20 citations · 83 across the 18 of their papers we have counts for
18 papers
Square Kilometer Array Synergies for the Epoch of Reionization and Cosmic Dawn
Anirban Chakraborty, Tirthankar R. Choudhury, Kanan K. Datta +15
Synergies with other instruments will be essential in making, verifying, and interpreting a detection of the cosmic 21-cm signal from the Epoch of Reionization (EoR) and Cosmic Daw…
Scalable Bayesian data curation for next-generation radio experiments
S. A. K. Leeney, E. de Lera Acedo, W. J. Handley +42
Next-generation radio telescopes produce data volumes that preclude manual quality assessment, yet data curation remains essential for science. We present a general, fully automati…
Impact of Stochastic Pop~III X-ray Binaries on the Cosmological 21-cm Signal
Saswata Dasgupta, Boyuan Liu, Anastasia Fialkov +3
High-mass X-ray binaries are one of the primary drivers of the 21-cm signal from Cosmic Dawn and Reionization, playing a leading role in the thermal history of the intergalactic me…
Optimisation of calibration sources for global 21-cm experiments: the REACH case
Adarsh Kumar Dash, Dominic Anstey, Harry T. J. Bevins +41
The spin-flip 21-cm signal from the Cosmic Dawn and the Epoch of Reionization is an essential probe of the conditions that led to the formation of the first luminous objects in the…
Circuit Modeling for In Situ 21 cm Radiometer Calibration
Gary Vincent Charles Allen, Saurabh Pegwal, Dirk de Villiers +42
Recent experiments in cosmology, particularly those aimed at detecting the faint, redshifted, global 21 cm hydrogen line (depth < ~200 mK, z > 7.5), have imposed stringent new requ…
First Results from HERA Phase II
The HERA Collaboration, Zuhra Abdurashidova, Tyrone Adams +83
We report the first upper limits on the power spectrum of 21-cm fluctuations during the Epoch of Reionization and Cosmic Dawn from Phase II of the Hydrogen Epoch of Reionization Ar…
Improved upper limits on the 21-cm signal power spectrum at and from an optimal field observed with NenuFAR
S. Munshi, F. G. Mertens, J. K. Chege +19
We report the deepest upper limits to date on the power spectrum of the 21-cm signal during the Cosmic Dawn (redshifts: ), using four nights of observations with NenuFAR. The…
Narrowing the discovery space of the cosmological 21-cm signal using multi-wavelength constraints
Jiten Dhandha, Anastasia Fialkov, Thomas Gessey-Jones +6
The cosmic 21-cm signal is a promising probe of the early Universe, owing to its sensitivity to the thermal state of the neutral intergalactic medium (IGM) and properties of the fi…
Ultraviolet photon production rates of the first stars: Impact on the He II 1640 Å emission line from primordial star clusters and the 21-cm signal from cosmic dawn
Joel Wasserman, Erik Zackrisson, Jiten Dhandha +3
The first stars, the chemically pristine Population III, likely played an important role in heating the intergalactic medium during the epoch of cosmic dawn. The very high effectiv…
Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
Boyuan Liu, Daniel Kessler, Thomas Gessey-Jones +6
The first generation of stars, known as Population III (Pop III), played a crucial role in the early Universe through their unique formation environment and metal-free composition.…
Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe
Jiten Dhandha, Anastasia Fialkov, Thomas Gessey-Jones +6
In the current era of JWST, we continue to uncover a wealth of information about the Universe deep into the Epoch of Reionization. In this work, we use a suite of simulations with…
Cosmological super-resolution of the 21-cm signal
Simon Pochinda, Jiten Dhandha, Anastasia Fialkov +1
In this study, we train score-based diffusion models to super-resolve gigaparsec-scale cosmological simulations of the 21-cm signal. We examine the impact of network and training d…
Uncovering the Effects of Array Mutual Coupling in 21-cm Experiments with the SKA-Low Radio Telescope
Oscar S. D. O'Hara, Quentin Gueuning, Eloy de Lera Acedo +8
We investigate the impact of Mutual Coupling (MC) between antennas on the time-delay power spectrum response of the core of the SKA-Low radio telescope. Using two in-house tools -…
Understanding spectral artefacts in SKA-LOW 21-cm cosmology experiments: the impact of cable reflections
Oscar Sage David O'Hara, Fred Dulwich, Eloy de Lera Acedo +4
The Cosmic Dawn was marked by the formation of the first stars, and preceded the Epoch of Reionization (EoR), when the Universe underwent a fundamental transformation caused by the…
Cosmic mysteries and the hydrogen 21-cm line: bridging the gap with lunar observations
Anastasia Fialkov, Thomas Gessey-Jones, Jiten Dhandha
The hydrogen 21-cm signal is predicted to be the richest probe of the young Universe including eras known as the cosmic Dark Ages, the Cosmic Dawn when the first star and black hol…
Decaying turbulence in molecular clouds: how does it affect filament networks and star formation?
Jiten Dhandha, Zoe Faes, Rowan J. Smith
The fragmentation of gas to form stars in molecular clouds is intrinsically linked to the turbulence within them. These internal motions are set at the birth of the cloud and may v…
Can accreting primordial black holes explain the excess radio background?
Sandeep Kumar Acharya, Jiten Dhandha, Jens Chluba
The excess radio background seen at has stimulated much scientific debate in the past years. Recently, it was pointed out that the soft photon emission f…
High-resolution imaging with the International LOFAR Telescope: Observations of the gravitational lenses MG 0751+2716 and CLASS B1600+434
Shruti Badole, Deepika Venkattu, Neal Jackson +7
We present Low-Frequency Array (LOFAR) telescope observations of the radio-loud gravitational lens systems MG 0751+2716 and CLASS B1600+434. These observations produce images at 30…