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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Strong lensing by a node of the cosmic web: The core of MACS J0717.5+3745 at z = 0.55
Astronomy and Astrophysics, Volume 544, Article A71, Year 2012
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Description
We present results of a strong-lensing analysis of MACS J0717.5+3745 (hereafter MACS J0717), an extremely X-ray luminous galaxy cluster at z = 0.55. Observations at different wavelengths reveal a complex and dynamically very active cluster, whose core is connected to a large scale filament extended over several Mpc. Using multi-passband imaging data obtained with the Hubble Space Telescope's Advanced Camera for Surveys (ACS), we identify 15 multiply imaged systems across the full field of view of ACS, five of which we confirmed spectroscopically in ground-based follow-up observations with the Keck telescope. We use these multiply imaged systems to constrain a parametric model of the mass distribution in the cluster core, employing a new parallelized version of the Lenstool software. The main result is that the most probable description of the mass distribution comprises four cluster-scale dark matter haloes. The total mass distribution follows the light distribution but strongly deviates from the distribution of the intra-cluster gas as traced by the X-ray surface brightness. This confirms the complex morphology proposed by previous studies. We interpret this segregation of collisional and collisionless matter as strong evidence of multiple mergers and ongoing dynamical activity. MACS J0717 thus constitutes one of the most disturbed clusters presently known and, featuring a projected mass within the ACS field of view (R = 150″ = 960 kpc) of 2.11 ± 0.23 × 1015 M⊙, the system is also one of the most massive known. © 2012 ESO.
Authors & Co-Authors
Limousin, Marceau
France, Paris
Cnrs Centre National de la Recherche Scientifique
Denmark, Copenhagen
Niels Bohr Institutet
Ebeling, Harald
United States, Honolulu
University Hawaii Institute for Astronomy
Richard, Johan
France, Villeurbanne
Université Claude Bernard Lyon 1
Swinbank, A. Mark
United Kingdom, Durham
Durham University
Smith, Graham P.
United Kingdom, Birmingham
University of Birmingham
United States, Pasadena
California Institute of Technology
Jauzac, Mathilde
France, Paris
Cnrs Centre National de la Recherche Scientifique
South Africa, Durban
University of Kwazulu-natal
Rodionov, S.
France, Paris
Cnrs Centre National de la Recherche Scientifique
Ma, Chengjiun
Canada, Waterloo
University of Waterloo
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Smail, Ian R.
United Kingdom, Durham
Durham University
Edge, Alastair C.
United Kingdom, Durham
Durham University
Jullo, Eric
France, Paris
Cnrs Centre National de la Recherche Scientifique
United States, Pasadena
Jet Propulsion Laboratory
Kneib, Jean Paul
France, Paris
Cnrs Centre National de la Recherche Scientifique
Statistics
Citations: 67
Authors: 12
Affiliations: 11
Identifiers
Doi:
10.1051/0004-6361/201117921
ISSN:
00046361
e-ISSN:
14320746
Study Design
Cross Sectional Study
Cohort Study