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We present new measurements of the large scale clustering component of thecross-power spectra of the source-subtracted Spitzer-IRAC Cosmic InfraredBackground (CIB) and Chandra-ACIS Cosmic X-ray Background (CXB) surfacebrightness fluctuations. Our investigation uses data from the Chandra DeepField South (CDFS), Hubble Deep Field North (HDFN), EGS/AEGIS field andUDS/SXDF surveys, comprising 1160 Spitzer hours and $\sim$ 12 Ms of Chandradata collected over a total area of 0.3 deg$^2$. We report the first($>$5$\sigma$) detection of a cross-power signal on large angular scales >20arcsec between [0.5-2] keV and the 3.6 and 4.5$\mu$m bands, at $\sim$5$\sigma$and 6.3$\sigma$ significance, respectively. The correlation with harder X-raybands is marginally significant. Comparing the new observations with existingmodels for the contribution of the known unmasked source population at $z<$7,we find an excess of about an order of magnitude at 5$\sigma$ confidence. Wediscuss possible interpretations for the origin of this excess in terms of thecontribution from accreting early black holes, including both direct collapseblack holes and primordial black holes, as well as from scattering in theinterstellar medium and intra-halo light.

Probing large scale coherence between Spitzer IR and Chandra X-ray source-subtracted cosmic backgrounds