A cross-correlation of WMAP and ROSAT

Abstract

We cross-correlate the recent CMB WMAP 1 year data with the diffuse soft X-ray background map of ROSAT. We look for common signatures due to galaxy clusters (SZ effect in CMB, bremsstrahlung in X-rays) by cross-correlating the two maps in real and in Fourier space. We do not find any significant correlation and we explore the different reasons for this lack of correlation. The most likely candidates are the possibility that we live in a low ${\sigma }_8$ universe (${\sigma }_8<0.9$) and/or systematic effects in the data especially in the diffuse X-ray maps which may suffer from significant cluster signal subtraction during the point source removal process.

To appear in New Astronomy Reviews, Proceedings of the CMBNET Meeting, 20-21 February, 2003, Oxford, UK

References in corpus (2)

• The Anisotropy of the Microwave Background to l = 3500: Deep Field Observations with the Cosmic Background Imager
• A cross-correlation of WMAP and ROSAT

Cited by in corpus (4)

• The imprints of local superclusters on the Sunyaev-Zel'dovich signals and their detectability with Planck
• Secondary non-Gaussianity and Cross-Correlation Analysis
• A full sky prediction of the SZ effect from diffuse hot gas in the local universe and the upper limit from the WMAP data
• A cross-correlation of WMAP and ROSAT