Raccanelli, Alvise, Zhao, Gong-Bo, Bacon, David J., Jarvis, Matt J., Percival, Will J., Norris, Ray P., Rottgering, Huub, Abdalla, Filipe B., Cress, Catherine M., Kubwimana, Jean-Claude, Lindsay, Sam, Nichol, Robert C., Santos, Mario G. and Schwarz, Dominik J. (2012), "Cosmological measurements with forthcoming radio continuum surveys", MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 424, 2: 801-819.
Abstract: We present forecasts for constraints on cosmological models that can be
obtained using the forthcoming radio continuum surveys: the wide surveys
with the Low Frequency Array (LOFAR) for radio astronomy, the Australian
Square Kilometre Array Pathfinder (ASKAP) and the Westerbork
Observations of the Deep Apertif Northern Sky (WODAN). We use simulated
catalogues that are appropriate to the planned surveys in order to
predict measurements obtained with the source autocorrelation, the
cross-correlation between radio sources and cosmic microwave background
(CMB) maps (the integrated SachsWolfe effect), the cross-correlation of
radio sources with foreground objects resulting from cosmic
magnification, and a joint analysis together with the CMB power spectrum
and supernovae (SNe). We show that near-future radio surveys will bring
complementary measurements to other experiments, probing different
cosmological volumes and having different systematics. Our results show
that the unprecedented sky coverage of these surveys combined should
provide the most significant measurement yet of the integrated
SachsWolfe effect. In addition, we show that the use of the integrated
SachsWolfe effect will significantly tighten the constraints on modified
gravity parameters, while the best measurements of dark energy models
will come from galaxy autocorrelation function analyses. Using a
combination of the Evolutionary Map of the Universe (EMU) and WODAN to
provide a full-sky survey, it will be possible to measure the dark
energy parameters with an uncertainty of s(w0) = 0.05, s(wa) = 0.12
and the modified gravity parameters s(?0) = 0.10, s(mu 0) = 0.05,
assuming Planck CMB+SN (current data) priors. Finally, we show that
radio surveys would detect a primordial non-Gaussianity of fNL= 8 at 1s,
and we briefly discuss other promising probes.
Keywords: cosmological parameters; cosmology: observations; large-scale structure
of Universe; radio continuum: galaxies
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