Measuring the Thermal Sunyaev-Zel'dovich Effect Through the Cross Correlation of Planck and WMAP with ROSAT
Abstract
We measure a significant correlation between the thermal Sunyaev-Zel'dovich effect in the Planck and WMAP maps and an X-ray cluster map based on ROSAT. Our measurement yields a direct characterization of the cluster power spectrum over a wide range of angular scales that is consistent with large cosmological simulations. We check for contamination from dusty galaxies using the cross correlations with the 220, 545 and 843 GHz maps from Planck. The amplitude of this signal depends on cosmological parameters that determine the growth of structure (σ8 and ΩM) and scales as σ87.4 and ΩM1.9 around the multipole (ell) ~ 1000. We constrain σ8 and ΩM from the cross-power spectrum to be σ8 (ΩM/0.30)0.26 = 0.8 +/- 0.02. In principle this analysis can be extended beyond σ8 and ΩM to constrain dark energy or the sum of the neutrino masses.
- Publication:
-
American Astronomical Society Meeting Abstracts #223
- Pub Date:
- January 2014
- Bibcode:
- 2014AAS...22320405B