Probing Large-scale Coherence between Spitzer IR and Chandra X-Ray Source-subtracted Cosmic Backgrounds

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http://hdl.handle.net/10138/225110

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Cappelluti , N , Arendt , R , Kashlinsky , A , Li , Y , Hasinger , G , Helgason , K , Urry , M , Natarajan , P & Finoguenov , A 2017 , ' Probing Large-scale Coherence between Spitzer IR and Chandra X-Ray Source-subtracted Cosmic Backgrounds ' , Astrophysical Journal Letters , vol. 847 , no. 1 , 11 . https://doi.org/10.3847/2041-8213/aa8acd

Title: Probing Large-scale Coherence between Spitzer IR and Chandra X-Ray Source-subtracted Cosmic Backgrounds
Author: Cappelluti, N.; Arendt, R.; Kashlinsky, A.; Li, Y.; Hasinger, G.; Helgason, K.; Urry, M.; Natarajan, P.; Finoguenov, A.
Contributor: University of Helsinki, Department of Physics
Date: 2017-09-20
Language: eng
Number of pages: 7
Belongs to series: Astrophysical Journal Letters
ISSN: 2041-8205
URI: http://hdl.handle.net/10138/225110
Abstract: We present new measurements of the large-scale clustering component of the cross-power spectra of the source-subtracted Spitzer-IRAC cosmic infrared background and Chandra-ACIS cosmic X-ray background surface brightness fluctuations Our investigation uses data from the Chandra Deep Field South, Hubble Deep Field North, Extended Groth Strip/AEGIS field, and UDS/SXDF surveys, comprising 1160 Spitzer hours and similar to 12 Ms of Chandra data 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 > 20" between [0.5-2] keV and the 3.6 and 4.5 mu m bands, at similar to 5 sigma and 6.3 sigma significance, respectively. The correlation with harder X-ray bands is marginally significant. Comparing the new observations with existing models 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. We discuss possible interpretations for the origin of this excess in terms of the contribution from accreting early black holes (BHs), including both direct collapse BHs and primordial BHs, as well as from scattering in the interstellar medium and intra-halo light.
Subject: cosmology: observations
diffuse radiation
infrared: diffuse background
quasars: supermassive black holes
X-rays: diffuse background
BLACK-HOLES
DEEP FIELD
FLUCTUATIONS
EVOLUTION
GALAXIES
COSMOLOGY
ORIGIN
LIGHT
115 Astronomy, Space science
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