Comparing Redundant and Sky-model-based Interferometric Calibration: A First Look with Phase II of the MWA
W Li, JC Pober, BJ Hazelton, N Barry, MF Morales, I Sullivan, AR Parsons, ZS Ali, JS Dillon, AP Beardsley, JD Bowman, F Briggs, R Byrne, P Carroll, B Crosse, D Emrich, A Ewall-Wice, L Feng, TMO Franzen, JN Hewitt Show all
The Astrophysical Journal | IOP PUBLISHING LTD | Published : 2018
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 ..View full abstract
Awarded by NSF
Awarded by NSF Astronomy and Astrophysics Postdoctoral Fellowship
W.L., J.C.P., B.J.H., N.B., M.F.M., and I.S. would like to acknowledge the support from NSF grant nos. 1613040, 1613855, and 1506024. J.S.D. acknowledges the support of NSF award no. 1701536. A.P.B. acknowledges the NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1701440. This scientific work makes use of the Murchison Radio-astronomy 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 (NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the Pawsey Supercomputing Centre, which is supported by the Western Australian and Australian Governments. This research was conducted using computation resources and services at the Center for Computation and Visualization, Brown University. We acknowledge Greg Rowbotham for providing the picture of MWA Phase II tiles.