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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8072
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dc.contributor.authorRao, Mayuri Sathyanarayana-
dc.contributor.authorShankar, N. Udaya-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.authorSingh, Saurabh-
dc.date.accessioned2023-04-03T09:19:10Z-
dc.date.available2023-04-03T09:19:10Z-
dc.date.issued2023-03-28-
dc.identifier.citationJournal of Astrophysics and Astronomy, 2023, Vol. 44, Article No. 24en_US
dc.identifier.issn0250-6335-
dc.identifier.issn0973-7758 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/8072-
dc.descriptionOpen Access from Indian Academy of Sciencesen_US
dc.description.abstractA key science project for SKA-Low is the interferometer imaging of spatio-temporal fluctuations in the hydrogen ionization fraction and spin temperature as a diagnostic of cosmic dawn (CD) and epoch of reionization (EoR) in the redshift range 6≲z≲28. However, detection of the global CD/EoR signal, which provides the differential HI 21-cm brightness temperature with respect to the background radiation temperature, is outside the current purview of SKA-Low observing in interferometer mode. This global CD/EoR signal can provide the critical zero-spacing measurement vital for establishing the base level of fluctuations measured by SKA-Low interferometers. We present here, a concept to detect the global CD/EoR signal as a supplement to the CD/EoR key science of SKA-Low. This would be enabled by adding a compact array of outrigger antennas interspersed between the core stations of SKA-Low. The autocorrelations of the outrigger antennas would form the measurement set for the global CD/EoR. The visibilities measured between outriggers and SKA stations would be ‘blind’ to the global CD/EoR signal and would provide a Global Sky Model and calibration of the bandpass and mode-coupling in the primary beam of the outriggers. The global signal measurement capability will strengthen the SKA-Low CD/EoR program.en_US
dc.language.isoenen_US
dc.publisherIndian Academy of Sciencesen_US
dc.relation.urihttps://doi.org/10.1007/s12036-023-09911-5en_US
dc.rights2023 Indian Academy of Sciences, Bengaluruen_US
dc.titleDetecting global signal from cosmic dawn and epoch of reionization with SKAen_US
dc.typeArticleen_US
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