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Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
H. T. J. Bevins, A. Fialkov, E. de Lera Acedo, W. J. Handley, S. Singh, R. Subrahmanyan, R. Barkana
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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∼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 ∼200 million years after the Big Bang (z≈20). We find, using Bayesian data analysis, that the data disfavours (at 68% confidence) radio-luminous galaxies in dark matter halos with masses of 4.4×10⁵ M_⊙ ≲M ≲1.1×10⁷M_⊙ (where M_⊙ 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 Lᵣ/SFR ≳1.549 ×10²⁵ W Hz⁻¹M_⊙⁻¹ yr at 150 MHz, a thousand times brighter than today, and, separately, a synchrotron radio background in excess of the CMB by ≳6% at 1.42 GHz.
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