DELAY SPECTRUM with PHASE-TRACKING ARRAYS: EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION

S Paul; SK Sethi; MF Morales; KS Dwarkanath; NU Shankar; R Subrahmanyan; N Barry; AP Beardsley; JD Bowman; F Briggs; P Carroll; A De Oliveira-Costa; JS Dillon; A Ewall-Wice; L Feng; LJ Greenhill; BM Gaensler; BJ Hazelton; JN Hewitt; N Hurley-Walker; DJ Jacobs; HS Kim; P Kittiwisit; E Lenc; J Line; A Loeb; B McKinley; DA Mitchell; AR Neben; AR Offringa; B Pindor; JC Pober; P Procopio; J Riding; IS Sullivan; M Tegmark; N Thyagarajan; SJ Tingay; CM Trott; RB Wayth; RL Webster; JSB Wyithe; R Cappallo; M Johnston-Hollitt; DL Kaplan; CJ Lonsdale; SR McWhirter; E Morgan; D Oberoi; SM Ord; T Prabu; KS Srivani; A Williams; CL Williams

Journal article

DELAY SPECTRUM with PHASE-TRACKING ARRAYS: EXTRACTING the H i POWER SPECTRUM from the EPOCH of REIONIZATION

S Paul, SK Sethi, MF Morales, KS Dwarkanath, NU Shankar, R Subrahmanyan, N Barry, AP Beardsley, JD Bowman, F Briggs, P Carroll, A De Oliveira-Costa, JS Dillon, A Ewall-Wice, L Feng, LJ Greenhill, BM Gaensler, BJ Hazelton, JN Hewitt, N Hurley-Walker Show all

Astrophysical Journal | IOP Publishing Ltd | Published : 2016

DOI: 10.3847/1538-4357/833/2/213

Abstract

The detection of redshifted 21 cm emission from the epoch of reionization (EoR) is a challenging task owing to strong foregrounds that dominate the signal. In this paper, we propose a general method, based on the delay spectrum approach, to extract H i power spectra that are applicable to tracking observations using an imaging radio interferometer (»Delay Spectrum with Imaging Arrays»). Our method is based on modeling the H i signal taking into account the impact of wide field effects such as the w-term, which are then used as appropriate weights in cross-correlating the measured visibilities. Our method is applicable to any radio interferometer that tracks a phase center and could be utiliz..

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University of Melbourne Researchers

Nichole Barry Author

Pietro Procopio Author

Rachel Webster Author

Stuart Wyithe Author

Grants

Funding Acknowledgements

This scientific work makes use of the Murchison Radioastronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the operation of the MWA is provided by the Australian Government Department of Industry and Science and Department of Education (National Collaborative Research Infrastructure Strategy: NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the iVEC Petabyte Data Store and the Initiative in Innovative Computing and the CUDA Center for Excellence sponsored by NVIDIA at Harvard University.