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

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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
Original languageEnglish
Pages (from-to)1013-1021
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume360
Issue number3
DOIs
Publication statusPublished - 2005

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