15 papers
Constraining the neutral hydrogen (HI) distribution
Minal Chhabra, Raghunath Ghara, Somnath Bharadwaj
We constrain the HI distribution by jointly modeling two independent, existing observations of the 21-cm signal, the HI density parameter measured using…
Fuzzy Dark Matter Halo Mass Functions at Cosmic Dawn
Raghunath Ghara, Adam Lidz, Daniel Grin +1
In fuzzy dark matter (FDM) cosmological models, wave effects impact astrophysical length scales, suppressing the abundance of small mass dark matter halos, and delaying the earlies…
POLAR-II: modeling star formation history of galaxies on the 21-cm signal from Epoch of Reionization
Qing-Bo Ma, Raghunath Ghara, Benedetta Ciardi +6
Galaxies may suffer some starburst and quenched periods in their history due to e.g. galaxy mergers and feedback. However, semi-numerical simulations of the Epoch of Reionization (…
Enhancing the detectability of ionized Regions during the Epoch of Reionization
Rutvik Ashish Mahajan, Raghunath Ghara, Nishant Pradeep Deo +1
We present an improved matched filter method for detecting large ionized regions in 21 cm observations of the Epoch of Reionization. In addition to detection, the method constrains…
Asking Fast Radio Bursts for More than Reionization History
Abinash Kumar Shaw, Raghunath Ghara, Paz Beniamini +2
We propose different estimators to probe the intergalactic medium (IGM) during epoch of reionization (EoR) using the dispersion measure () of the fast radio bursts. We co…
The Effect of Large Optical Depths on the Non-Gaussian 21-cm signal from Cosmic Dawn
Iffat Nasreen, Kanan K. Datta, Abinash K. Shaw +6
During the Cosmic Dawn (CD), the HI 21-cm optical depth ( ) in the intergalactic medium can become significantly large. Consequently, the second and higher-order terms of …