Studying cosmic dawn using redshifted HI 21-cm signal: A brief review

A Bera, R Ghara, A Chatterjee, KK Datta… - Journal of Astrophysics …, 2023 - Springer
In this review article, we briefly outline our current understanding of the physics associated
with the HI 21-cm signal from cosmic dawn. We discuss different phases of cosmic dawn as …

Probing early Universe through redshifted 21-cm signal: Modeling and observational challenges

AK Shaw, A Chakraborty, M Kamran, R Ghara… - Journal of Astrophysics …, 2023 - Springer
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 …

Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations

R Ghara, SK Giri, G Mellema, B Ciardi… - Monthly Notices of …, 2020 - academic.oup.com
We derive constraints on the thermal and ionization states of the intergalactic medium (IGM)
at redshift≈ 9.1 using new upper limits on the 21-cm power spectrum measured by the …

beorn: a fast and flexible framework to simulate the epoch of reionization and cosmic dawn

T Schaeffer, SK Giri, A Schneider - Monthly Notices of the Royal …, 2023 - academic.oup.com
In this study, we introduce beorn (Bubbles during the Epoch of Reionization Numerical
Simulator), a publicly available python code that generates three-dimensional maps of the …

Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations

R Ghara, SK Giri, B Ciardi, G Mellema… - Monthly Notices of the …, 2021 - academic.oup.com
ABSTRACT The Murchison Widefield Array (MWA) team has derived new upper limits on the
spherically averaged power spectrum of the 21-cm signal at six redshifts in the range z≈ 6.5 …

Exploring the cosmic 21-cm signal from the epoch of reionization using the wavelet scattering transform

B Greig, YS Ting, AA Kaurov - Monthly Notices of the Royal …, 2022 - academic.oup.com
Detecting the cosmic 21-cm signal during the Epoch of Reionization and Cosmic Dawn will
reveal insights into the properties of the first galaxies and advance cosmological parameter …

Machine learning astrophysics from 21 cm lightcones: impact of network architectures and signal contamination

D Prelogović, A Mesinger, S Murray… - Monthly Notices of …, 2022 - academic.oup.com
Imaging the cosmic 21 cm signal will map out the first billion years of our Universe. The
resulting 3D lightcone (LC) will encode the properties of the unseen first galaxies and …

The morphology of reionization in a dynamically clumpy universe

C Cain, A D'Aloisio, N Gangolli… - Monthly Notices of the …, 2023 - academic.oup.com
ABSTRACT A recent measurement of the Lyman-limit mean free path at z= 6 suggests it may
have been very short, motivating a better understanding of the role that ionizing photon sinks …

Deep learning approach for identification of H ii regions during reionization in 21-cm observations – II. Foreground contamination

M Bianco, SK Giri, D Prelogović, T Chen… - Monthly Notices of …, 2024 - academic.oup.com
ABSTRACT The upcoming Square Kilometre Array Observatory will produce images of
neutral hydrogen distribution during the epoch of reionization by observing the …

Cosmological forecast of the 21-cm power spectrum with the halo model of reionization

A Schneider, T Schaeffer, SK Giri - Physical Review D, 2023 - APS
The 21-cm power spectrum of reionization is a promising probe for cosmology and
fundamental physics. Exploiting this new observable, however, requires fast predictors …