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

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 (CIB) and Chandra-ACIS Cosmic X-ray Background (CXB) surface brightness fluctuations. Our investigation uses data from the Chandra Deep Field South (CDFS), Hubble Deep Field North (HDFN), EGS/AEGIS field and UDS/SXDF surveys, comprising 1160 Spitzer hours and $\sim$ 12 Ms of Chandra data collected over a total area of 0.3 deg${}^2$. We report the first ($>$5$\sigma$) detection of a cross-power signal on large angular scales >20 arcsec between [0.5-2] keV and the 3.6 and 4.5$\mu$m bands, at $\sim$5$\sigma$ and 6.3$\sigma$ significance, respectively. The correlation with harder X-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, including both direct collapse black holes and primordial black holes, as well as from scattering in the interstellar medium and intra-halo light.

7 pages, 3 figures, accepted by ApJ Letters, v2 slight corrections

References in corpus (45)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• Did LIGO detect dark matter?
• From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
• The synthesis of the cosmic X-ray background in the Chandra and XMM-Newton era
• The Chandra Deep Field-North Survey. XIII. 2 Ms Point-Source Catalogs
• Galaxy formation in the Planck Cosmology - I. Matching the observed evolution of star formation rates, colours and stellar masses
• The Chandra Deep Field-South Survey: 7 Ms Source Catalogs
• Supermassive black hole formation during the assembly of pre-galactic discs
• Absolute measurement of the unresolved cosmic X-ray background in the 0.5-8 keV band with Chandra
• The Chandra COSMOS Survey: III. Optical and Infrared Identification of X-ray Point Sources
• The Evolution of Normal Galaxy X-ray Emission Through Cosmic History: Constraints from the 6 Ms Chandra Deep Field-South
• The 4 Ms Chandra Deep Field-South Number Counts Apportioned by Source Class: Pervasive Active Galactic Nuclei and the Ascent of Normal Galaxies
• Tracing the first stars with cosmic infrared background fluctuations
• LIGO gravitational wave detection, primordial black holes and the near-IR cosmic infrared background anisotropies
• AEGIS-X: Deep Chandra imaging of the Central Groth Strip
• Cosmic Infrared Background and Early Galaxy Evolution
• On the Origin of Near-Infrared Extragalactic Background Light Anisotropy
• X-ray groups and clusters of galaxies in the Subaru-XMM Deep Field
• New measurements of the cosmic infrared background fluctuations in deep Spitzer/IRAC survey data and their cosmological implications
• The X-ray Star Formation Story as Told by Lyman Break Galaxies in the 4 Ms CDF-S
• Infrared background signatures of the first black holes
• The Chandra COSMOS legacy survey: Energy Spectrum of the Cosmic X-ray Background and constraints on undetected populations
• The mass function of high redshift seed black holes
• Cross-correlating cosmic IR and X-ray background fluctuations: evidence of significant black hole populations among the CIB sources
• Soft X-ray Scattering and Halos from Dust
• Reconstructing the Near-IR Background Fluctuations from known Galaxy Populations using Multiband Measurements of Luminosity Functions
• AKARI observation of the fluctuation of the near-infrared background
• The Near-IR Background Intensity and Anisotropies During The Epoch of Reionization
• Constraints on the Cosmic Near Infrared Background Excess from NICMOS Deep Field Observations
• Evidence for a Z < 8 Origin of the Source Subtracted Near Infrared Background
• Ultra-deep catalog of X-ray groups in the Extended Chandra Deep Field South
• Detection of small scale fluctuations in the near-IR cosmic infrared background from long exposure 2MASS fields
• On the nature of the sources of the cosmic infrared background
• The Chandra X-ray point source catalog in the DEEP2 Galaxy Redshift Survey fields
• X-Ray Groups of Galaxies in the Aegis Deep and Wide Fields
• The Contribution of z<6 Sources to the Spatial Coherence in the Unresolved Cosmic near-Infrared and X-ray Backgrounds
• On the Physical Requirements for a Pre-Reionization Origin of the Unresolved Near-Infrared Background
• Cosmic Infrared Background Fluctuations in Deep Spitzer IRAC Images: Data Processing and Analysis
• Analysis of the diffuse near-IR emission from 2MASS deep integration data: foregrounds vs the cosmic infrared background
• AKARI Observation of the Sub-degree Scale Fluctuation of the Near-infrared Background
• Reconstructing emission from pre-reionization sources with cosmic infrared background fluctuation measurements by the JWST
• Cross-correlation between X-ray and optical/near-infrared background intensity fluctuations
• A thin diffuse component of the Galactic Ridge X-ray emission and heating of the interstellar medium contributed by the radiation of Galactic X-ray binaries
• The evolution of star formation activity in galaxy groups
• Can AGN and galaxy clusters explain the surface brightness fluctuations of the cosmic X-ray background?

Cited by in corpus (23)

• Euclid. I. Overview of the Euclid mission
• Primordial Black Holes as Generators of Cosmic Structures
• Clusters of primordial black holes
• The Observational Signatures of Supermassive Black Hole Seeds
• Searching for the 3.5 keV Line in the Deep Fields with Chandra: the 10 Ms observations
• Looking at cosmic near-infrared background radiation anisotropies
• Illuminating the dark ages: Cosmic backgrounds from accretion onto primordial black hole dark matter
• Detecting the Stochastic Gravitational Wave Background from Primordial Black Hole Formation
• Electromagnetic probes of primordial black holes as dark matter
• The SPLASH and Chandra COSMOS Legacy Survey: the Cross Power Between Near-Infrared and X-Ray Background Fluctuations
• Fluctuation of the background sky in the Hubble Extremely Deep Field (XDF) and its origin
• Searching for axion-like particle decay in the near-infrared background: an updated analysis
• Probing the cross-power of unresolved cosmic infrared and X-ray backgrounds with upcoming space missions
• The isotropic interplanetary dust cloud and near-infrared extragalactic background light observed with COBE/DIRBE
• Growing up in a megalopolis: Environmental effects on galaxy evolution in a supercluster at z~0.65 in UKIDSS UDS
• New metrics to probe the dynamical state of galaxy clusters
• The Clustering of Undetected High-redshift Black Holes and Their Signatures in Cosmic Backgrounds
• The effect of Primordial Black Holes and streaming motions on structure formation
• Quantifying Observational Projection Effects with a Simulation-based hot CGM model
• Constraints on galaxy formation from the cosmic-far-infrared-background\,$-$\,optical-imaging cross-correlation using \textit{Herschel} and UNIONS
• On the origin of the optical and near-infrared extragalactic background light
• Spectral Properties Of Populations Behind The Coherence In Spitzer Near-Infrared And Chandra X-Ray Backgrounds
• Revisiting Galaxy Cluster Scaling Relations through Dark Matter-Gas Coherence: Scatter Dependence on Dynamical State