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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6779
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dc.contributor.authorSingh, Saurabh-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.authorUdaya Shankar, N.-
dc.contributor.authorSathyanarayana Rao, Mayuri-
dc.contributor.authorFialkov, Anastasia-
dc.contributor.authorCohen, Aviad-
dc.contributor.authorGirish, B.S.-
dc.contributor.authorRaghunathan, A.-
dc.contributor.authorSomashekar, R.-
dc.contributor.authorSrivani, K.S.-
dc.date.accessioned2017-11-08T09:42:48Z-
dc.date.available2017-11-08T09:42:48Z-
dc.date.issued2017-08-20-
dc.identifier.citationAstrophysical Journal Letters , 2017, Vol.845, L12en_US
dc.identifier.issn1538-4357 (Online)-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/2289/6779-
dc.descriptionOpen Accessen_US
dc.description.abstractLong-wavelength spectral distortions in the cosmic microwave background arising from the 21 cm transition in neutral hydrogen are a key probe of the 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 the precision measurement of these monopole or all-sky global 21 cm spectral distortions. We use 63 hr nighttime observations 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 the class of models that feature weak X-ray heating (with ${f}_{X}\leqslant 0.1$) and rapid reionization (with peak $\tfrac{{{dT}}_{b}}{{dz}}\geqslant 120$ mK per unit redshift interval).en_US
dc.language.isoenen_US
dc.publisherIOP Sciences for The American Astronomical Societyen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2017ApJ...845L..12Sen_US
dc.relation.urihttp://arxiv.org/abs/1703.06647en_US
dc.relation.urihttp://dx.doi.org/10.3847/2041-8213/aa831ben_US
dc.rights2017, The American Astronomical Society.en_US
dc.subjectcosmic background radiationen_US
dc.subjectdark agesen_US
dc.subjectreionizationen_US
dc.subjectfirst starsen_US
dc.titleFirst Results on the Epoch of Reionization from First Light with SARAS 2en_US
dc.typeArticleen_US
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