First Season MWA EoR Power spectrum Results at Redshift 7

Journal
Date Issued
2016
Author(s)
Beardsley, A. P.
•
Hazelton, B. J.
•
Sullivan, I. S.
•
Carroll, P.
•
Barry, N.
•
Rahimi, M.
•
Pindor, B.
•
Trott, C. M.
•
Line, J.
•
Jacobs, Daniel C.
•
Morales, M. F.
•
Pober, J. C.
•
•
Bowman, Judd D.
•
Busch, M. P.
•
Briggs, F.
•
Cappallo, R. J.
•
Corey, B. E.
•
de Oliveira-Costa, A.
•
Dillon, Joshua S.
•
Emrich, D.
•
Ewall-Wice, A.
•
Feng, L.
•
Gaensler, B. M.
•
Goeke, R.
•
Greenhill, L. J.
•
Hewitt, J. N.
•
Hurley-Walker, N.
•
Johnston-Hollitt, M.
•
Kaplan, D. L.
•
Kasper, J. C.
•
Kim, H. S.
•
Kratzenberg, E.
•
Lenc, E.
•
Loeb, A.
•
Lonsdale, C. J.
•
Lynch, M. J.
•
McKinley, B.
•
McWhirter, S. R.
•
Mitchell, D. A.
•
Morgan, E.
•
Neben, A. R.
•
Thyagarajan, Nithyanandan
•
Oberoi, D.
•
Offringa, A. R.
•
Ord, S. M.
•
Paul, S.
•
Prabu, T.
•
Procopio, P.
•
Riding, J.
•
Rogers, A. E. E.
•
Roshi, A.
•
Udaya Shankar, N.
•
Sethi, Shiv K.
•
Srivani, K. S.
•
Subrahmanyan, R.
•
Tegmark, M.
•
Tingay, S. J.
•
Waterson, M.
•
Wayth, R. B.
•
Webster, R. L.
•
Whitney, A. R.
•
Williams, A.
•
Williams, C. L.
•
Wu, C.
•
Wyithe, J. S. B.
DOI
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≤slant 2.7× {10}4 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.
Volume
833
Issue
1
Start page
102
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2016ApJ...833..102B
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

Beardsley2016.pdf

Description
Pdf editoriale
Size

4.5 MB

Format

Adobe PDF

Checksum (MD5)

37bd322d457da4cd4991f436ca0ccbfd