A cross-correlation of WMAP and ROSAT
نویسنده
چکیده
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 σ8 universe (σ8 < 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.
منابع مشابه
A Search for X-ray Reionization Signatures from Cross-correlation of Wmap and Rosat Rass Data
We present an observational search for the possible correlation between cosmic microwave background (CMB) polarization map and soft X-ray background (SXRB) based on the ROSAT All-sky Survey (RASS) archive and WMAP fiveyear observations. This is motivated by the fact that some of the CMB polarization may arise from the scattering of CMB photons due to the free electrons generated by X-ray heatin...
متن کاملThe SZ effect contribution to WMAP: A Cross-Correlation between WMAP and ROSAT
We cross-correlate WMAP and ROSAT and look for common features in both data sets. We detect a common structure which shows up clearly in the cross-power spectrum of the cross-correlation. This structure has a coherence length of ≈ 2◦ and its frequency dependence follows the expected SZ effect frequency dependence. Assuming that this structure is due to galaxy clusters, we compute the expected c...
متن کاملCross-correlation between WMAP and 2MASS: non-Gaussianity induced by SZ effect
We study the SZ-effect-induced non-Gaussianity in the cosmic microwave background (CMB) fluctuation maps. If a CMB map is contaminated by the SZ effect of galaxies or galaxy clusters, the CMB maps should have similar non-Gaussian features as the galaxy and cluster fields. Using the WMAP data and 2MASS galaxy catalog we show that the non-Gaussianity of the 2MASS galaxies is imprinted on WMAP map...
متن کاملThe synchrotron foreground and CMB temperature–polarization cross correlation power spectrum from the first year WMAP data
We analyse the temperature-polarization cross-correlation in the Galactic synchrotron template that we recently developed, and between the template and CMB temperature maps derived from WMAP data. Since the polarized synchrotron template itself uses WMAP data, we can estimate residual synchrotron contamination in the CMB C l angular spectrum. While C 2 appears to be contaminated by synchrotron,...
متن کاملCross-correlation Analysis of Wmap and Egret in Wavelet Space
We cross correlate the Wilkinson Microwave Anisotropy Probe (WMAP) first year data and the diffuse gamma-ray intensity maps from the Energetic Gamma Ray Experiment Telescope (EGRET) using spherical wavelet approaches. Correlations at 99.7% significance level have been detected, at scales around 15 in the WMAP foreground cleaned W-band and Q-band maps, based on data from regions that are outside...
متن کامل