Investigating the origins of the CMB-XRB cross correlation

Details Investigating the origins of the CMB-XRB cross correlation Investigating the origins of the CMB-XRB cross correlation

2004-08-12

arxiv.org/abs/astro-ph/0408242v1

Mon.Not.Roy.Astron.Soc. 360 (2005) 1013-1021

Astronomy and Astrophysics

Astrophysics

8 pages, 7 eps figures

Scientific paper

10.1111/j.1365-2966.2005.09090.x

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 (Boughn & Crittenden, 2004). 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 favored Lambda cold dark matter model of the universe. Since 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.

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