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LOFAR - low frequency array
In dit artikel zullen the authors LOFAR beschrijven: van de astronomische mogelijkheden met de nieuwe telescoop tot aan een nadere technische beshrijving of het instrument. Expand
Constraints on reionization from the thermal history of the intergalactic medium
The temperature of the diffuse, photoheated intergalactic medium (IGM) depends on its reionization history because the thermal timescales are long. The widths of the hydrogen Lyα absorption linesExpand
Temperature fluctuations in the intergalactic medium
ABSTRA C T The temperature of the low-density intergalactic medium (IGM) is set by the balance between adiabatic cooling resulting from the expansion of the Universe, and photoheating by theExpand
Foregrounds for observations of the cosmological 21 cm line - I. First Westerbork measurements of Galactic emission at 150 MHz in a low latitude field
Context. The cosmological 21 cm line promises to be a formidable tool for cosmology, allowing the investigation of the end of the so-called dark ages, when the first galaxies formed. Aims.Expand
Upper limits on the 21 cm Epoch of Reionization power spectrum from one night with LOFAR
We present the first limits on the Epoch of Reionization 21 cm H I power spectra, in the redshift range z = 7.9–10.6, using the Low-Frequency Array (LOFAR) High-Band Antenna (HBA). In total, 13.0 hrExpand
Large-Scale Power Spectrum from Peculiar Velocities via Likelihood Analysis
The power spectrum (PS) of mass density fluctuations, independent of "biasing," is estimated from the Mark III catalog of peculiar velocities using Bayesian statistics. A parametric model is assumedExpand
Foreground simulations for the LOFAR-epoch of reionization experiment
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 reliablyExpand
Wiener reconstruction of density, velocity and potential fields from all-sky galaxy redshift surveys
We present a new method for recovering the cosmological density, velocity, and potential fields from all-sky redshift catalogues. The method is based on an expansion of the fields in orthogonalExpand
Post‐correlation radio frequency interference classification methods
We describe and compare several post-correlation radio frequency interference (RFI) classification methods. As data sizes of observations grow with new and improved telescopes, the need forExpand
Reionization and the Cosmic Dawn with the Square Kilometre Array
The Square Kilometre Array (SKA) will have a low frequency component (SKA-low) which has as one of its main science goals the study of the redshifted 21 cm line from the earliest phases of star andExpand