The cross-correlation between the microwave and X-ray backgrounds: foregrounds and systematics

2004/08/12 by Stephen Boughn, S. P. Boughn, Robert Crittenden
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.1111/j.1365-2966.2005.09090.x

published as Mon.Not.Roy.Astron.Soc. 360 (2005) 1013-1021 · 8 pages, 7 eps figures

arxiv created 2004/08/12 · openalex publication_date 2005/06/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Recently, we presented evidence for a cross-correlation of the WMAP satellite map of the cosmic microwave background (CMB) and the HEAO1 satellite map of the hard X-ray background (XRB) with a dimensionless amplitude of 0.14 ± 0.05 normalized to the product of the rms fluctuations of the CMB and XRB. Such a correlation is expected in a universe dominated by a cosmological constant via the integrated Sachs-Wolfe (ISW) effect and the level of the correlation observed is consistent with that predicted by the currently favoured Lambda cold dark matter model of the Universe. As this offers independent confirmation of the cosmological model, it is important to verify the origin of the correlation. Here we explore in detail some possible foreground sources of the correlation. The present evidence all supports an ISW origin.

Citations

• Measurement of the gravitational potential evolution from the cross-correlation betweenWMAPand the APM Galaxy Survey
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• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
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