1. Center for Cosmology and Astro-Particle Physics Great Lakes Cosmology Workshop VIII, June, 1-3, 2007 Probing Dark Energy with Cluster-Galaxy Weak Lensing J AIYUL Y OO AND D AVID W EINBERG D EPARTMENT OF A STRONOMY, T HE O HIO S TATE U NIVERSITY

2. cluster-matter cross correlation (profile & bias) stacking rank-ordered clusters: monotonic relation of the mean mass-observable no mass estimate of individual clusters no accurate relation to true cluster mass weak lensing of the stacked sample of clusters Cluster-Galaxy Weak Lensing PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

3. Why Robust? stacked sample PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

4. Why Robust? stacked sample PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

5. Why Robust? stacked sample ≅ mass-ordered clusters PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

6. Why Robust? stacked sample ≅ mass-ordered clusters works for arbitrary relation and bias PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

7. Cosmological Probe? stacked sample is set by cosmology! growth factor, volume, halo mass function (given number of clusters) constituent clusters are also different! PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

8. Prediction and Observable PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING angular diameter distance critical surface density

9. clusters provide high S/N (vs cosmic shear) spherical symmetric dark matter halo apparent lens center (central cD galaxies) stacking increases S/N → high redshift clusters tangential shear profile Why Better? clusters provide high S/N (vs cosmic shear) spherical symmetric dark matter halo apparent lens center (central cD galaxies) stacking increases S/N → high redshift clusters tangential shear profile PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

10. Parameter Sensitivity PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

11. Parameter Sensitivity PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING

12. Dark Energy Constraint PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING DES type survey 1,2,3 σ contours no CMB priors flat universe

13. Conclusion and Prospects novel method of cluster-galaxy weak lensing works for arbitrary mass-observables robust to scatter and bias readily applicable, strong constraints application to OSU Dark Energy Survey with Large Binocular Telescope (LBT) PROBING DARK ENERGY WITH CLUSTER-GALAXY WEAK LENSING Stay “fine” tuned!!!