Search Results - "Choudhuri, Samir"

A study of Kepler supernova remnant: angular power spectrum estimation from radio frequency data by Saha, Preetha, Bharadwaj, Somnath, Roy, Nirupam, Choudhuri, Samir, Chattopadhyay, Debatri

“…ABSTRACT Supernova remnants (SNRs) have a variety of overall morphology as well as rich structures over a wide range of scales. Quantitative study of these…”
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Statistical Recovery of 21 cm Visibilities and Their Power Spectra with Gaussian-constrained Realizations and Gibbs Sampling by Kennedy, Fraser, Bull, Philip, Wilensky, Michael J., Burba, Jacob, Choudhuri, Samir

“…Abstract Radio interferometers designed to probe the 21 cm signal from Cosmic Dawn and the Epoch of Reionization must contend with systematic effects that make…”
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The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey by Choudhuri, Samir, Bharadwaj, Somnath, Ali, Sk. Saiyad, Roy, Nirupam, Intema, Huib. T., Ghosh, Abhik

“…Abstract Characterizing the diffuse Galactic synchrotron emission at arcminute angular scales is needed to reliably remove foregrounds in cosmological 21-cm…”
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The auto- and cross-angular power spectrum of the Cas A supernova remnant in radio and X-ray by Saha, Preetha, Bharadwaj, Somnath, Chakravorty, Susmita, Roy, Nirupam, Choudhuri, Samir, Günther, Hans Moritz, Smith, Randall K

“…ABSTRACT The shell type supernova remnant (SNR) Cas A exhibits structures at nearly all angular scales. Previous studies show the angular power spectrum (Cℓ)…”
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Patterns of primary beam non-redundancy in close-packed 21 cm array observations by Choudhuri, Samir, Bull, Philip, Garsden, Hugh

“…ABSTRACT Radio interferometer arrays such as HERA consist of many close-packed dishes arranged in a regular pattern, giving rise to a large number of…”
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Turbulent power spectrum in warm and cold neutral medium using the Galactic H  i 21 cm emission by Choudhuri, Samir, Roy, Nirupam

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Demonstrating the Tapered Gridded Estimator (TGE) for the Cosmological HI 21-cm Power Spectrum using 150 MHz GMRT observations by Pal, Srijita, Bharadwaj, Somnath, Ghosh, Abhik, Choudhuri, Samir

“…Abstract We apply the Tapered Gridded Estimator (TGE) for estimating the cosmological 21-cm power spectrum from 150 MHz GMRT observations which corresponds to…”
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An Image-based Tapered Gridded Estimator (ITGE) for the angular power spectrum by Choudhuri, Samir, Dutta, Prasun, Bharadwaj, Somnath

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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 by Kumar, Jais, Dutta, Prasun, Choudhuri, Samir, Roy, Nirupam

“…ABSTRACT Observation of redshifted 21-cm signals from neutral hydrogen holds the key to understanding the structure formation and its evolution during the…”
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A Tapered Gridded Estimator (TGE) for the multifrequency angular power spectrum (MAPS) and the cosmological H  i 21-cm power spectrum by Bharadwaj, Somnath, Pal, Srijita, Choudhuri, Samir, Dutta, Prasun

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The visibility-based tapered gridded estimator (TGE) for the redshifted 21-cm power spectrum by Choudhuri, Samir, Bharadwaj, Somnath, Chatterjee, Suman, Ali, Sk Saiyad, Roy, Nirupam, Ghosh, Abhik

“…We present an improved visibility-based tapered gridded estimator (TGE) for the power spectrum of the diffuse sky signal. The visibilities are gridded to…”
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Angular power spectrum of supernova remnants: effects of structure, geometry, and diffuse foreground by Choudhuri, Samir, Saha, Preetha, Roy, Nirupam, Bharadwaj, Somnath, Dey, Jyotirmoy

“…ABSTRACT The study of the intensity fluctuation power spectrum of individual supernova remnants (SNRs) can reveal the structures present at sub-pc scales, and…”
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Visibility-based angular power spectrum estimation in low-frequency radio interferometric observations by Choudhuri, Samir, Bharadwaj, Somnath, Ghosh, Abhik, Ali, Sk. Saiyad

“…We present two estimators to quantify the angular power spectrum of the sky signal directly from the visibilities measured in radio interferometric…”
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Stringent constraint on the radio signal from dark matter annihilation in dwarf spheroidal galaxies using the TGSS by Basu, Arghyadeep, Roy, Nirupam, Choudhuri, Samir, Datta, Kanan K, Sarkar, Debajyoti

“…ABSTRACT Weakly interacting massive particles (WIMPs) are considered to be one of the favoured dark matter candidates. Searching for any detectable signal due…”
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Detailed study of ELAIS N1 field with the uGMRT – II. Source properties and spectral variation of foreground power spectrum from 300–500 MHz observations by Chakraborty, Arnab, Roy, Nirupam, Datta, Abhirup, Choudhuri, Samir, Datta, Kanan K, Dutta, Prasun, Bharadwaj, Somnath, Intema, Huib, Choudhury, Madhurima, Pal, Srijita, Choudhury, Tirthankar Roy

“…ABSTRACT Understanding the low-frequency radio sky in depth is necessary to subtract foregrounds in order to detect the redshifted 21 cm signal of neutral…”
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The tracking tapered gridded estimator for the power spectrum from drift scan observations by Chatterjee, Suman, Bharadwaj, Somnath, Choudhuri, Samir, Sethi, Shiv, Patwa, Akash Kumar

“…ABSTRACT Intensity mapping with the redshifted 21-cm line is an emerging tool in cosmology. Drift scan observations, where the antennas are fixed to the ground…”
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Characterizing EoR foregrounds: a study of the Lockman Hole region at 325 MHz by Mazumder, Aishrila, Chakraborty, Arnab, Datta, Abhirup, Choudhuri, Samir, Roy, Nirupam, Wadadekar, Yogesh, Ishwara-Chandra, C H

“…ABSTRACT One of the key science goals for the most sensitive telescopes, both current and upcoming, is the detection of the redshifted 21-cm signal from the…”
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All-sky angular power spectrum – I. Estimating brightness temperature fluctuations using the 150-MHz TGSS survey by Choudhuri, Samir, Ghosh, Abhik, Roy, Nirupam, Bharadwaj, Somnath, Intema, Huib T, Ali, Sk Saiyad

“…ABSTRACT Measurements of the Galactic synchrotron emission are important for the 21-cm studies of the epoch of reionization. The study of synchrotron emission…”
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Detailed study of the ELAIS N1 field with the uGMRT – I. Characterizing the 325 MHz foreground for redshifted 21 cm observations by Chakraborty, Arnab, Datta, Abhirup, Choudhuri, Samir, Roy, Nirupam, Intema, Huib, Choudhury, Madhurima, Datta, Kanan K, Pal, Srijita, Bharadwaj, Somnath, Dutta, Prasun, Choudhury, Tirthankar Roy

“…Abstract In this first paper of the series, we present initial results of newly upgraded Giant Metrewave Radio Telescope (uGMRT) observation of European…”
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Tapering the sky response for angular power spectrum estimation from low-frequency radio-interferometric data by Choudhuri, Samir, Bharadwaj, Somnath, Roy, Nirupam, Ghosh, Abhik, Ali, Sk. Saiyad

“…It is important to correctly subtract point sources from radio-interferometric data in order to measure the power spectrum of diffuse radiation like the…”
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