TY - JOUR
T1 - Probing Large-scale Coherence between Spitzer IR and Chandra X-Ray Source-subtracted Cosmic Backgrounds
AU - Cappelluti, N.
AU - Arendt, R.
AU - Kashlinsky, A.
AU - Li, Y.
AU - Hasinger, G.
AU - Helgason, K.
AU - Urry, M.
AU - Natarajan, P.
AU - Finoguenov, A.
N1 - Funding Information:
N.C. thanks Yale University for the YCAA Prize Postdoctoral Fellowship. We acknowledge NASA ADAP grant NNX16AF29G, Chandra SAO grant AR6-17017B, Chandra SAO grant GO5-16150A, and NASA/12-EUCLID11-0003. Facilities: CXO (ACIS), Spitzer (IRAC).
PY - 2017/9/20
Y1 - 2017/9/20
N2 - 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 ∼12 Ms of Chandra data collected over a total area of 0.3 deg2. We report the first (>5σ) detection of a cross-power signal on large angular scales >20″ between [0.5-2] keV and the 3.6 and 4.5 μm bands, at ∼5σ and 6.3σ 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 5σ 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.
AB - 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 ∼12 Ms of Chandra data collected over a total area of 0.3 deg2. We report the first (>5σ) detection of a cross-power signal on large angular scales >20″ between [0.5-2] keV and the 3.6 and 4.5 μm bands, at ∼5σ and 6.3σ 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 5σ 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.
KW - X-rays: diffuse background
KW - cosmology: observations
KW - diffuse radiation
KW - infrared: diffuse background
KW - quasars: supermassive black holes
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U2 - 10.3847/2041-8213/aa8acd
DO - 10.3847/2041-8213/aa8acd
M3 - Article
AN - SCOPUS:85030791116
VL - 847
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L11
ER -