School and Workshop on 21-cm Cosmology

Session

Session 1

9 Mar 2026, 10:05

AG66

Conveners

Session 1

• Chair: Mayuri Rao (RRI)

49. Distinguishing between Reionisation Source Models in SKA-Low 21-cm Intensity Maps using the Largest Cluster Statistic

Manas Mohit Dosibhatla (IIT Indore)

09/03/2026, 10:05

The redshifted 21-cm signal emitted by neutral Hydrogen (HI) is a promising probe to understand the evolution of the topology and morphology of ionised regions during the Epoch of Reionisation (EoR). The morphology of ionised regions allows us to infer the nature and properties of ionising sources, i.e., early galaxies and AGNs. Traditional Fourier statistics, such as the power spectrum, help...

29. Propagation, Refraction and Scattering Effects in Low-Frequency Radio Observations: Implications for Precision 21-cm Cosmology

Ganesh Jaiswal (IIT Kanpur)

09/03/2026, 10:25

"Detecting the redshifted H I 21-cm signal from the Cosmic Dawn and Epoch of Reionization requires exquisite control over propagation effects that distort low-frequency radio measurements before they reach the interferometer. In this talk, I will discuss how plasma-induced refraction, scattering and frequency-dependent path distortions, arising from both the terrestrial ionosphere and...

28. Deep uGMRT Band-2 Imaging of MWA EoR Fields: Towards a High-Fidelity Sky Model for 21-cm Cosmology and SKA Science

Pritam Hore (IIT Indore)

Detecting the redshifted 21-cm signal from the Epoch of Reionization (EoR) and Cosmic Dawn requires extremely precise calibration of low-frequency interferometric arrays. Small errors in the sky model can imprint artificial spectral structure in the gain solutions and leak bright foregrounds into the EoR window of the power spectrum. Wide-area surveys such as TGSS, GLEAM, and GLEAM-X provide a...

30. Impact of calibration errors and instrumental noise for SKA1-Low on HI 21 cm maps from the Epoch of Reionization

Samit Kumar Pal (IIT Indore)

The Cosmic Dawn (CD) and the Epoch of Reionization (EoR) represent a crucial phase in cosmic evolution, marking the emergence of the first luminous sources that ionized the intergalactic medium (IGM). Interferometric 21 cm experiments are designed to probe the redshifted 21 cm signal from neutral hydrogen during CD/EoR epochs to infer about the early universe. The upcoming SKA1-Low is expected...