The redshifted 21 cm line is an emerging tool in cosmology, in principle permitting three-
dimensional surveys of our universe that reach unprecedentedly large volumes, previously …

Several long-period radio transients have recently been discovered, with strongly polarized
coherent radio pulses appearing on timescales between tens to thousands of seconds,. In …

The Low Frequency Array (LOFAR) is an ideal instrument to conduct deep extragalactic
surveys. It has a large field of view and is sensitive to large-scale and compact emission. It …

ABSTRACT A new upper limit on the 21 cm signal power spectrum at a redshift of z≈ 9.1 is
presented, based on 141 h of data obtained with the Low-Frequency Array (LOFAR). The …

The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120–168 MHz imaging survey that will
eventually cover the entire northern sky. Each of the 3170 pointings will be observed for 8 h …

Abstract Using the Murchison Widefield Array (MWA), the low-frequency Square Kilometre
Array precursor located in Western Australia, we have completed the GaLactic and …

Astronomical wide-field imaging of interferometric radio data is computationally expensive,
especially for the large data volumes created by modern non-coplanar many-element …

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 …

LOFAR, the LOw-Frequency ARray, is a new-generation radio interferometer constructed in
the north of the Netherlands and across europe. Utilizing a novel phased-array design …

Diffuse cluster radio sources, in the form of radio halos and relics, reveal the presence of
cosmic rays and magnetic fields in the intracluster medium (ICM). These cosmic rays are …