Probing early Universe through redshifted 21-cm signal: Modeling and observational challenges
Cosmic dawn (CD) and the epoch of reionization (EoR) are the most important parts of
cosmic history during which the first luminous structures emerged. These first objects heated …
cosmic history during which the first luminous structures emerged. These first objects heated …
First upper limits on the 21 cm signal power spectrum from cosmic dawn from one night of observations with NenuFAR
The redshifted 21 cm signal from neutral hydrogen is a direct probe of the physics of the
early universe and has been an important science driver of many present and upcoming …
early universe and has been an important science driver of many present and upcoming …
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 …
Diffuse sources, clustering, and the excess anisotropy of the radio synchrotron background
We present the largest low frequency (120 MHz) arcminute resolution image of the radio
synchrotron background (RSB) to date, and its corresponding angular power spectrum of …
synchrotron background (RSB) to date, and its corresponding angular power spectrum of …
Validation of the HERA Phase I epoch of reionization 21 cm power spectrum software pipeline
We describe the validation of the HERA Phase I software pipeline by a series of modular
tests, building up to an end-to-end simulation. The philosophy of this approach is to validate …
tests, building up to an end-to-end simulation. The philosophy of this approach is to validate …
Assessing the impact of two independent direction-dependent calibration algorithms on the LOFAR 21 cm signal power spectrum-And applications to an observation …
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 …
Ionospheric contributions to the excess power in high-redshift 21-cm power-spectrum observations with LOFAR
The turbulent ionosphere causes phase shifts to incoming radio waves on a broad range of
temporal and spatial scales. When an interferometer is not sufficiently calibrated for the …
temporal and spatial scales. When an interferometer is not sufficiently calibrated for the …
Spectral redundancy for calibrating interferometers and suppressing the foreground wedge in 21 cm cosmology
Observations of 21 cm line from neutral hydrogen promise to be an exciting new probe of
astrophysics and cosmology during the Cosmic Dawn and through the Epoch of …
astrophysics and cosmology during the Cosmic Dawn and through the Epoch of …
Redshifted 21-cm bispectrum: impact of the source models on the signal and the IGM physics from the Cosmic Dawn
The emissions from the first luminous sources drive the fluctuations in the 21-cm signal at
Cosmic Dawn (CD) via two main astrophysical processes, namely Lyα coupling and X-ray …
Cosmic Dawn (CD) via two main astrophysical processes, namely Lyα coupling and X-ray …
Evidence of Ultrafaint Radio Frequency Interference in Deep 21 cm Epoch of Reionization Power Spectra with the Murchison Wide-field Array
MJ Wilensky, MF Morales, BJ Hazelton… - The Astrophysical …, 2023 - iopscience.iop.org
We present deep upper limits from the 2014 Murchison Widefield Array Phase I observing
season, with a particular emphasis on identifying the spectral fingerprints of extremely faint …
season, with a particular emphasis on identifying the spectral fingerprints of extremely faint …