HERA Phase I Limits on the Cosmic 21-cm Signal: Constraints on Astrophysics and Cosmology During the Epoch of Reionization

Abstract

Recently, the Hydrogen Epoch of Reionization Array (HERA) collaboration has produced the experiment's first upper limits on the power spectrum of 21-cm fluctuations at z~8 and 10. Here, we use several independent theoretical models to infer constraints on the intergalactic medium (IGM) and galaxies during the epoch of reionization (EoR) from these limits. We find that the IGM must have been heated above the adiabatic cooling threshold by z~8, independent of uncertainties about the IGM ionization state and the nature of the radio background. Combining HERA limits with galaxy and EoR observations constrains the spin temperature of the z~8 neutral IGM to 27 K < T_S < 630 K (2.3 K < T_S < 640 K) at 68% (95%) confidence. They therefore also place a lower bound on X-ray heating, a previously unconstrained aspects of early galaxies. For example, if the CMB dominates the z~8 radio background, the new HERA limits imply that the first galaxies produced X-rays more efficiently than local ones (with soft band X-ray luminosities per star formation rate constrained to L_X/SFR = { 10^40.2, 10^41.9 } erg/s/(M_sun/yr) at 68% confidence), consistent with expectations of X-ray binaries in low-metallicity environments. The z~10 limits require even earlier heating if dark-matter interactions (e.g., through millicharges) cool down the hydrogen gas. Using a model in which an extra radio background is produced by galaxies, we rule out (at 95% confidence) the combination of high radio and low X-ray luminosities of L_{r,ν}/SFR > 3.9 x 10^24 W/Hz/(M_sun/yr) and L_X/SFR<10^40 erg/s/(M_sun/yr). The new HERA upper limits neither support nor disfavor a cosmological interpretation of the recent EDGES detection. The analysis framework described here provides a foundation for the interpretation of future HERA results.

40 pages, 19 figures, accepted to ApJ

References in corpus (55)

• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• Massloss of galaxies due to a UV-background
• Model-independent evidence in favor of an end to reionization by z~6
• Efficient Simulations of Early Structure Formation and Reionization
• A Luminous Quasar at Redshift 7.642
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• Pōniuā'ena: A Luminous $z=7.5$ Quasar Hosting a 1.5 Billion Solar Mass Black Hole
• Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at $\mathbf{z}\approx 9.1$ from LOFAR
• The Global 21 Centimeter Background from High Redshifts
• New observations of z~7 galaxies: evidence for a patchy reionization
• 21CMMC: an MCMC analysis tool enabling astrophysical parameter studies of the cosmic 21 cm signal
• Inferences on the Timeline of Reionization at z~8 From the KMOS Lens-Amplified Spectroscopic Survey
• Deep multi-redshift limits on Epoch of Reionisation 21cm Power Spectra from Four Seasons of Murchison Widefield Array Observations
• The CMBR fluctuations from HI perturbations prior to reionization
• The First Billion Years Project: The escape fraction of ionizing photons in the epoch of reionization
• Evolution of the 21 cm signal throughout cosmic history
• Can the intergalactic medium cause a rapid drop in Lyman alpha emission at z>6?
• Signature of Excess Radio Background in the 21-cm Global Signal and Power Spectrum
• Feedback-regulated star formation and escape of LyC photons from mini-haloes during reionisation
• LOFAR/H-ATLAS: The low-frequency radio luminosity - star-formation rate relation
• A Significantly Neutral Intergalactic Medium Around the Luminous z=7 Quasar J0252-0503
• A Method for 21cm Power Spectrum Estimation in the Presence of Foregrounds
• A Simple Technique for Predicting High-Redshift Galaxy Evolution
• Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array
• LOFAR/H-ATLAS: A deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field
• The Global 21-cm Signal in the Context of the High-z Galaxy Luminosity Function
• 21cmFAST v3: A Python-integrated C code forgenerating 3D realizations of the cosmic 21cm signal
• Reionization and galaxy inference from the high-redshift Lyα forest
• Large-scale BAO signatures of the smallest galaxies
• The Effects of Dark Matter-Baryon Scattering on Redshifted 21 cm Signals
• 21 cm signal from cosmic dawn: Imprints of spin temperature fluctuations and peculiar velocities
• Constraining the intergalactic medium at $z\approx$ 9.1 using LOFAR Epoch of Reionization observations
• First Season MWA Phase II EoR Power Spectrum Results at Redshift 7
• anesthetic: nested sampling visualisation
• Emulation of reionization simulations for Bayesian inference of astrophysics parameters using neural networks
• X-ray binary formation in low-metallicity blue compact dwarf galaxies
• The subtlety of Ly-a photons: changing the expected range of the 21-cm signal
• Mitigating Internal Instrument Coupling II: A Method Demonstration with the Hydrogen Epoch of Reionization Array
• Metallicity dependence of HMXB populations
• Unveiling the nature of dark matter with high redshift 21 cm line experiments
• The Effects of Population III X-ray and Radio Backgrounds on the Cosmological 21-cm Signal
• Higher Order Contributions to the 21 cm Power Spectrum
• Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations
• Heating and cooling of the intergalactic medium by resonance photons
• Inference of the optical depth to reionization from low multipole temperature and polarisation Planck data
• Radio background and IGM heating due to Pop III supernovae explosions
• Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum
• Formulating and critically examining the assumptions of global 21-cm signal analyses: How to avoid the false troughs that can appear in single spectrum fits
• The Spin-Resolved Atomic Velocity Distribution and 21-cm Line Profile of Dark-Age Gas
• Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline
• RELIKE: Reionization Effective Likelihood from Planck 2018 Data
• Bayesian Model Selection with Future 21cm Observations of The Epoch of Reionisation
• Methods of Error Estimation for Delay Power Spectra in $21\text{cm}$ Cosmology
• Intergalactic heating by Lyman-alpha photons including hyperfine structure corrections

