Cross-correlating the Microwave Sky with Galaxy Surveys
Astrophysics
2007-05-23 v3
Abstract
We present results for the cross-correlation between the WMAP 1st-year cosmic microwave background (CMB) anisotropy data and optical galaxy surveys: the APM and SDSS DR1 catalogs. Our measurement of a positive CMB-galaxy correlation on large angles (\theta > 4 deg) yields significant detections of the Integrated Sachs-Wolfe (ISW) effect and provides a new estimate of dark-energy in the universe, \Omega_\Lambda=0.69-0.86 (2 \sigma range). In addition, the correlated signal on small angles (\theta<1 deg) reveals the imprint left by hot intra-cluster gas in the CMB photons: the thermal Sunyaev-Zeldovich (SZ) effect
Keywords
Cite
@article{arxiv.astro-ph/0310450,
title = {Cross-correlating the Microwave Sky with Galaxy Surveys},
author = {Pablo Fosalba and Enrique Gaztanaga and Francisco J. Castander},
journal= {arXiv preprint arXiv:astro-ph/0310450},
year = {2007}
}
Comments
7 pages. Invited talk at XVth Rencontres de Blois (France): "Physical Cosmology", June 2003. References added