290 citations · 1.8k across the 59 of their papers we have counts for
62 papers
ELAIS-N1 deep field uGMRT Band-2: constraints on diffuse Galactic synchrotron emission power spectrum
Rashmi Sagar, Abhirup Datta, Arnab Chakraborty +13
We present high sensitivity, low radio frequency continuum observations of the ELAIS-N1 field with 32 hours of observations of the uGMRT Band-2 ( MHz) covering $5.86\,\tex…
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 ap…
The re-markable 21-cm power spectrum I: Probing the HI distribution in the post-reionization era using marked statistics
Mohd Kamran, Martin Sahlén, Debanjan Sarkar +1
The neutral hydrogen (HI) power spectrum, measured from intensity fluctuations in the 21-cm background, offers insights into the large-scale structures (LSS) of our Universe in the…
Detecting ionized bubbles around luminous sources during the reionization era using HI 21-cm signal
Arnab Mishra, Chandra Shekhar Murmu, Kanan K. Datta +4
Measuring the properties of the intergalactic medium (IGM) and sources during the Epoch of Reionization (EoR) is of immense importance. We explore the prospects of probing the IGM…
Impact of the Epoch of Reionization sources on the 21-cm bispectrum
Leon Noble, Mohd Kamran, Suman Majumdar +5
The morphology of the 21-cm signal emitted by the neutral hydrogen present in the intergalactic medium (IGM) during the Epoch of Reionization (EoR) depends both on the properties o…
Project Hephaistos - II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
Matías Suazo, Erik Zackrisson, Priyatam K. Mahto +5
The search for extraterrestrial intelligence is currently being pursued using multiple techniques and in different wavelength bands. Dyson spheres, megastructures that could be con…
Extracting the Global 21-cm signal from Cosmic Dawn and Epoch of Reionization in the presence of Foreground and Ionosphere
Anshuman Tripathi, Abhirup Datta, Madhurima Choudhury +1
Detection of redshifted \ion{H}{i} 21-cm emission is a potential probe for investigating the Universe's first billion years. However, given the significantly brighter foreground, d…
Impact of astrophysical scatter on the Epoch of Reionization [H I] bispectrum
Chandra Shekhar Murmu, Kanan K. Datta, Suman Majumdar +1
It is believed that the first star-forming galaxies are the main drivers of cosmic reionization. It is usually assumed that there is a one-to-one relationship between the star form…
The monopole and quadrupole moments of the Epoch of Reionization (EoR) 21-cm bispectrum
Sukhdeep Singh Gill, Suman Pramanick, Somnath Bharadwaj +2
We study the monopole () and quadrupole () moments of the 21-cm bispectrum (BS) from EoR simulations and present results for squeezed and stretched triang…
The morphology of the redshifted 21-cm signal from the Cosmic Dawn
Raghunath Ghara, Satadru Bag, Saleem Zaroubi +1
The spatial fluctuations in the tomographic maps of the redshifted 21-cm signal from the Cosmic Dawn (CD) crucially depend on the size and distribution of the regions with gas temp…
Interpreting the HI 21-cm cosmology maps through Largest Cluster Statistics -- I: Impact of the synthetic SKA1-Low observations
Saswata Dasgupta, Samit Kumar Pal, Satadru Bag +7
We analyse the evolution of the largest ionized region using the topological and morphological evolution of the redshifted 21-cm signal coming from the neutral hydrogen distributio…
Probing the Epoch of Reionization using synergies of line intensity mapping
Chandra Shekhar Murmu, Raghunath Ghara, Suman Majumdar +1
The Epoch of Reionization (EoR) remains a poorly understood cosmic era for the most part. Yet, efforts are still going on to probe and understand this epoch. We present a review of…
Modelling the energy distribution in CHIME/FRB Catalog-1
