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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Scaling relations and overabundance of massive clusters at z ≳ 1 from weak-lensing studies with the hubble space telescope
Astrophysical Journal, Volume 737, No. 2, Article 59, Year 2011
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Description
We present weak gravitational lensing analysis of 22 high-redshift (z ≳ 1) clusters based on Hubble Space Telescope images. Most clusters in our sample provide significant lensing signals and are well detected in their reconstructed two-dimensional mass maps. Combining the current results and our previous weak-lensing studies of five other high-z clusters, we compare gravitational lensing masses of these clusters with other observables. We revisit the question whether the presence of the most massive clusters in our sample is in tension with the current ΛCDM structure formation paradigm. We find that the lensing masses are tightly correlated with the gas temperatures and establish, for the first time, the lensing mass-temperature relation at z ≳ 1. For the power-law slope of the M-TX relation (M ∝ Tα), we obtain α = 1.54 ± 0.23. This is consistent with the theoretical self-similar prediction α = 3/2 and with the results previously reported in the literature for much lower redshift samples. However, our normalization is lower than the previous results by 20%-30%, indicating that the normalization in the M-TX relation might evolve. After correcting for Eddington bias and updating the discovery area with a more conservative choice, we find that the existence of the most massive clusters in our sample still provides a tension with the current ΛCDM model. The combined probability of finding the four most massive clusters in this sample after the marginalization over cosmological parameters is less than 1%. © 2011 The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Jee, Myungkook James E.
United States, Davis
University of California, Davis
Dawson, Kyle S.
United States, Salt Lake City
The University of Utah
Hoekstra, Henk
Netherlands, Leiden
Universiteit Leiden
Perlmutter, Saul
United States, Berkeley
Lawrence Berkeley National Laboratory
Rosati, P.
Germany, Garching Bei Munchen
European Southern Observatory
Brodwin, Mark
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Postman, Marc P.
United States, Baltimore
Space Telescope Science Institute
Lubin, Lori M.
United States, Davis
University of California, Davis
Meyers, Joshua E.
United States, Berkeley
Lawrence Berkeley National Laboratory
Stanford, Spencer Adam
United States, Davis
University of California, Davis
United States, Livermore
Institute of Geophysics and Planetary Physics at Lawrence Livermore National Laboratory
Barbary, Kyle
United States, Berkeley
Lawrence Berkeley National Laboratory
United States, Berkeley
University of California, Berkeley
Barrientos, F. Felipe
Chile, Santiago
Pontificia Universidad Católica de Chile
Eisenhardt, Peter R.M.
United States, Pasadena
California Institute of Technology
Ford, Holland C.
United States, Baltimore
Johns Hopkins University
Gilbank, David G.
Canada, Waterloo
University of Waterloo
Gladders, Michael D.
United States, Chicago
The University of Chicago
González, Anthony H.
United States, Gainesville
University of Florida
Lidman, Christopher E.
Australia
Australian Astronomical Observatory
Rykoff, Eli S.
United States, Berkeley
Lawrence Berkeley National Laboratory
Statistics
Citations: 102
Authors: 19
Affiliations: 16
Identifiers
Doi:
10.1088/0004-637X/737/2/59
ISSN:
0004637X