Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Radio interferometers"”.
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Investigating the Epoch of Cosmic Reionisation with Radio Interferometers
… is a prime objective of modern low-frequency radio interferometers, though instrumental systematics and calibration errors pose an immense challenge. This thesis explores a method of detecting the fluctuations of the cosmological signal by means of the closure phase, a calibration-independent …
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Accelerating radio transient detection using the Bispectrum algorithm and GPGPU
Modern radio interferometers such as those in the Square Kilometre Array (SKA) project are powerful tools to discover completely new classes of astronomical phenomena. Amongst these phenomena are radio transients. Transients are bursts of electromagnetic radiation and is an exciting area of …
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It's always darkest before the cosmic dawn : early results from novel tools and telescopes for 21 cm cosmology
… By making tomographic maps with low frequency radio interferometers, we can study the evolution of the 21 cm signal with time and spatial scale and use it to understand the density, temperature, and ionization evolution of the intergalactic medium over this dramatic period in the history of the …
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Characterization and Mitigation of Terrestrial and Astrophysical Foreground Effects in 21cm Cosmology
… the characterization and mitigation of VHF-band radio frequency interference (RFI), and the last two being devoted to the characterization and mitigation of astrophysical foregrounds in radio interferometers, in the presence of mutual coupling between array elements. First, The SDR Pathfinder for …
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Probabilistic methods for radio interferometry data analysis
… method to the analysis of visibility data from radio interferometers. Any radio interferometry observation can be described using the Radio Interferometry Measurement Equation (RIME). Throughout the thesis, we use the RIME to model the visibilities in performing the probabilistic analysis. We …
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Quenching mechanisms in recently quenched elliptical galaxies: insights from neutral hydrogen studies and environmental analysis
… factors. Future observations with advanced radio interferometers like SKA will be crucial for elucidating the quenching mechanisms in RQEs and their role in galaxy evolution.
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21 cm cosmology with optimized instrumentation and algorithms
… of the MIT Epoch of Reionization (MITEoR) radio telescope, an interferometric array of 64-dual polarization antennas whose goal was to test technology and algorithms for incorporation into the Hydrogen Epoch of Reionization Array (HERA). In four papers, I develop, test and improve many …
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Circumstellar Structure Properties of Young Stellar Objects: Envelopes, Bipolar Outflows, and Disks
… and circumstellar disks, have been studied using radio interferometers: the Berkeley-Illinois-Maryland Association (BIMA) array and the Combined Array for Research in Millimeter-wave Astronomy (CARMA). (1) Envelopes: Three Class 0 YSOs (L1448 IRS 2, L1448 IRS 3, and L1157) have been observed by …
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Meshless hydrodynamic simulations of young supernova remnants
… that have been detected at all wavelengths, from radio to gamma-rays. For several dozen supernova remnants, very-long-baseline radio interferometers have spatially resolved the interaction region and directly measured the expansion rates of the shocked gas; many show evidence of the interaction of …
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A Pathway to EMU: the SCORPIO Project
We are entering a golden age for radio astronomy. There are several new interferometers upcoming, whose characteristics, in terms of sensitivity, frequency coverage, angular and temporal resolution, field of view, will permit unprecedented deep observations. The most outstanding ones among them …