Brute-Force Mapmaking with Compact Interferometers: A MITEoR Northern Sky Map from 128 MHz to 175 MHz
Author(s)
Liu, A.; Bradley, R. F.; Hickish, J.; Sanchez, N.; Zarb Adami, K.; Zheng, Haoxuan; Tegmark, Max Erik; Dillon, Joshua Shane; Neben, Abraham Richard; Tribiano, Shana; Buza, Victor; Ewall-Wice, Aaron Michael; Gharibyan, Hrant; Losh, Jonathan L; Kunz, Eben A; Lutomirski, Andrew Michael; Morgan, Edward H; Narayanan, Siddharth Madhavan; Perko, Ashley N; Rosner, Devon J.; Valdez, Melinda; Villasenor, Jesus Noel Samonte; Yang, Hong; Zelko, Ioana A.; Zheng, K.; Schutz, Katelin; ... Show more Show less
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We present a new method for interferometric imaging that is ideal for the large fields of view and compact arrays common in 21 cm cosmology. We first demonstrate the method with the simulations for two very different low-frequency interferometers, the Murchison Widefield Array and the MIT Epoch of Reionization (MITEoR) experiment. We then apply the method to the MITEoR data set collected in 2013 July to obtain the first northern sky map from 128 to 175 MHz at ∼2° resolution and find an overall spectral index of −2.73 ± 0.11. The success of this imaging method bodes well for upcoming compact redundant low-frequency arrays such as Hydrogen Epoch of Reionization Array. Both the MITEoR interferometric data and the 150 MHz sky map are available at http://space.mit.edu/home/tegmark/omniscope.html.
Date issued
2017-03Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space ResearchJournal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press
Citation
Zheng, H.; Tegmark, M.;Dillon, J. S.; Liu, A.; Neben; A. R.; Tribiano, S. M.; Bradley, R. F.; Buza, V. et al. "Brute-Force Mapmaking with Compact Interferometers: A MITEoR Northern Sky Map from 128 MHz to 175 MHz." Monthly Notices of the Royal Astronomical Society 465, no. 3 (March 2017) : 2901–2915 © 2016 The Authors
Version: Author's final manuscript
ISSN
0035-8711
1365-2966