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Status of Foreground and Instrument Challenges for 21cm EoR experiments – Design Strategies for SKA and HERA

Published online by Cambridge University Press:  08 May 2018

Nithyanandan Thyagarajan Open the ORCID record for Nithyanandan Thyagarajan [Opens in a new window]
Nithyanandan Thyagarajan*
Affiliation:
National Radio Astronomy Observatory, 1003 Lopezville Rd, Socorro, NM 87801, USA email: t_nithyanandan@nrao.edu
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Abstract

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Direct detection of the Epoch of Reionization (EoR) via redshifted 21 cm line of H i will reveal the nature of the first stars and galaxies as well as revolutionize our understanding of a poorly explored evolutionary phase of the Universe. Projects such as the MWA, LOFAR, and PAPER commenced in the last decade with the promise of high significance statistical detection of the EoR, but have so far only weakly constrained models owing to unforeseen challenges from bright foreground sources and instrument systematics. It is essential for next generation instruments like the HERA and SKA to have these challenges addressed. I present an analysis of these challenges – wide-field measurements, antenna beam chromaticity, reflections in the instrument, and antenna position errors – along with performance specifications and design solutions that will be critical to designing successful next-generation instruments in enabling the first detection and also in placing meaningful constraints on reionization models.

Keywords

cosmology: observationsdark agesreionizationfirst starsinstrumentation: interferometerstechniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 102 - 105
Copyright
Copyright © International Astronomical Union 2018 

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