Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal

Abstract

Observations of the redshifted 21-cm line of atomic hydrogen have resulted in several upper limits on the 21-cm power spectrum and a tentative detection of the sky-averaged signal at $z\sim 17$. Made with the EDGES Low-Band antenna, this claim was recently disputed by the SARAS3 experiment, which reported a non-detection and is the only available upper limit strong enough to constrain cosmic dawn astrophysics. We use these data to constrain a population of radio-luminous galaxies $\sim 200$ million years after the Big Bang ($z\approx 20$). We find, using Bayesian data analysis, that the data disfavours (at 68% confidence) radio-luminous galaxies in dark matter halos with masses of $4.4\times 10^5$ M${}_{\odot }\lesssim M\lesssim 1.1\times 10^7$M${}_{\odot }$ (where $M_{\odot }$ is the mass of the Sun) at $z=20$ and galaxies in which $>5$% of the gas is converted into stars. The data disfavour galaxies with radio luminosity per star formation rate of $L_{\mathrm{r}}/\mathrm{SFR}\gtrsim 1.549\times 10^{25}$ W Hz${}^{-1}$M${}_{\odot }^{-1}$ yr at 150 MHz, a thousand times brighter than today, and, separately, a synchrotron radio background in excess of the CMB by $\gtrsim 6$ at 1.42 GHz.

Published in Nature Astronomy

References in corpus (25)

• PolyChord: nested sampling for cosmology
• Deep multi-redshift limits on Epoch of Reionisation 21cm Power Spectra from Four Seasons of Murchison Widefield Array Observations
• Signature of Excess Radio Background in the 21-cm Global Signal and Power Spectrum
• HERA Phase I Limits on the Cosmic 21-cm Signal: Constraints on Astrophysics and Cosmology During the Epoch of Reionization
• Testing for calibration systematics in the EDGES low-band data using Bayesian model selection
• The REACH radiometer for detecting the 21-cm hydrogen signal from redshift 7.5 to 28
• anesthetic: nested sampling visualisation
• The influence of streaming velocities and Lyman-Werner radiation on the formation of the first stars
• IGM damping wing constraints on reionisation from covariance reconstruction of two $z\gtrsim 7$ QSOs
• High-redshift radio galaxies: a potential new source of 21-cm fluctuations
• The Evolution of the Lyman-Alpha Luminosity Function During Reionization
• The subtlety of Ly-a photons: changing the expected range of the 21-cm signal
• The rich complexity of 21-cm fluctuations produced by the first stars
• A General Bayesian Framework for Foreground Modelling and Chromaticity Correction for Global 21cm Experiments
• Results from EDGES High-Band: III. New Constraints on Parameters of the Early Universe
• 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
• SARAS 3 CD/EoR Radiometer: Design and Performance of the Receiver
• GLOBALEMU: A novel and robust approach for emulating the sky-averaged 21-cm signal from the cosmic dawn and epoch of reionisation
• Radio background and IGM heating due to Pop III supernovae explosions
• The AARTFAAC Cosmic Explorer: observations of the 21-cm power spectrum in the EDGES absorption trough
• SARAS CD/EoR Radiometer: Design and performance of the Digital Correlation Spectrometer
• A Floating Octave Bandwidth Cone-Disc Antenna for Detection of Cosmic Dawn
• Marginal Bayesian Statistics Using Masked Autoregressive Flows and Kernel Density Estimators with Examples in Cosmology
• Marginal Post Processing of Bayesian Inference Products with Normalizing Flows and Kernel Density Estimators

Cited by in corpus (31)

• Aspects of the Dark Dimension in Cosmology
• A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- I. Mathematical formalism
• Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe
• POLAR -- I: linking the 21-cm signal from the epoch of reionization to galaxy formation
• Searching for blue in the dark
• RHINO: A large horn antenna for detecting the 21cm global signal
• The EDGES measurement disfavors an excess radio background during the cosmic dawn
• Relic neutrino decay solution to the excess radio background
• Deciphering Faint Gyrosynchrotron Emission from Coronal Mass Ejection using Spectro-polarimetric Radio Imaging
• The mass distribution of the first stars can be determined via the 21-cm signal
• Resistive Heating Induced by Streaming Cosmic Rays Around a Galaxy in the Early Universe
• Rapid and Late Cosmic Reionization Driven by Massive Galaxies: a Joint Analysis of Constraints from 21-cm, Lyman Line & CMB Data Sets
• Skew spectrum and smoothed skewness of 21-cm signals from epoch of reionization
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• Probing the global 21-cm background by velocity-induced dipole and quadrupole anisotropies
• A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- II. Model priors and posterior odds
• Prospects for probing dark matter particles and primordial black holes with the Hongmeng mission using the 21 cm global spectrum at cosmic dawn
• Accounting for Noise and Singularities in Bayesian Calibration Methods for Global 21-cm Cosmology Experiments
• Reionizing islands with inhomogeneous recombinations
• Narrowing the discovery space of the cosmological 21-cm signal using multi-wavelength constraints
• In Search of Global 21-cm Signal using Artificial Neural Network in light of ARCADE 2
• Confronting global 21-cm signal with ${\mathbb{Z}}_3$ symmetric dark matter models
• The signature of galaxy formation models in the power spectrum of the hydrogen 21cm line during reionization
• Capturing System Drift with Time Series Calibration for Global 21-cm Cosmology Experiments
• The magnitude of the dark ages 21-cm signal in the context of existing early and late time constraints on $\Lambda$CDM
• Absorption in the 21 cm Hydrogen Line at $z>10$ as a Sensitive Tool for the Construction of a Cosmological Model on Small Scales
• Overview of the ESCAPE Dark Matter Test Science Project for Astronomers
• Classification of Radio Backgrounds at Cosmic Dawn and 21 cm Signal Confirmation Using Neural Networks
• POLAR-II: modeling star formation history of galaxies on the 21-cm signal from Epoch of Reionization
• On the accuracy of posterior recovery with neural network emulators
• Foreground Subtraction with a Tensor-Based Oriented Singular Value Decomposition Method for HI Experiments