Search Results - "Choudhury, T."

Cosmic reionization after Planck by Mitra, Sourav, Choudhury, T. Roy, Ferrara, Andrea

“…Cosmic reionization holds the key to understand structure formation in the Universe, and can inform us about the properties of the first sources, as their star…”
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21 cm signal from cosmic dawn: imprints of spin temperature fluctuations and peculiar velocities by Ghara, Raghunath, Choudhury, T. Roy, Datta, Kanan K.

“…The 21 cm brightness temperature δT b fluctuations from reionization promise to provide information on the physical processes during that epoch. We present a…”
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Studying the Lyman α optical depth fluctuations at z ∼ 5.5 using fast semi-numerical methods by Choudhury, T Roy, Paranjape, Aseem, Bosman, Sarah E I

“…ABSTRACT We present a computationally efficient and fast semi-numerical technique for simulating the Lyman α (Ly α) absorption optical depth in presence of…”
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21 cm signal from cosmic dawn – II. Imprints of the light-cone effects by Ghara, Raghunath, Datta, Kanan K., Choudhury, T. Roy

“…Details of various unknown physical processes during the cosmic dawn and the epoch of reionization can be extracted from observations of the redshifted 21 cm…”
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Bayesian approach to constraining the properties of ionized bubbles during reionization by Ghara, Raghunath, Choudhury, T Roy

“…ABSTRACT A possible way to study the reionization of cosmic hydrogen is by observing the large ionized regions (bubbles) around bright individual sources, e.g…”
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Modelling the cosmic neutral hydrogen from DLAs and 21-cm observations by Padmanabhan, Hamsa, Choudhury, T. Roy, Refregier, Alexandre

“…We review the analytical prescriptions in the literature to model the 21-cm (emission line surveys/intensity mapping experiments) and Damped Lyman-Alpha (DLA)…”
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Imaging the redshifted 21 cm pattern around the first sources during the cosmic dawn using the SKA by Ghara, Raghunath, Choudhury, T Roy, Datta, Kanan K, Choudhuri, Samir

“…Understanding properties of the first sources in the Universe using the redshifted H I 21 cm signal is one of the major aims of present and upcoming…”
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Photon number conserving models of H ii bubbles during reionization by Paranjape, Aseem, Choudhury, T Roy, Padmanabhan, Hamsa

“…Traditional excursion-set-based models of H ii bubble growth during the epoch of reionization are known to violate photon number conservation, in the sense…”
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21-cm signature of the first sources in the Universe: prospects of detection with SKA by Ghara, Raghunath, Choudhury, T. Roy, Datta, Kanan K.

“…Currently several low-frequency experiments are being planned to study the nature of the first stars using the redshifted 21-cm signal from the cosmic dawn and…”
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An improved model of H ii bubbles during the epoch of reionization by Paranjape, Aseem, Choudhury, T. Roy

“…The size distribution of ionized regions during the epoch of reionization – a key ingredient in understanding the H i power spectrum observable by 21 cm…”
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On the use of seminumerical simulations in predicting the 21-cm signal from the epoch of reionization by Majumdar, Suman, Mellema, Garrelt, Datta, Kanan K., Jensen, Hannes, Choudhury, T. Roy, Bharadwaj, Somnath, Friedrich, Martina M.

“…We present a detailed comparison of three different simulations of the epoch of reionization (EoR). The radiative transfer simulation (c 2 -ray) among them is…”
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Prediction of the 21-cm signal from reionization: comparison between 3D and 1D radiative transfer schemes by Ghara, Raghunath, Mellema, Garrelt, Giri, Sambit K, Choudhury, T Roy, Datta, Kanan K, Majumdar, Suman

“…Abstract Three-dimensional radiative transfer simulations of the epoch of reionization can produce realistic results, but are computationally expensive. On the…”
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Source of metal contamination in sediment, their ecological risk, and phytoremediation ability of the studied mangrove plants in ship breaking area, Bangladesh by Rahman, M. Safiur, Hossain, M. Belal, Babu, S.M. Omar Faruque, Rahman, Moshiur, Ahmed, A.S. Shafiuddin, Jolly, Y.N., Choudhury, T.R., Begum, B.A., Kabir, J., Akter, S.

“…Samples for sediment and two species of native mangrove plants were collected from seven sampling sites for assessing the level of metal contamination. Results…”
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Cosmological implications of the composite spectra of galactic X-ray binaries constructed using MAXI data by Islam, Nazma, Ghara, Raghunath, Paul, Biswajit, Choudhury, T Roy, Nath, Biman B

“…We have investigated the long-term average spectral properties of galactic X-ray binaries in the energy range of 3-20 keV, using long-term monitoring data from…”
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Geological Risk Uncertainty in Oil Exploration by Choudhury, T. K.

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Studying neutral hydrogen structures during the epoch of reionization using fractal dimensions by Bandyopadhyay, Bidisha, Choudhury, T Roy, Seshadri, T R

“…Fractal dimensions can be used to characterize the clustering and lacunarities in density distributions. We use generalized fractal dimensions to study the…”
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Reionization constraints on primordial magnetic fields by Pandey, Kanhaiya L., Choudhury, T. Roy, Sethi, Shiv K., Ferrara, Andrea

“…We study the impact of the extra density fluctuations induced by primordial magnetic fields on the reionization history in the redshift range: 6 < z < 10. We…”
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A theoretician's analysis of the supernova data and the limitations in determining the nature of dark energy by Padmanabhan, T., Choudhury, T. Roy

“…Current cosmological observations show a strong signature of the existence of a dark energy component with negative pressure. The most obvious candidate for…”
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Cosmic reionization after Planck II: contribution from quasars by Mitra, Sourav, Choudhury, T. Roy, Ferrara, Andrea

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The effect of peculiar velocities on the epoch of reionization 21-cm signal by Majumdar, Suman, Bharadwaj, Somnath, Choudhury, T. Roy

“…We have used seminumerical simulations of reionization to study the behaviour of the power spectrum of the epoch of reionization 21-cm signal in redshift…”
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