Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 440, Issue 2, Pages 1322-1344Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu145
Keywords
gravitational lensing: weak; surveys; cosmology: observations
Categories
Funding
- US Department of Energy's Office of High Energy Physics [DE-AC02-05CH11231, DE-FG03-02-ER40701, DE-SC0006624]
- US National Science Foundation [AST-0807337]
- Alfred P. Sloan Foundation
- David & Lucile Packard Foundation
- NASA [HST-HF-01199.02-A, NAS 5-26555, 08-ADP08-0019]
- Space Telescope Science Institute
- DOE
- Swiss National Foundation [200021-116696/1]
- WCU [R32-10130]
- NSF [AST-0607701, 0908246, 0908442, 0908354, 1135622, AST95-09298, AST-0071048, AST-0071198, AST-0507428, AST-0507483]
- NASA LTSA [NNG04GC89G]
- W. M. Keck Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- Division Of Physics
- Direct For Mathematical & Physical Scien [1135622] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0006624] Funding Source: U.S. Department of Energy (DOE)
Ask authors/readers for more resources
Statistical weak lensing by large-scale structure - cosmic shear - is a promising cosmological tool, which has motivated the design of several large upcoming surveys. Here, we present a measurement of cosmic shear using co-added Sloan Digital Sky Survey (SDSS) imaging in 168 square degrees of the equatorial region, with r < 23.5 and i < 22.5, a source number density of 2.2 per arcmin(2) and mean redshift of z(med) = 0.52. These co-adds were generated using a new method described in the companion Paper I that was intended to minimize systematic errors in the lensing measurement due to coherent point spread function anisotropies that are otherwise prevalent in the SDSS imaging data. We present measurements of cosmic shear out to angular separations of 2 degrees, along with systematics tests that (combined with those from Paper I on the catalogue generation) demonstrate that our results are dominated by statistical rather than systematic errors. Assuming a cosmological model corresponding to Wilkinson Microwave Anisotropy Probe 7(WMAP7) and allowing only the amplitude of matter fluctuations sigma(8) to vary, we find a best-fitting value of sigma(8)=0.636(-0.154)(+0.109) (1 sigma); without systematic errors this would be sigma(8)=0.636(-0.137)(+0.099) (1 sigma). Assuming a flat Lambda cold dark matter model, the combined constraints with WMAP7 are sigma(8)=0.784(-0.026)(+0.028)(1 sigma)(-0.054)(+0.055)(2 sigma) and Omega(m)h(2)=0.1303(-0.0048)(+0.0047)(1 sigma)(-0.009)(+0.009)(2 sigma); the 2 sigma error ranges are, respectively, 14 and 17 per cent smaller than WMAP7 alone.
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