14 citations · 57 across the 19 of their papers we have counts for
20 papers
Foreground Characterization and Mitigation in the Observations of the CD/EoR with the SKA
Philip Bull, Jacob Burba, Emilio Ceccotti +20
The Square Kilometre Array (SKA), with its unprecedented sensitivity, frequency coverage, and large collecting area, is poised to revolutionize our understanding of the Cosmic Dawn…
Overview of 21cm Experiments at high redshift with SKAO
CD Science Working Group, Gianni Bernardi, Daniela Breitman +81
We provide an overview of the eight SKAO Science Book chapters that motivate the Epoch of Reionisation and Cosmic Dawn experiments with SKA-Low. We describe the individual SKA-Low…
Methodological Frontiers in 21-cm Intensity Mapping: the Treatment of Systematics and Foreground Contamination
Marta Spinelli, Matilde Barberi-Squarotti, José Luis Bernal +29
The distribution of neutral hydrogen (HI) in the post-reionization universe traces the cosmic large-scale structure and therefore serves as a powerful cosmological probe. An effici…
Observations of the Cosmic Dawn and Epoch of Reionization with the SKAO: Observational Lessons Learned from Precursors and Pathfinder Instruments
Eloy de Lera Acedo, James Aguirre, Dominic Anstey +34
This chapter summarizes the observational lessons learned after two decades of observations of the Cosmic Dawn (CD) and Epoch of Reionization (EoR) with SKAO pathfinders and precur…
Observational Frontiers in the post-EoR 21-cm Intensity Mapping: Lessons from the SKA Pathfinders
Khandakar Md Asif Elahi, Somnath Bharadwaj, Philip Bull +21
The 21-cm line from neutral hydrogen has long been recognised as a promising tracer of the large-scale structure of the Universe. The line is weak however, making individual galaxy…
The Tracking Tapered Gridded Estimator for the 21-cm power spectrum from the Murchison Widefield Array (MWA) drift scan observations -- III. Improved upper limits at from multiple pointings
Shouvik Sarkar, Khandakar Md Asif Elahi, Samir Choudhuri +5
We analyze zenith-pointing Murchison Widefield Array (MWA) drift scan observations covering with 1…
Bayes-SCF: A Bayesian filter to mitigate foreground leakage in the 21-cm power spectrum
Khandakar Md Asif Elahi
Missing channels in radio-interferometric visibility data can introduce systematic artefacts into the estimated 21-cm power spectrum. A common workaround is to first estimate the t…
The Epoch of Reionization 21 cm Bispectrum at from MWA data II: Smooth Component Filtering
Sukhdeep Singh Gill, Khandakar Md Asif Elahi, Somnath Bharadwaj +2
The 21 cm bispectrum (BS) offers a powerful probe of the Epoch of Reionization (EoR), but its observational access is severely hindered by dominant astrophysical foregrounds. Consi…
Deep uGMRT observations for enhanced calibration of 21 cm arrays -- I. First image and source catalogue
Khandakar Md Asif Elahi, Samir Choudhuri, Nirupam Roy +3
Radio-interferometric arrays require very precise calibration to detect the Epoch of Reionization 21-cm signal. A remarkably complete and accurate sky model is therefore needed in…
The EoR 21-cm Bispectrum at from MWA data I: Foregrounds and preliminary upper limits
Sukhdeep Singh Gill, Somnath Bharadwaj, Khandakar Md Asif Elahi +2
We attempt to measure the Epoch of Reionization (EoR) 21-cm bispectrum (BS) using Murchison Widefield Array (MWA) data. We find that $B(k_{1\perp}, k…
A measurement of Galactic synchrotron emission using MWA drift scan observations
Suman Chatterjee, Shouvik Sarkar, Samir Choudhuri +4
Studying the diffuse Galactic synchrotron emission (hereafter, DGSE) at arc-minute angular scale is important to remove the foregrounds for the cosmological 21-cm observations. Sta…
The Evolving Power Spectrum for the light cone Epoch of Reionization (EoR) 21-cm signal
Suman Pramanick, Somnath Bharadwaj, Khandakar Md Asif Elahi +1
The rapid evolution of the cosmological neutral hydrogen (HI) distribution during the EoR is imprinted along the line of sight (LoS) in the redshifted 21-cm signal due to the light…
Calibration requirements for Epoch of Reionization 21-cm signal observations -- IV. Bias and variance with time and frequency correlated residual gains
Saikat Gayen, Jais Kumar, Prasun Dutta +3
Observation of multifrequency angular power spectrum of the redshifted 21-cm brightness temperature fluctuation from the neutral hydrogen holds the key to understand the structure…
A visibility-based angular bispectrum estimator for radio-interferometric data
Sukhdeep Singh Gill, Somnath Bharadwaj, Sk. Saiyad Ali +1
Considering radio-interferometric observations, we present a fast and efficient estimator to compute the binned angular bispectrum (ABS) from gridded visibility data. The estimator…
The Tracking Tapered Gridded Estimator for the 21-cm power spectrum from MWA drift scan observations II: The Missing Frequency Channels
Khandakar Md Asif Elahi, Somnath Bharadwaj, Suman Chatterjee +4
Missing frequency channels pose a problem for estimating the redshifted 21-cm power spectrum (PS) from radio-interferometric visibility data. This is parti…
The Tracking Tapered Gridded Estimator for the 21-cm power spectrum from MWA drift scan observations I: Validation and preliminary results
Suman Chatterjee, Khandakar Md Asif Elahi, Somnath Bharadwaj +4
Drift scan observations provide the broad sky coverage and instrumental stability needed to measure the Epoch of Reionization (EoR) 21-cm signal. In such observations, the telescop…
Towards -cm intensity mapping at with uGMRT using the tapered gridded estimator -- IV. Wideband analysis
Khandakar Md Asif Elahi, Somnath Bharadwaj, Srijita Pal +8
We present a Wideband Tapered Gridded Estimator (TGE), which incorporates baseline migration and variation of the primary beam pattern for neutral hydrogen (${\rm H\hspace{0.5mm}}{…
Towards -cm intensity mapping at with uGMRT using the tapered gridded estimator III: Foreground removal
Khandakar Md Asif Elahi, Somnath Bharadwaj, Srijita Pal +8
Neutral hydrogen (HI) -cm intensity mapping (IM) is a promising probe of the large-scale structures in the Universe. However, a few orders of magnitude brighter foregrounds obs…
Towards -cm intensity mapping at with uGMRT using the tapered gridded estimator II: Cross-polarization power spectrum
Kh. Md. Asif Elahi, Somnath Bharadwaj, Abhik Ghosh +8
Neutral hydrogen () -cm intensity mapping (IM) offers an efficient technique for mapping the large-scale structures in the universe. We introduce the 'Cross' Tapered G…
Towards 21-cm Intensity Mapping at with uGMRT using the Tapered Gridded Estimator I: Foreground Avoidance
Srijita Pal, Kh. Md. Asif Elahi, Somnath Bharadwaj +8
The post-reionization neutral hydrogen (HI) 21-cm intensity mapping signal holds the potential to probe the large scale structures, study the expansion history and cons…