Scalable splitting algorithms for big-data interferometric imaging in the SKA era
In the context of next-generation radio telescopes, like the Square Kilometre Array (SKA), the
efficient processing of large-scale data sets is extremely important. Convex optimization …
efficient processing of large-scale data sets is extremely important. Convex optimization …
The AARTFAAC Cosmic Explorer: observations of the 21-cm power spectrum in the EDGES absorption trough
The 21-cm absorption feature reported by the EDGES collaboration is several times stronger
than that predicted by traditional astrophysical models. If genuine, a deeper absorption may …
than that predicted by traditional astrophysical models. If genuine, a deeper absorption may …
Redundant-baseline calibration of the hydrogen epoch of reionization array
In 21-cm cosmology, precision calibration is key to the separation of the neutral hydrogen
signal from very bright but spectrally smooth astrophysical foregrounds. The Hydrogen …
signal from very bright but spectrally smooth astrophysical foregrounds. The Hydrogen …
On the use of temporal filtering for mitigating galactic synchrotron calibration bias in 21 cm reionization observations
Precision antenna calibration is required for mitigating the impact of foreground
contamination in 21 cm cosmological radio surveys. One widely studied source of error is …
contamination in 21 cm cosmological radio surveys. One widely studied source of error is …
A numerical study of 21-cm signal suppression and noise increase in direction-dependent calibration of LOFAR data
We investigate systematic effects in direction-dependent gain calibration in the context of the
Low-Frequency Array (LOFAR) 21-cm Epoch of Reionization (EoR) experiment. The LOFAR …
Low-Frequency Array (LOFAR) 21-cm Epoch of Reionization (EoR) experiment. The LOFAR …
Science with the Murchison Widefield Array: Phase i results and Phase II opportunities
The Murchison Widefield Array (MWA) is an open access telescope dedicated to studying
the low-frequency (80–300 MHz) southern sky. Since beginning operations in mid-2013, the …
the low-frequency (80–300 MHz) southern sky. Since beginning operations in mid-2013, the …
The Impact of Beam Variations on Power Spectrum Estimation for 21 cm Cosmology. II. Mitigation of Foreground Systematics for HERA
H Kim, NS Kern, JN Hewitt, BD Nhan… - The Astrophysical …, 2023 - iopscience.iop.org
One key challenge in detecting a 21 cm cosmological signal at z> 6 is to separate the
cosmological signal from foreground emission. This can be studied in a power spectrum …
cosmological signal from foreground emission. This can be studied in a power spectrum …
[HTML][HTML] Assessing the impact of two independent direction-dependent calibration algorithms on the LOFAR 21 cm signal power spectrum-And applications to an …
Context. Detecting the 21 cm signal from the epoch of reionisation (EoR) has been highly
challenging due to the strong astrophysical foregrounds, ionospheric effects, radio …
challenging due to the strong astrophysical foregrounds, ionospheric effects, radio …
Quantifying suppression of the cosmological 21-cm signal due to direction-dependent gain calibration in radio interferometers
A Mouri Sardarabadi… - Monthly Notices of the …, 2019 - academic.oup.com
The 21-cm signal of neutral hydrogen promises to be an important source of information for
the study of the cosmic dawn and epoch of reionization. However, its detection is difficult …
the study of the cosmic dawn and epoch of reionization. However, its detection is difficult …
Wide-field LOFAR-LBA power-spectra analyses: impact of calibration, polarization leakage, and ionosphere
BK Gehlot, LVE Koopmans, AG de Bruyn… - Monthly Notices of …, 2018 - academic.oup.com
Contamination due to foregrounds (Galactic and extragalactic), calibration errors, and
ionospheric effects poses major challenges in the detection of the cosmic 21 cm signal in …
ionospheric effects poses major challenges in the detection of the cosmic 21 cm signal in …