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18 April 2024

» arxiv » 1703.6647

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First results on the Epoch of Reionization from First Light with SARAS 2
Saurabh Singh ; Ravi Subrahmanyan ; N. Udaya Shankar ; Mayuri Sathyanarayana Rao ; Anastasia Fialkov ; Aviad Cohen ; Rennan Barkana ; B.S. Girish ; A. Raghunathan ; R. Somashekar ; K.S. Srivani ;
Date:	20 Mar 2017
Abstract:	Long wavelength spectral distortions in the Cosmic Microwave Background arising from the 21-cm transition in neutral Hydrogen are a key probe of Cosmic Dawn and the Epoch of Reionization. These features may reveal the nature of the first stars and ultra-faint galaxies that transformed the spin temperature and ionization state of the primordial gas. SARAS 2 is a spectral radiometer purposely designed for precision measurement of these monopole or all-sky global 21-cm spectral distortions. We use a 4-hr observation of the radio background in the frequency band 110-200 MHz with the radiometer deployed at the Timbaktu Collective in Southern India to derive likelihoods for plausible redshifted 21-cm signals predicted by theoretical models. First light with SARAS 2 disfavors models that feature weak X-ray heating along with rapid reionization.
Source:	arXiv, 1703.6647
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