307 citations · 5.5k across the 80 of their papers we have counts for
18 papers · 1 filter
Upper limits on the 21-cm Epoch of Reionization power spectrum from one night with LOFAR
A. H. Patil, S. Yatawatta, L. V. E. Koopmans +25
We present the first limits on the Epoch of Reionization (EoR) 21-cm HI power spectra, in the redshift range , using the Low-Frequency Array (LOFAR) High-Band Antenna (…
The Cosmic Dawn and Epoch of Reionization with the Square Kilometre Array
L. V. E. Koopmans, J. Pritchard, G. Mellema +42
Concerted effort is currently ongoing to open up the Epoch of Reionization (EoR) (15-6) for studies with IR and radio telescopes. Whereas IR detections have been made of sou…
Simulating the 21cm forest detectable with LOFAR and SKA in the spectra of high-z GRBs
B. Ciardi, S. Inoue, F. B. Abdalla +26
We investigate the feasibility of detecting 21cm absorption features in the afterglow spectra of high redshift long Gamma Ray Bursts (GRBs). This is done employing simulations of c…
Polarization leakage in Epoch of Reionization windows: I. LOFAR observations of the 3C196 field
K. M. B. Asad, L. V. E. Koopmans, V. Jelić +25
Detection of the 21-cm signal coming from the epoch of reionization (EoR) is challenging especially because, even after removing the foregrounds, the residual Stokes maps conta…
Constraining the epoch of reionization with the variance statistic: simulations of the LOFAR case
Ajinkya H. Patil, Saleem Zaroubi, Emma Chapman +27
Several experiments are underway to detect the cosmic redshifted 21-cm signal from neutral hydrogen from the Epoch of Reionization (EoR). Due to their very low signal-to-noise rati…
The spin temperature of high-redshift damped Lyman- systems
N. Kanekar, J. X. Prochaska, A. Smette +10
We report results from a programme aimed at investigating the temperature of neutral gas in high-redshift damped Lyman- absorbers (DLAs). This involved (1) HI 21cm absorption st…
The brightness and spatial distributions of terrestrial radio sources
A. R. Offringa, A. G. de Bruyn, S. Zaroubi +75
Faint undetected sources of radio-frequency interference (RFI) might become visible in long radio observations when they are consistently present over time. Thereby, they might obs…
Probing reionization with LOFAR using 21-cm redshift space distortions
Hannes Jensen, Kanan K. Datta, Garrelt Mellema +24
One of the most promising ways to study the epoch of reionization (EoR) is through radio observations of the redshifted 21-cm line emission from neutral hydrogen. These observation…
Prospects for detecting the 21cm forest from the diffuse intergalactic medium with LOFAR
B. Ciardi, P. Labropoulos, A. Maselli +20
We discuss the feasibility of the detection of the 21cm forest in the diffuse IGM with the radio telescope LOFAR. The optical depth to the 21cm line has been derived using simulati…
LOFAR insights into the epoch of reionization from the cross power spectrum of 21cm emission and galaxies
R. P. C. Wiersma, B. Ciardi, R. M. Thomas +18
Using a combination of N-body simulations, semi-analytic models and radiative transfer calculations, we have estimated the theoretical cross power spectrum between galaxies and the…
Imaging neutral hydrogen on large-scales during the Epoch of Reionization with LOFAR
S. Zaroubi, A. G. de Bruyn, G. Harker +17
The first generation of redshifted 21 cm detection experiments, carried out with arrays like LOFAR, MWA and GMRT, will have a very low signal-to-noise ratio per resolution element…
Foreground Removal using FastICA: A Showcase of LOFAR-EoR
Emma Chapman, Filipe B. Abdalla, Geraint Harker +6
We introduce a new implementation of the FastICA algorithm on simulated LOFAR EoR data with the aim of accurately removing the foregrounds and extracting the 21-cm reionization sig…
Early radio and X-ray observations of the youngest nearby type Ia supernova PTF11kly (SN 2011fe)
Assaf Horesh, S. R. Kulkarni, Derek B. Fox +20
On August 24 (UT) the Palomar Transient Factory (PTF) discovered PTF11kly (SN 2011fe), the youngest and most nearby type Ia supernova (SN Ia) in decades. We followed this event up…
Deep multi-frequency rotation measure tomography of the galaxy cluster A2255
R. F. Pizzo, A. G. de Bruyn, G. Bernardi +1
We aim to unveil their 3-dimensional geometry of Abell 2255 through WSRT observations at 18, 21, 25, 85, and 200 cm. The polarization images of the cluster were processed through r…
Power spectrum extraction for redshifted 21-cm epoch of reionization experiments: the LOFAR case
Geraint Harker, Saleem Zaroubi, Gianni Bernardi +13
One of the aims of the Low Frequency Array (LOFAR) Epoch of Reionization (EoR) project is to measure the power spectrum of variations in the intensity of redshifted 21-cm radiation…
Foregrounds for observations of the cosmological 21 cm line: II. Westerbork observations of the fields around 3C196 and the North Celestial Pole
G. Bernardi, A. G. de Bruyn, G. Harker +11
In the coming years a new insight into galaxy formation and the thermal history of the Universe is expected to come from the detection of the highly redshifted cosmological 21 cm l…
Radio spectral study of the cluster of galaxies Abell 2255
R. F. Pizzo, A. G. de Bruyn
Spectral index studies of halos, relics, and radio galaxies provide useful information on their origin and connection with merger processes. We present WSRT multi-wavelength observ…
Foregrounds for observations of the cosmological 21 cm line: I. First Westerbork measurements of Galactic emission at 150 MHz in a low latitude field
G. Bernardi, A. G. de Bruyn, M. A. Brentjens +11
We present the first results from a series of observations conducted with the Westerbork telescope in the 140--160 MHz range with a 2 arcmin resolution aimed at characterizing the…