAMPOSSt), out to the cluster virial radius, ≃ 1.3 Mpc and beyond. The mass profile inferred by the strong lensing analysis in the central cluster region is slightly higher than, but still consistent with, the kinematics estimate. On the other hand, the X-ray based M(r) is significantly lower than the kinematics and strong lensing estimates. Theoretical predictions from ΛCDM cosmology for the concentration-mass relation agree with our observational results, when taking into account the uncertainties in the observational and theoretical estimates. There appears to be a central deficit in the intracluster gas mass fraction compared with nearby clusters. Conclusions. Despite the relaxed appearance of this cluster, the determinations of its mass profile by different probes show substantial discrepancies, the origin of which remains to be determined. The extension of a dynamical analysis similar to that of other clusters of the DAFT/FADA survey with multiwavelength data of sufficient quality will allow shedding light on the possible systematics that affect the determination of mass profiles of high-z clusters, which is possibly related to our incomplete understanding of intracluster baryon physics. © ESO, 2014.
Authors & Co-Authors
Guennou, Loïc
South Africa, Durban
University of Kwazulu-natal
France, Marseille
Laboratoire D'astrophysique de Marseille
Biviano, Andrea
Italy, Trieste
Osservatorio Astronomico Di Trieste
France, Paris
Institut D’astrophysique de Paris
Adami, Christophe
France, Marseille
Laboratoire D'astrophysique de Marseille
Limousin, Marceau
France, Marseille
Laboratoire D'astrophysique de Marseille
Lima Neto, G. B.
Brazil, Sao Paulo
Universidade de São Paulo
Mamon, Gary A.
France, Paris
Institut D’astrophysique de Paris
Ulmer, M. P.
United States, Evanston
Northwestern University
Gavazzi, Raphaël
France, Paris
Institut D’astrophysique de Paris
Cypriano, Eduardo S.
Brazil, Sao Paulo
Universidade de São Paulo
Durret, Florence
France, Paris
Institut D’astrophysique de Paris
Clowe, Douglas
United States, Athens
Ohio University
Lebrun, V.
France, Marseille
Laboratoire D'astrophysique de Marseille
Allam, Sahar S.
United States, Batavia
Fermi National Accelerator Laboratory
United States, Baltimore
Space Telescope Science Institute
Basa, Stéphane
France, Marseille
Laboratoire D'astrophysique de Marseille
Benoist, Christophe O.
France, Nice
Bd de L’observatoire
Cappi, Alberto
France, Nice
Bd de L’observatoire
Italy, Bologna
Osservatorio Astronomico Di Bologna
Halliday, C.
Unknown Affiliation
Ilbert, Olivier
France, Marseille
Laboratoire D'astrophysique de Marseille
Johnston, David E.
United States, Batavia
Fermi National Accelerator Laboratory
Jullo, Eric
France, Marseille
Laboratoire D'astrophysique de Marseille
Just, D.
United States, Tucson
The University of Arizona
Canada, Toronto
University of Toronto
Kubo, J. M.
United States, Batavia
Fermi National Accelerator Laboratory
Márquez, I.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Marshall, Philip J.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Martinet, N.
France, Paris
Institut D’astrophysique de Paris
Maurogordato, Sophie
France, Nice
Bd de L’observatoire
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
Bd de L’observatoire
Russeil, Delphine
France, Marseille
Laboratoire D'astrophysique de Marseille
Schirmer, M.
United States, Hilo
Gemini Observatory
Germany, Bonn
Universität Bonn
Schrabback, Tim
United States, Santa Barbara
University of California, Santa Barbara
Slezak, Éric
France, Nice
Bd de L’observatoire
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: 37
Authors: 37
Affiliations: 20
Identifiers
Doi:
10.1051/0004-6361/201322447
ISSN:
00046361
e-ISSN:
14320746
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative