A Cross-Correlation Analysis of WMAP and EGRET Data in Wavelet Space

2005/11/18 by Xin Liu, Shuang‐Nan Zhang, Shuang Nan Zhang
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Gravitation Theories #Radio Astronomy Observations and Technology #astro-ph

paper · pdf · doi:10.1086/499804

published as Astrophys.J.636:L1-L4,2006 · 4 pages, 7 figures; accepted for publication in ApJL

arxiv created 2005/11/18 · openalex publication_date 2005/12/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31

Abstract

We cross-correlate the first-year Wilkinson Mic rowa ve Anisotrop y P robe ( WMAP ) data and the diffuse gamma-ray intensity maps from the Energetic Gamma-Ray Experiment Telescope (EGRET) using spherical-wavelet approaches. Correlations at the 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 the most conservative WMAP foreground mask; no significant correlation is found with the Tegmark cleaned map. The detected correlation is most likely of Galactic origin and thus can help probe the origins of possible Galactic foreground residuals and ultimately remove them from measured microwave sky maps.

Citations

• A Full‐Sky Hα Template for Microwave Foreground Prediction
• Testing for Non‐Gaussianity in theWilkinson Microwave Anisotropy ProbeData: Minkowski Functionals and the Length of the Skeleton
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• High resolution foreground cleaned CMB map from WMAP
• Correspondence Principle between Spherical and Euclidean Wavelets