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• 21cmEMU: an emulator of 21cmFAST summary observables
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• Constraining the X-ray heating and reionization using 21-cm power spectra with Marginal Neural Ratio Estimation
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• 21cm signal sensitivity to dark matter decay
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• Assessing the impact of two independent direction-dependent calibration algorithms on the LOFAR 21-cm signal power spectrum
• Studying Cosmic Dawn using redshifted HI 21-cm signal: A brief review
• The Morphology of Reionization in a Dynamically Clumpy Universe
• The 21-cm forest as a simultaneous probe of dark matter and cosmic heating history
• Inferring Astrophysics and Dark Matter Properties from 21cm Tomography using Deep Learning
• 21cmfish: Fisher-matrix framework for fast parameter forecasts from the cosmic 21-cm signal
• Deep learning approach for identification of HII regions during reionization in 21-cm observations -- II. foreground contamination
• BEoRN: A fast and flexible framework to simulate the epoch of reionisation and cosmic dawn
• Statistical analysis of the causes of excess variance in the 21 cm signal power spectra obtained with the Low-Frequency Array
• Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe
• Prospects for 21cm-Galaxy Cross-Correlations with HERA and the Roman High-Latitude Survey
• The importance of stochasticity in determining galaxy emissivities and UV LFs during cosmic dawn and reionization
• The large-scale 21-cm power spectrum from reionization
• How informative are summaries of the cosmic 21-cm signal?
• The role of Pop III stars and early black holes in the 21cm signal from Cosmic Dawn
• 21cmFirstCLASS I. Cosmological tool for $\Lambda$CDM and beyond
• Exploring the cosmic dawn and epoch of reionization with 21cm line
• POLAR -- I: linking the 21-cm signal from the epoch of reionization to galaxy formation
• Measuring the cosmic expansion rate using 21-cm velocity acoustic oscillations
• Accurate modelling of the Lyman-$\alpha$ coupling for the 21-cm signal, observability with NenuFAR and SKA
• Forecasts and Statistical Insights for Line Intensity Mapping Cross-Correlations: A Case Study with 21cm x [CII]
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• Constraints on the state of the IGM at $z\sim 8-10$ using redshifted 21-cm observations with LOFAR
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• SKA-Low Intensity Mapping Pathfinder Updates: Deeper 21 cm Power Spectrum Limits from Improved Analysis Frameworks
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• Efficient simulation of discrete galaxy populations and associated radiation fields during the first billion years
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• Probing Dark Relativistic Species and Their Interactions with Dark Matter through CMB and 21cm surveys
• Joint 21-cm and CMB Forecasts for Constraining Self-Interacting Massive Neutrinos
• The mass distribution of the first stars can be determined via the 21-cm signal
• A Multi-messenger view of Cosmic Dawn: Conquering the Final Frontier
• Revisiting primordial magnetic fields through 21-cm physics: Bounds and forecasts
• A Differentiable, End-to-End Forward Model for 21 cm Cosmology: Estimating the Foreground, Instrument, and Signal Joint Posterior
