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http://hdl.handle.net/20.500.12386/25132
Titolo: | Bayesian constraints on the global 21-cm signal from the Cosmic Dawn | Autori: | BERNARDI, GIANNI Zwart, J. T. L. Price, D. Greenhill, L. J. Mesinger, A. Dowell, J. Eftekhari, T. Ellingson, S. W. Kocz, J. Schinzel, F. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 461 | Fascicolo: | 3 | Da pagina:: | 2847 | Abstract: | The birth of the first luminous sources and the ensuing epoch of reionization are best studied via the redshifted 21-cm emission line, the signature of the first two imprinting the last. In this work, we present a fully Bayesian method, HIBAYES, for extracting the faint, global (sky-averaged) 21-cm signal from the much brighter foreground emission. We show that a simplified (but plausible) Gaussian model of the 21-cm emission from the Cosmic Dawn epoch (15 ≲ z ≲ 30), parametrized by an amplitude A_{H I}, a frequency peak ν _{H I} and a width σ _{H I}, can be extracted even in the presence of a structured foreground frequency spectrum (parametrized as a seventh-order polynomial), provided sufficient signal-to-noise (400 h of observation with a single dipole). We apply our method to an early, 19-min-long observation from the Large aperture Experiment to detect the Dark Ages, constraining the 21-cm signal amplitude and width to be -890 < A_{H I} < 0 mK and σ _{H I} > 6.5 MHz (corresponding to ∆z > 1.9 at redshift z ≃ 20) respectively at the 95-per cent confidence level in the range 13.2 < z < 27.4 (100 > ν > 50 MHz). | URI: | http://hdl.handle.net/20.500.12386/25132 | URL: | https://academic.oup.com/mnras/article/461/3/2847/2608619 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw1499 | Bibcode ADS: | 2016MNRAS.461.2847B | Fulltext: | open |
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