Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasp..123.1265m&link_type=abstract
Publications of the Astronomical Society of the Pacific, Volume 123, issue 909, pp.1265-1272
Astronomy and Astrophysics
Astronomy
Astronomical Instrumentation
Scientific paper
Proposed 21 cm cosmology observatories for studying the epoch of reionization (z≈6-15) and dark energy (≈0-6) envision compact arrays with tens of thousands of antenna elements. Fully correlating this many elements is computationally expensive using traditional XF or FX correlators and has led some groups to reconsider direct imaging/FFT correlators. In this article we develop a variation of the direct imaging correlator that we call the MOFF correlator. The MOFF correlator shares the computational advantages of a direct imaging correlator, while avoiding a number of its shortcomings. In particular, the MOFF correlator makes no constraints on the antenna arrangement or type; provides a fully calibrated output image, including wide-field polarimetry and noncoplanar baseline effects; and can be orders of magnitude more efficient than XF or FX correlators for compact radio cosmology arrays.
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