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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Foreground simulations for the LOFAR-epoch of reionization experiment
Monthly Notices of the Royal Astronomical Society, Volume 389, No. 3, Year 2008
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Description
Future high-redshift 21-cm experiments will suffer from a high degree of contamination, due both to astrophysical foregrounds and to non-astrophysical and instrumental effects. In order to reliably extract the cosmological signal from the observed data, it is essential to understand very well all data components and their influence on the extracted signal. Here we present simulated astrophysical foregrounds data cubes and discuss their possible statistical effects on the data. The foreground maps are produced assuming 5°× 5°windows that match those expected to be observed by the LOFAR epoch of reionization (EoR) key science project. We show that with the expected LOFAR-EoR sky and receiver noise levels, which amount to ≈52 mK at 150 MHz after 400 h of total observing time, a simple polynomial fit allows a statistical reconstruction of the signal. We also show that the polynomial fitting will work for maps with realistic yet idealized instrument response, i.e. a response that includes only a uniform uv coverage as a function of frequency and ignores many other uncertainties. Polarized Galactic synchrotron maps that include internal polarization and a number of Faraday screens along the line of sight are also simulated. The importance of these stems from the fact that the LOFAR instrument, in common with all current interferometric EoR experiments, has an instrumentally polarized response. © 2008 RAS.
Authors & Co-Authors
Jelić, Vibor
Netherlands, Groningen
Rijksuniversiteit Groningen
Zaroubi, Saleem
Netherlands, Groningen
Rijksuniversiteit Groningen
Labropoulos, Panagiotis
Netherlands, Groningen
Rijksuniversiteit Groningen
Thomas, Rajat Mani
Netherlands, Groningen
Rijksuniversiteit Groningen
Bernardi, Gianni
Netherlands, Groningen
Rijksuniversiteit Groningen
Brentjens, Michiel A.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
de Bruyn, A. Ger
Netherlands, Groningen
Rijksuniversiteit Groningen
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Ciardi, Benedetta
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Harker, Geraint J.A.
Netherlands, Groningen
Rijksuniversiteit Groningen
Koopmans, Léon V.E.
Netherlands, Groningen
Rijksuniversiteit Groningen
Pandey, Vishhambhar N.
Netherlands, Groningen
Rijksuniversiteit Groningen
Schaye, Joop
Netherlands, Leiden
Universiteit Leiden
Yatawatta, Sarod B.
Netherlands, Groningen
Rijksuniversiteit Groningen
Statistics
Citations: 217
Authors: 13
Affiliations: 4
Identifiers
Doi:
10.1111/j.1365-2966.2008.13634.x
ISSN:
00358711
Research Areas
Health System And Policy
Study Approach
Quantitative