On the Physical Requirements for a Pre-Reionization Origin of the Unresolved Near-Infrared Background

Abstract

The study of the Cosmic Near-Infrared Background (CIB) light after subtraction of resolved sources can push the limits of current observations and infer the level of galaxy and black hole activity in the early universe. However, disentangling the relative contribution from low- and high-redshift sources is not trivial. Spatial fluctuations of the CIB exhibit a clustering excess at angular scales $\sim 1^{\circ }$ whose origin has not been conclusively identified. We explore the likelihood that this signal is dominated by emission from galaxies and accreting black holes in the early Universe. We find that, if the first small mass galaxies have a normal IMF, the light of their ageing stars (fossils) integrated over cosmic time contributes a comparable amount to the CIB as their pre-reionization progenitors. However, the measured fluctuation signal is too large to be produced by galaxies at redshifts $z>8$ unless their star formation efficiencies are much larger than those inferred from the observed Lyman-dropout population. In order to produce the observed level of CIB fluctuation without violating constraints from galaxy counts and the electron optical depth of the IGM, minihalos at $z>12$ must form stars with efficiency $f_{\star }\gtrsim 0.1$ and, although a top-heavy IMF is preferred, have a very low escape fraction of ionizing radiation, $f_{\mathrm{esc}}<0.01$. If instead the CIB fluctuations are produced by high-$z$ black holes, one requires vigorous accretion in the early universe reaching ${\rho }_{\mathrm{acc}}\gtrsim 10^5{M}_{\odot }\mathrm{Mp}{\mathrm{c}}^{-3}$ by $z\simeq 10$. This growth must stop by $z\sim 6$ and be significantly obscured not to overproduce the soft cosmic X-ray background (CXB) and its observed coherence with the CIB. We therefore find the range of suitable possibilities at high-$z$ to be narrow, but could possibly be widened by including additional physics and evolution at those epochs.

13 pages, 11 figures. Accepted for publication in MNRAS

References in corpus (20)

• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• The Imprint of The Extragalactic Background Light in the Gamma-Ray Spectra of Blazars
• New limits on the density of the extragalactic background light in the optical to the far-infrared from the spectra of all known TeV blazars
• The Star Formation Histories of Local Group Dwarf Galaxies II. Searching For Signatures of Reionization
• Two populations of metal-free stars in the early Universe
• The luminosity function, halo masses and stellar masses of luminous Lyman-break galaxies at redshifts 5<z<6
• On the Origin of Near-Infrared Extragalactic Background Light Anisotropy
• Recovery from population III supernova explosions and the onset of second generation star formation
• The Fate of the First Galaxies. III. Properties of Primordial Dwarf Galaxies and their Impact on the Intergalactic Medium
• Constraints on the Cosmic Near Infrared Background Excess from NICMOS Deep Field Observations
• Mass without radiation: heavily obscured AGN, the X-ray Background and the Black Hole Mass Density
• Evidence for a Z < 8 Origin of the Source Subtracted Near Infrared Background
• Simulating the growth of Intermediate Mass Black Holes
• On the nature of the sources of the cosmic infrared background
• Demonstrating the negligible contribution of optical ACS/HST galaxies to source-subtracted cosmic infrared background fluctuations in deep IRAC/Spitzer images
• Reconstructing emission from pre-reionization sources with cosmic infrared background fluctuation measurements by the JWST
• Probing reionization with the cross power spectrum of 21 cm and near-infrared radiation backgrounds
• Reversal of Fortune: Increased Star Formation Efficiencies in the Early Histories of Dwarf Galaxies?
• Probing the epoch of pre-reionization by cross-correlating cosmic microwave and infrared background anisotropies

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• Lyman-tomography of cosmic infrared background fluctuations with Euclid: probing emissions and baryonic acoustic oscillations at z>10
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• The Clustering of Undetected High-redshift Black Holes and Their Signatures in Cosmic Backgrounds
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• AKARI near-infrared background fluctuations arise from normal galaxy populations
• Studying the ICM in clusters of galaxies via surface brightness fluctuations of the cosmic X-ray background
• Contribution of the first galaxies to the cosmic far-infrared/sub-millimeter background - I. Mean background level
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• Foreground and sensitivity analysis for broad band (2D) 21cm--Ly-alpha and 21cm--H-alpha correlation experiments probing the Epoch of Reionization
• Detecting high-$z$ galaxies in the Near Infrared Background
• On the origin of the optical and near-infrared extragalactic background light
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