• Rapid and Late Cosmic Reionization Driven by Massive Galaxies: a Joint Analysis of Constraints from 21-cm, Lyman Line & CMB Data Sets
• Search for the Epoch of Reionisation with HERA: Upper Limits on the Closure Phase Delay Power Spectrum
• Calibrating excursion set reionization models to approximately conserve ionizing photons
• Skew spectrum and smoothed skewness of 21-cm signals from epoch of reionization
• Probing isocurvature perturbations with 21-cm global signal in the light of HERA result
• Prospects of FRBs and Large Scale 21 cm Power Spectra in Constraining the Epoch of Reionization
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• Deep learning approach for identification of HII regions during reionization in 21-cm observations -- III. image recovery
• Statistical estimation of full-sky radio maps from 21cm array visibility data using Gaussian constrained realizations
• Impact of the primordial fluctuation power spectrum on the reionization history
• Impact of dark matter-baryon relative velocity on the 21cm forest
• Probing the Epoch of Reionization using synergies of line intensity mapping
• Boosting the 21 cm forest signals by the clumpy substructures
• Strategy for mitigation of systematics for EoR experiments with the Murchison Widefield Array
• Simulations of primary beam effects on the cosmic bispectrum phase observed with the Hydrogen Epoch of Reionization Array
• Comparison of Bayesian inference methods using the Loreli II database of hydro-radiative simulations of the 21-cm signal
• Prospects for measuring neutrino mass with 21-cm forest
• Expanded Generalized Needlet Internal Linear Combination (eGNILC) Framework for the 21-cm Foreground Removal
• The 21cm-galaxy cross-correlation: Realistic forecast for 21cm signal detection and reionisation constraints
• Reionizing islands with inhomogeneous recombinations
• Exploring One-point Statistics in HERA Phase I Data: Effects of Foregrounds and Systematics on Measuring One-Point Statistics
• oLIMpus: An Effective Model for Line Intensity Mapping Auto- and Cross- Power Spectra in Cosmic Dawn and Reionization
• From ANN to BNN: Inferring Reionization Parameters using Uncertainty-aware Emulators of 21-cm Summaries
• The signature of galaxy formation models in the power spectrum of the hydrogen 21cm line during reionization
• What can we learn about Reionization astrophysical parameters using Gaussian Process Regression?
• Astrophysical uncertainties challenge 21-cm forecasts: A primordial black hole case study
• Sensitivity toward dark matter annihilation imprints on 21-cm signal with SKA-Low: A convolutional neural network approach
• The Effect of Large Optical Depths on the Non-Gaussian 21-cm signal from Cosmic Dawn
• Mapping neutral islands during end stages of reionization with photometric intergalactic medium tomography
• 21 cm Cosmology Sensitivity to Small-Scale Structure: Warm vs Neutrino-Interacting Dark Matter
• The haloes that reionized the Universe
• Radiative transfer of 21-cm line through ionised cavities in an expanding universe
• On the accuracy of posterior recovery with neural network emulators
• Beyond the Power Spectrum: A New Framework for Non-Stationary Fields with Applications to Light-Cone Effects in Line Intensity Mapping
• A bubble size distribution model for the Epoch of Reionization
• Sample Variance Denoising in Cylindrical 21-cm Power Spectra
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