FIRST SEASON MWA EOR POWER SPECTRUM RESULTS at REDSHIFT 7

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

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

The Murchison Widefield Array (MWA) has collected hundreds of hours of Epoch of Reionization (EoR) data andnow faces the challenge of overcoming foreground and systematic contamination to reduce the data to acosmological 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 changeto the analysis pipeline is tested against a two-dimensional power spectrum figure of merit to demonstrateimprovement. We incorporate the new techniques into a deep integration of 32 hours of MWA data. This data set isused to place a systematic-limited upper limit on the cosmological power spectrum of Δ2 ≤ 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) overprevious MWA results. From this deep analysis, we have identified a list of improvements to be made to our EoRdata analysis strategies. These improvements will be implemented in the future and detailed in upcomingpublications.

Original languageEnglish (US)
Article number102
JournalAstrophysical Journal
Volume833
Issue number1
DOIs
StatePublished - Dec 10 2016

Keywords

  • cosmology: observations
  • cosmology: reionization

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Beardsley, A. P., Hazelton, B. J., Sullivan, I. S., Carroll, P., Barry, N., Rahimi, M., Pindor, B., Trott, C. M., Line, J., Jacobs, D., Morales, M. F., Pober, J. C., Bernardi, G., Bowman, J., Busch, M. P., Briggs, F., Cappallo, R. J., Corey, B. E., Oliveira-Costa, A. D., ... Wyithe, J. S. B. (2016). FIRST SEASON MWA EOR POWER SPECTRUM RESULTS at REDSHIFT 7. Astrophysical Journal, 833(1), [102]. https://doi.org/10.3847/1538-4357/833/1/102