Siddhartha Bhattacharyya, Somnath Bharadwaj, Himanshu Tiwari +1
We characterize the intrinsic properties of any FRB using its redshift , spectral index and energy in units of emitted across $2128 - 2848\; {\…
Observing the Reionization : Effect of Calibration and Position Errors on Realistic Observation Conditions
Aishrila Mazumder, Abhirup Datta, Arnab Chakraborty +1
Observation of the redshifted 21-cm signal from Cosmic Dawn and Epoch of Reionization is a challenging endeavor in observational cosmology. Presence of orders of magnitude brighter…
Redshifted 21-cm bispectrum: Impact of the source models on the signal and the IGM physics from the Cosmic Dawn
Mohd Kamran, Raghunath Ghara, Suman Majumdar +5
The radiations from the first luminous sources drive the fluctuations in the 21-cm signal at Cosmic Dawn (CD) via two dominant astrophysical processes i.e. the Ly coupling and X…
Extracting the 21-cm Power Spectrum and the reionization parameters from mock datasets using Artificial Neural Networks
Madhurima Choudhury, Abhirup Datta, Suman Majumdar
Detection of the \hi~ 21-cm power spectrum is one of the key science drivers of several ongoing and upcoming low-frequency radio interferometers. However, the major challenge in su…
Large HI optical depth and Redshifted 21-cm signal from cosmic dawn
Kanan K. Datta, Raghunath Ghara, Ariful Hoque +1
The HI 21-cm optical depth () can be considerably large as the kinetic and spin temperature of the inter-galactic medium (IGM) is expected to be very low during cosmic dawn. I…
Revisiting the [C II] line-intensity mapping power spectrum from the EoR using non-uniform line-luminosity scatter
Chandra Shekhar Murmu, Karen P. Olsen, Thomas R. Greve +9
Detecting the line-intensity mapping (LIM) signal from the galaxies of the Epoch of Reionization is an emerging tool to constrain their role in reionization. Ongoing and upcoming e…
A maximum likelihood estimate of the parameters of the FRB population
Siddhartha Bhattacharyya, Himanshu Tiwari, Somnath Bharadwaj +1
We consider a sample of non-repeating FRBs detected at Parkes, ASKAP, CHIME and UTMOST each of which operates over a different frequency range and has a different detection cr…
CII and HI 21-cm line intensity mapping from the EoR: Impact of the light-cone effect on auto and cross-power spectra
Chandra Shekhar Murmu, Suman Majumdar, Kanan K. Datta
CII line intensity mapping (LIM) is a potential technique to probe the early galaxies from the Epoch of Reionization (EoR). Several experiments e.g. CONCERTO, TIME, CCAT-p are unde…
Probing IGM Physics during Cosmic Dawn using the Redshifted 21-cm Bispectrum
Mohd Kamran, Suman Majumdar, Raghunath Ghara +5
With the advent of the first luminous sources at Cosmic Dawn (CD), the redshifted 21-cm signal, from the neutral hydrogen in the Inter-Galactic Medium (IGM), is predicted to underg…
Improving constraints on the reionization parameters using 21-cm bispectrum
Himanshu Tiwari, Abinash Kumar Shaw, Suman Majumdar +2
Radio interferometric experiments aim to constrain the reionization model parameters by measuring the 21-cm signal statistics, primarily the power spectrum. However the Epoch of Re…
A fast estimator for quantifying the shape dependence of the 3D bispectrum
Abinash Kumar Shaw, Somnath Bharadwaj, Debanjan Sarkar +3
The dependence of the bispectrum on the size and shape of the triangle contains a wealth of cosmological information. Here we consider a triangle parameterization which allows us t…
The Epoch of Reionization 21-cm Bispectrum: The impact of light-cone effects and detectability
Rajesh Mondal, Garrelt Mellema, Abinash Kumar Shaw +2
We study the spherically averaged bispectrum of the 21-cm signal from the Epoch of Reionization (EoR). This metric provides a quantitative measurement of the level of non-Gaussiani…