article · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2009
Fast Fourier transform telescope
Max Tegmark, Matías Zaldarriaga
Cited by 143Open access
Abstract
We propose an all-digital telescope for 21 cm tomography, which combines key advantages of both single dishes and interferometers. The electric field is digitized by antennas on a rectangular grid, after which a series of fast Fourier transforms recovers simultaneous multifrequency images of up to half the sky. Thanks to Moore's law, the bandwidth up to which this is feasible has now reached about 1 GHz, and will likely continue doubling every couple of years. The main advantages over a single dish telescope are cost and orders of magnitude larger field-of-view, translating into dramatically better sensitivity for large-area surveys. The key advantages over traditional interferometers are cost (the correlator computational cost for an $N$-element array scales as $N{log}_{2}N$ rather than ${N}^{2}$) and a compact synthesized beam. We argue that 21 cm tomography could be an ideal first application of a very large fast Fourier transform telescope, which would provide both massive sensitivity improvements per dollar and mitigate the off-beam point source foreground problem with its clean beam. Another potentially interesting application is cosmic microwave background polarization.
Cite this paper
Tegmark, M., & Zaldarriaga, M. (2009). Fast Fourier transform telescope. Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology, 79(8). https://doi.org/10.1103/physrevd.79.083530
Tegmark, Max, and Matías Zaldarriaga. “Fast Fourier transform telescope.” Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology, vol. 79, no. 8, 2009, https://doi.org/10.1103/physrevd.79.083530.
Tegmark, Max, and Matías Zaldarriaga. 2009. “Fast Fourier transform telescope.” Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 79 (8). https://doi.org/10.1103/physrevd.79.083530.
Tegmark, M. and Zaldarriaga, M. (2009) ‘Fast Fourier transform telescope’, Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology, 79(8). Available at: https://doi.org/10.1103/physrevd.79.083530.
@article{tegmark2009fast,
title = {{Fast Fourier transform telescope}},
author = {Tegmark, Max and Zaldarriaga, Matías},
journal = {Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology},
volume = {79},
number = {8},
year = {2009},
doi = {10.1103/physrevd.79.083530}
}Made from the index record. Check names, capitalisation and page numbers against the paper. Need another style? AI for Research has over 10,000.