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We cross-correlate the 100 um Improved Reprocessing of the IRAS Survey (IRIS)map and galaxy clusters at 0.1 < z < 0.3 in the maxBCG catalogue taken from theSloan Digital Sky Survey, measuring an angular cross-power spectrum overmultipole moments 150 < l < 3000 at a total significance of over 40 sigma. Thecross-spectrum, which arises from the spatial correlation between unresolveddusty galaxies that make up the cosmic infrared background (CIB) in the IRISmap and the galaxy clusters, is well-fit by a single power law with an index of-1.28 +/- 0.12, similar to the clustering of unresolved galaxies fromcross-correlating far-infrared and submillimetre maps at longer wavelengths.Using a recent, phenomenological model for the spectral and clusteringproperties of the IRIS galaxies, we constrain the large-scale bias of themaxBCG clusters to be 2.6 +/- 1.4, consistent with existing analyses of thereal-space cluster correlation function. The success of our method suggeststhat future CIB-optical cross-correlations using Planck and Herschel data willsignificantly improve our understanding of the clustering and redshiftdistribution of the faint CIB sources.

A High-Significance Measurement of Correlation Between Unresolved IRAS Sources and Optically-Selected Galaxy Clusters