Journal
SCIENCE
Volume 329, Issue 5994, Pages 924-927Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1185759
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Funding
- NASA
- Radcliffe Fellowship
- Guggenheim Fellowship
- CNRS
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Current efforts in observational cosmology are focused on characterizing the mass-energy content of the universe. We present results from a geometric test based on strong lensing in galaxy clusters. Based on Hubble Space Telescope images and extensive ground-based spectroscopic follow-up of the massive galaxy cluster Abell 1689, we used a parametric model to simultaneously constrain the cluster mass distribution and dark energy equation of state. Combining our cosmological constraints with those from x-ray clusters and the Wilkinson Microwave Anisotropy Probe 5-year data gives Omega(m) = 0.25 +/- 0.05 and W-x = -0.97 +/- 0.07, which are consistent with results from other methods. Inclusion of our method with all other available techniques brings down the current 2 sigma contours on the dark energy equation-of-state parameter W-x by similar to 30%.
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