Publication

Foreground simulations for the LOFAR-epoch of reionization experiment

Jelic, V., Zaroubi, S., Labropoulos, P., Thomas, R. M., Bernardi, G., Brentjens, M. A., de Bruyn, A. G., Ciardi, B., Harker, G., Koopmans, L. V. E., Pandey, V. N., Schaye, J. & Yatawatta, S., 21-Sep-2008, In : Monthly Notices of the Royal Astronomical Society. 389, 3, p. 1319-1335 17 p.

Research output: Contribution to journalArticleAcademicpeer-review

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 degrees x 5 degrees 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 approximate 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.

Original languageEnglish
Pages (from-to)1319-1335
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume389
Issue number3
Publication statusPublished - 21-Sep-2008

    Keywords

  • instrumentation : interferometers, cosmology : observation, cosmology : theory, diffuse radiation, radio continuum : general, radio lines : general, 21 CENTIMETER FLUCTUATIONS, PROBE WMAP OBSERVATIONS, GALAXY REDSHIFT SURVEY, INTERGALACTIC MEDIUM, SPIN TEMPERATURE, NEUTRAL HYDROGEN, RADIO-SOURCES, LINEAR-POLARIZATION, GALACTIC EMISSION, PRE-REIONIZATION

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