Radio discovery of Cosmic Dawn

Abstract

As First Light from the First Stars transforms the universe from Dark Ages into Cosmic Dawn, the thermal history may be traced in redshifted 21-cm from neutral hydrogen in the gas.  Efforts to build radiometers  to detect this faint signal are yielding results of significance to the theory, thus constraining the starlight of the earliest galaxies and their impact on the gas.  I will present the progression in astrophysical constraints that have resulted from radiometers deployed in remote sites in India – at the Timbaktu collective, in the trans-Himalayan plateau and floated on remote lakes.   Progress in precision has led to building of a GINAN radiometer in CSIRO, which has been trialed at the Inyarrimanha Ilgari Bundara, the Murchison Radio-astronomy Observatory in remote radio-quiet Western Australia, with an SKA-Low antenna element.

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