We perform a cosmological parameter analysis of the 75 deg2 CTIO lensing survey in conjunction with cosmic microwave background (CMB) and Type Ia supernovae data. For ΛCDM cosmologies, we find that the amplitude of the power spectrum at low redshift is given by σ8=0.81+0.15-0.10 (95% confidence level), where the error bound includes both statistical and systematic errors. The total of all systematic errors is smaller than the statistical errors, but they do make up a significant fraction of the error budget. We find that weak lensing improves the constraints on dark energy as well. The (constant) dark energy equation of state parameter, w, is measured to be -0.89+0.16-0.21 (95% c.l.). Marginalizing over a constant w slightly changes the estimate of σ8 to 0.79+0.17-0.14 (95% c.l.). We also investigate variable w cosmologies but find that the constraints weaken considerably; next-generation surveys are needed to obtain meaningful constraints on the possible time evolution of dark energy.
The Astrophysical Journal
- Pub Date:
- June 2006
- Cosmology: Gravitational Lensing;
- Cosmology: Large-Scale Structure of Universe;
- 10 pages, 4 figures, v3 matches version accepted by ApJ. Significant changes in section 4.2.3. Otherwise, mostly minor changes