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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Subaru weak lensing measurement of a z = 0.81 cluster discovered by the Atacama Cosmology Telescope Survey
Monthly Notices of the Royal Astronomical Society, Volume 429, No. 4, Year 2013
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Description
We present a Subaru weak lensing measurement ofACT-CL J0022.2-0036, one of themost luminous, high-redshift (z = 0.81) Sunyaev-Zel'dovich (SZ) clusters discovered in the 268 deg2 equatorial region survey of the Atacama Cosmology Telescope that overlaps with Sloan Digital Sky Survey (SDSS) Stripe 82 field. Ours is the first weak lensing study with Subaru at such high redshifts. For the weak lensing analysis using i'-band images, we use a model-fitting (Gauss-Laguerre shapelet) method to measure shapes of galaxy images, where we fit galaxy images in different exposures simultaneously to obtain best-fitting ellipticities taking into account the different point spread functions (PSFs) in each exposure. We also take into account the astrometric distortion effect on galaxy images by performing the model fitting in the world coordinate system. To select background galaxies behind the cluster at z = 0.81, we use photometric redshift estimates for every galaxy derived from the co-added images of multi-passband Br'i'z'Y, with PSF matching/homogenization. After a photometric redshift cut for background galaxy selection, we detect the tangential weak lensing distortion signal with a total signal-tonoise ratio of about 3.7. By fitting a Navarro-Frenk-White model to the measured shear profile,we find the cluster mass to be M200-ρm = [7.5-2.8+3.2(stat.)-0.6+1.3(sys.)]×1014M⊙ h-1. The weak lensing-derived mass is consistent with previous mass estimates based on the SZ observation, with assumptions of hydrostatic equilibrium and virial theorem, as well as with scaling relations between SZ signal and mass derived from weak lensing, X-ray and velocity dispersion, within the measurement errors. We also show that the existence of ACT-CL J0022.2-0036 at z = 0.81 is consistent with the cluster abundance prediction of the Λ-dominated cold dark matter structure formation model. We thus demonstrate the capability of Subaru-type ground-based images for studying weak lensing of high-redshift clusters. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Miyatake, Hironao
Japan, Tokyo
The University of Tokyo
United States, Princeton
Princeton University
Nishizawa, Atsushi J.
Japan, Tokyo
The University of Tokyo
Takada, Masahiro
Japan, Tokyo
The University of Tokyo
Mandelbaum, Rachel
United States, Princeton
Princeton University
United States, Pittsburgh
Carnegie Mellon University
Mineo, Sogo
Japan, Tokyo
The University of Tokyo
Aihara, Hiroaki
Japan, Tokyo
The University of Tokyo
Spergel, David N.
Japan, Tokyo
The University of Tokyo
United States, Princeton
Princeton University
Bickerton, Steven J.
Japan, Tokyo
The University of Tokyo
United States, Princeton
Princeton University
Bond, J. Richard
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Gralla, Megan B.
United States, Baltimore
Johns Hopkins University
Hajian, Amir
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Hilton, Matt
United Kingdom, Nottingham
University of Nottingham
South Africa, Durban
University of Kwazulu-natal
Hincks, Adam D.
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Hughes, John P.
United States, New Brunswick
Rutgers University–new Brunswick
Infante, Leopoldo
Chile, Santiago
Pontificia Universidad Católica de Chile
Lin, Yen Ting
Taiwan, Taipei
Academia Sinica, Institute of Astronomy and Astrophysics
Lupton, Robert H.
United States, Princeton
Princeton University
Marriage, Tobias A.
United States, Baltimore
Johns Hopkins University
Marsden, Danica W.
United States, Santa Barbara
University of California, Santa Barbara
Menanteau, Felipe
United States, New Brunswick
Rutgers University–new Brunswick
Miyazaki, Satoshi
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Moodley, Kavilan
South Africa, Durban
University of Kwazulu-natal
Niemack, Michael D.
United States, Gaithersburg
National Institute of Standards and Technology
Oguri, Masamune
Japan, Tokyo
The University of Tokyo
Price, Paul A.
United States, Princeton
Princeton University
Reese, Erik D.
United States, Philadelphia
University of Pennsylvania
Sifón, Cristóbal
Chile, Santiago
Pontificia Universidad Católica de Chile
Netherlands, Leiden
Sterrewacht Leiden
Wollack, Edward J.
United States, Greenbelt
Nasa Goddard Space Flight Center
Yasuda, Naoki
Japan, Tokyo
The University of Tokyo
Statistics
Citations: 29
Authors: 29
Affiliations: 16
Identifiers
Doi:
10.1093/mnras/sts643
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Case-Control Study
Study Approach
Quantitative