Realistic simulations of the Galactic polarized foreground: consequences for 21-cm reionization detection experiments

Vibor Jelic*, Saleem Zaroubi, Panagiotis Labropoulos, Gianni Bernardi, A. G. de Bruyn, Leon V. E. Koopmans

*Bijbehorende auteur voor dit werk

Onderzoeksoutput: ArticleAcademicpeer review

98 Citaten (Scopus)
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Samenvatting

Experiments designed to measure the redshifted 21-cm line from the epoch of reionization (EoR) are challenged by strong astrophysical foreground contamination, ionospheric distortions, complex instrumental response and other different types of noise (e.g. radio frequency interference). The astrophysical foregrounds are dominated by diffuse synchrotron emission from our Galaxy. Here we present a simulation of the Galactic emission used as a foreground module for the Low Frequency Array (LOFAR)-EoR key science project end-to-end simulations. The simulation produces total and polarized intensity over 10 degrees x 10 degrees maps of the Galactic synchrotron and free-free emission, including all observed characteristics of the emission: spatial fluctuations of amplitude and spectral index of the synchrotron emission, together with Faraday rotation effects. The importance of these simulations arises from the fact that the Galactic polarized emission could behave in a manner similar to the EoR signal along the frequency direction. As a consequence, an improper instrumental calibration will give rise to leakages of the polarized to the total signal and mask the desired EoR signal. In this paper, we address this for the first time through realistic simulations.

Originele taal-2English
Pagina's (van-tot)1647-1659
Aantal pagina's13
TijdschriftMonthly Notices of the Royal Astronomical Society
Volume409
Nummer van het tijdschrift4
DOI's
StatusPublished - 21-dec.-2010

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