First season MWA EoR power spectrum results at redshift 7

Beardsley, A.; Hazelton, B.; Sullivan, I.; Carroll, P.; Barry, N.; Rahimi, M.; Pindor, B.; Trott, Cathryn; Line, J.; Jacobs, D.; Morales, M.; Pober, J.; Bernardi, G.; Bowman, J.; Busch, M.; Briggs, F.; Cappallo, R.; Corey, B.; Oliveira-Costa, A.; Dillon, J.; Emrich, David; Ewall-Wice, A.; Feng, L.; Gaensler, B.; Goeke, R.; Greenhill, L.; Hewitt, J.; Hurley-Walker, Natasha; Johnston-Hollitt, M.; Kaplan, D.; Kasper, J.; Kim, H.; Kratzenberg, E.; Lenc, E.; Loeb, A.; Lonsdale, C.; Lynch, Mervyn; McKinley, B.; McWhirter, S.; Mitchell, D.; Morgan, E.; Neben, A.; Thyagarajan, N.; Oberoi, D.; Offringa, A.; Ord, S.; Paul, S.; Prabu, T.; Procopio, P.; Riding, J.; Rogers, A.; Roshi, A.; Shankar, N.; Sethi, S.; Srivani, K.; Subrahmanyan, R.; Tegmark, M.; Tingay, Steven; Waterson, M.; Wayth, Randall; Webster, R.; Whitney, A.; Williams, Andrew; Williams, C.; Wu, C.; Wyithe, J.

doi:10.3847/1538-4357/833/1/102

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Access Status

Open access

Authors

Beardsley, A.

Hazelton, B.

Sullivan, I.

Carroll, P.

Barry, N.

Rahimi, M.

Pindor, B.

Trott, Cathryn

Line, J.

Jacobs, D.

Morales, M.

Pober, J.

Bernardi, G.

Bowman, J.

Busch, M.

Briggs, F.

Cappallo, R.

Corey, B.

Oliveira-Costa, A.

Dillon, J.

Emrich, David

Ewall-Wice, A.

Feng, L.

Gaensler, B.

Goeke, R.

Greenhill, L.

Hewitt, J.

Hurley-Walker, Natasha

Johnston-Hollitt, M.

Kaplan, D.

Kasper, J.

Kim, H.

Kratzenberg, E.

Lenc, E.

Loeb, A.

Lonsdale, C.

Lynch, Mervyn

McKinley, B.

McWhirter, S.

Mitchell, D.

Morgan, E.

Neben, A.

Thyagarajan, N.

Oberoi, D.

Offringa, A.

Ord, S.

Paul, S.

Prabu, T.

Procopio, P.

Riding, J.

Rogers, A.

Roshi, A.

Shankar, N.

Sethi, S.

Srivani, K.

Subrahmanyan, R.

Tegmark, M.

Tingay, Steven

Waterson, M.

Wayth, Randall

Webster, R.

Whitney, A.

Williams, Andrew

Williams, C.

Wu, C.

Wyithe, J.

Date

2016

Type

Journal Article

Metadata

Show full item record

Citation

Beardsley, A. and Hazelton, B. and Sullivan, I. and Carroll, P. and Barry, N. and Rahimi, M. and Pindor, B. et al. 2016. First season MWA EOR power spectrum results at redshift 7. Astrophysical Journal. 833 (1): Article 102.

Source Title

Astrophysical Journal

DOI

10.3847/1538-4357/833/1/102

ISSN

0004-637X

School

Department of Electrical and Computer Engineering

Remarks

This is an author-created, un-copy edited version of an article accepted for publication in Astrophysical Journal. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://doi.org/10.3847/1538-4357/833/1/102

URI

http://hdl.handle.net/20.500.11937/21766

Collection

Curtin Research Publications

Abstract

The Murchison Widefield Array (MWA) has collected hundreds of hours of Epoch of Reionization (EoR) data and now faces the challenge of overcoming foreground and systematic contamination to reduce the data to a cosmological measurement. We introduce several novel analysis techniques, such as cable reflection calibration, hyper-resolution gridding kernels, diffuse foreground model subtraction, and quality control methods. Each change to the analysis pipeline is tested against a two-dimensional power spectrum figure of merit to demonstrate improvement. We incorporate the new techniques into a deep integration of 32 hours of MWA data. This data set is used to place a systematic-limited upper limit on the cosmological power spectrum of ∆2 ≤ 2.7×104 mK2 at k =0.27 h Mpc-1 and z = 7.1, consistent with other published limits, and a modest improvement (factor of 1.4) over previous MWA results. From this deep analysis, we have identified a list of improvements to be made to our EoR data analysis strategies. These improvements will be implemented in the future and detailed in upcoming publications.