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    Comparing Redundant and Sky-model-based Interferometric Calibration: A First Look with Phase II of the MWA

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    Access Status
    Open access
    Authors
    Li, W.
    Pober, J.
    Hazelton, B.
    Barry, N.
    Morales, M.
    Sullivan, I.
    Parsons, A.
    Ali, Z.
    Dillon, J.
    Beardsley, A.
    Bowman, J.
    Briggs, F.
    Byrne, R.
    Carroll, P.
    Crosse, B.
    Emrich, David
    Ewall-Wice, A.
    Feng, L.
    Franzen, Thomas
    Hewitt, J.
    Horsley, L.
    Jacobs, D.
    Johnston-Hollitt, M.
    Jordan, Christopher
    Joseph, R.
    Kaplan, D.
    Kenney, David
    Kim, H.
    Kittiwisit, P.
    Lanman, A.
    Line, J.
    McKinley, B.
    Mitchell, D.
    Murray, Steven
    Neben, A.
    Offringa, A.
    Pallot, D.
    Paul, S.
    Pindor, B.
    Procopio, P.
    Rahimi, M.
    Riding, J.
    Sethi, S.
    Udaya Shankar, N.
    Steele, K.
    Subrahmanian, R.
    Tegmark, M.
    Thyagarajan, N.
    Tingay, Steven
    Trott, Cathryn
    Walker, M.
    Wayth, Randall
    Webster, R.
    Williams, Andrew
    Wu, C.
    Wyithe, S.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Li, W. and Pober, J. and Hazelton, B. and Barry, N. and Morales, M. and Sullivan, I. and Parsons, A. et al. 2018. Comparing Redundant and Sky-model-based Interferometric Calibration: A First Look with Phase II of the MWA. Astrophysical Journal. 863 (2): Article ID 170.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/aad3c3
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Engineering)
    URI
    http://hdl.handle.net/20.500.11937/72500
    Collection
    • Curtin Research Publications
    Abstract

    © 2018. The American Astronomical Society. All rights reserved.. Interferometric arrays seeking to measure the 21 cm signal from the epoch of reionization (EOR) must contend with overwhelmingly bright emission from foreground sources. Accurate recovery of the 21 cm signal will require precise calibration of the array, and several new avenues for calibration have been pursued in recent years, including methods using redundancy in the antenna configuration. The newly upgraded Phase II of Murchison Widefield Array (MWA) is the first interferometer that has large numbers of redundant baselines while retaining good instantaneous UV coverage. This array therefore provides a unique opportunity to compare redundant calibration with sky-model-based algorithms. In this paper, we present the first results from comparing both calibration approaches with MWA Phase II observations. For redundant calibration, we use the package OMNICAL and produce sky-based calibration solutions with the analysis package Fast Holographic Deconvolution (FHD). There are three principal results: (1) We report the success of OMNICAL on observations of ORBComm satellites, showing substantial agreement between redundant visibility measurements after calibration. (2) We directly compare OMNICAL calibration solutions with those from FHD and demonstrate that these two different calibration schemes give extremely similar results. (3) We explore improved calibration by combining OMNICAL and FHD. We evaluate these combined methods using power spectrum techniques developed for EOR analysis and find evidence for marginal improvements mitigating artifacts in the power spectrum. These results are likely limited by the signal-to-noise ratio in the 6 hr of data used, but they suggest future directions for combining these two calibration schemes.

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