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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8025
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dc.contributor.authorBevins, H.T.J.-
dc.contributor.authorFialkov, A.-
dc.contributor.authorde Lera Acedo, E.-
dc.contributor.authorHandley, W.J.-
dc.contributor.authorSingh, S.-
dc.contributor.authorSubrahmanyan, R.-
dc.contributor.authorBarkana, R.-
dc.date.accessioned2023-01-19T08:56:56Z-
dc.date.available2023-01-19T08:56:56Z-
dc.date.issued2022-11-28-
dc.identifier.citationNature Astronomy, 2022, Vol.6, p1473en_US
dc.identifier.issn2397-3366 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/8025-
dc.descriptionRestricted Accessen_US
dc.description.abstractObservations of the redshifted 21-cm line of atomic hydrogen have provided several upper limits on the 21-cm power spectrum and a tentative detection of the sky-averaged signal at redshift z ≈ 17. Made with the Experiment to Detect the Global EoR Signature (EDGES) low-band antenna, this claim was recently disputed by the SARAS 3 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 disfavour (at 68% confidence) radio-luminous galaxies in dark-matter haloes with masses of 4.4 × 105 M⊙ ≲ M ≲ 1.1 × 107 M⊙ (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 a radio luminosity per star formation rate of Lr/SFR ≳ 1.549 × 1025 W Hz−1 M⊙ −1 yr at 150 MHz, around 1,000 times brighter than today, and, separately, a synchrotron radio background in excess of the cosmic microwave background by ≳6% at 1.42 GHz.en_US
dc.language.isoenen_US
dc.publisherNature Publishing Groupen_US
dc.relation.urihttps://doi.org/10.1038/s41550-022-01825-6en_US
dc.rights2022 The Author(s)en_US
dc.titleAstrophysical constraints from the SARAS 3 non-detection of the cosmic dawn sky-averaged 21-cm signalen_US
dc.typeArticleen_US
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