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Browsing by Author "Roy, Nirupam"

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Calibration requirements for Epoch of Reionization 21-cm signal observations - II. Analytical estimation of the bias and variance with time-correlated residual gains

Kumar, Jais; Dutta, Prasun; Choudhuri, Samir; Roy, Nirupam (Oxford University Press, 2022-05-01)

Observation of redshifted 21-cm signals from neutral hydrogen holds the key to understanding the structure formation and its evolution during the reionization and post-reionization era. Apart from the presence of orders ...
Metrewave Galactic Plane with the uGMRT (MeGaPluG) Survey: Lessons from the pilot study

Dokara, Rohit; Roy, Nirupam; Menten, Karl; Vig, Sarita; Dutta, Prasun; Beuther, Henrik; Pandian, Jagadheep D.; Rugel, Michael; Rashid, Md; Brunthaler, Andreas (EDP Sciences, 2023-10-01)

Context. The advent of wide-band receiver systems on interferometer arrays has enabled the undertaking of high-sensitivity and highresolution radio continuum surveys of the Galactic plane in a reasonable amount of telescope ...
Probing galaxy evolution through Hi 21-cm emission and absorption: current status and prospects with square kilometre array

Dutta, Rajeshwari; Kurapati, Sushma; Aditya, J.N.H.S.; Bait, Omkar; Das, Mousumi; Dutta, Prasun; Indulekha, K.; Nandakumar, Meera; Patra, Narendra Nath; Roy, Nirupam; Roychowdhury, Sambit (Springer, 2022-12)

One of the major science goals of square kilometre array (SKA) is to understand the role played by atomic hydrogen (Hi) gas in the evolution of galaxies throughout cosmic time. The hyperfine transition line of the hydrogen ...
Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator - II. Cross-polarization power spectrum

Elahi, Kh.Md. Asif; Bharadwaj, Somnath; Ghosh, Abhik; Pal, Srijita; Ali, Sk. Saiyad; Choudhuri, Samir; Chakraborty, Arnab; Datta, Abhirup; Roy, Nirupam; Choudhury, Madhurima; Dutta, Prasun (Oxford University Press, 2023-04-01)

Neutral hydrogen (H I) 21-cm intensity mapping (IM) offers an efficient technique for mapping the large-scale structures in the Universe. We introduce the 'Cross' Tapered Gridded Estimator (Cross TGE), which cross-correlates ...
Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator - III. Foreground removal

Elahi, Kh Md Asif; Bharadwaj, Somnath; Pal, Srijita; Ghosh, Abhik; Ali, Sk Saiyad; Choudhuri, Samir; Chakraborty, Arnab; Datta, Abhirup; Roy, Nirupam; Choudhury, Madhurima; Dutta, Prasun (Oxford University Press, 2023-11-01)

Neutral hydrogen () 21-cm intensity mapping (IM) is a promising probe of the large-scale structures in the Universe. However, a few orders of magnitude brighter foregrounds obscure the IM signal. Here, we use the tapered ...

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