Ntsikelelo Charles | Probing the cosmic reionisation with the Hydrogen Epoch of Reionization Array скачать в хорошем качестве

Ntsikelelo Charles | Probing the cosmic reionisation with the Hydrogen Epoch of Reionization Array

The Epoch of Reionisation (EoR) is one of the least-known areas in cosmology from an observational point of view. The EoR is the period marked by the reionisation of the Inter-Galactic Medium (IGM) by radiation coming from the formation of the first stars and galaxies. Currently, several cosmological models are still predicting different reionisation scenarios and more sensitive data is required to discriminate between them. Precision antenna calibration is a requirement in 21 cm cosmological radio surveys. However, poorly understood diffuse galactic emission complicates the calibration process. Also, effects such as mutual coupling can further complicate the calibration process by introducing non-smooth calibration errors. In my talk, I will present an overview of 21 cm cosmology, primarily focusing on the Hydrogen Epoch of Reionization Array. I will discuss progress made in the field and a subset of the many challenges faced. I will also showcase my current research involving the use of closure phase quantities and fringe rate filters to improve the calibration of 21 cm observations.