The abundance of clusters at the present epoch and weak gravitational lensing shear both constrain roughly the same combination of the power spectrum normalization σ8 and matter energy density ΩM. The cluster constraint further depends on the normalization of the mass-temperature relation. Therefore, combining the weak-lensing and cluster abundance data can be used to accurately calibrate the mass-temperature relation. We discuss this approach and illustrate it using data from recent surveys.
The Astrophysical Journal
- Pub Date:
- October 2002
- Cosmology: Theory;
- Cosmology: Large-Scale Structure of Universe;
- Matches the version in ApJL. Equation 4 corrected. Improvements in the analysis move the cluster contours in Fig1 slightly upwards. No changes in the conclusions