Brute-Force Mapmaking with Compact Interferometers: A MITEoR Northern Sky Map from 128 MHz to 175 MHz
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Tegmark_Brute-force mapmaking.pdf
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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
Date Issued
March 2017
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1093/mnras/stw2910
