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 20 of 20 for “"Intensity mapping"”.
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Digital Signal Processing for the Canadian Hydrogen Intensity Mapping Experiment
… processing systems for the Canadian Hydrogen Intensity Mapping Experiment (CHIME) and its Pathfinder. CHIME is designed to investigate the behaviour of Dark Energy in order to constrain its physical mechanism; it will do so by examining the geometry of the recent universe using as a `standard …
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A study of satellite contamination for single dish Hi intensity mapping with MeerKAT
HI Intensity Mapping is a novel technique that involves detecting the 21 cm emission lines from a large sky area without resolving individual sources, which proves to be a powerful probe for large scale structure cosmology. However, due to the weak nature of the 21 cm line, the majority of the …
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Development of superconducting microwave resonators for terahertz intensity mapping from balloon and space
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Detecting the turnover of the power spectrum with SKAO and other surveys
… key for probing ultra-large scales. Employing intensity mapping and galaxy surveys, we utilize Fisher forecasts and Markov Chain Monte Carlo simulations to model and analyze this subtle cosmological signature. Our findings reveal that SKA-MID Band 1 demonstrates the highest detection …
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Detecting the turnover of the power spectrum with SKAO and other surveys
… key for probing ultra-large scales. Employing intensity mapping and galaxy surveys, we utilize Fisher forecasts and Markov Chain Monte Carlo simulations to model and analyze this subtle cosmological signature. Our findings reveal that SKA-MID Band 1 demonstrates the highest detection …
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Studying the Large Scale Structure and interstellar Medium of Galaxies During the Epochs of Peak Cosmic Star formation and Reionization With Infrared Fine Structure Lines
… obtained with an imaging spectrometer. The intensity mapping approach measures the spatio-spectral fluctuations due to line emission from all galaxies, including those below the individual detection threshold. The technique provides 3-D measurements of galaxy clustering and moments of the …
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Probing Cosmology with the MeerKAT Interferometer
Intensity mapping is a novel technique that has provided significant insights into the large-scale structure of the Universe. This thesis investigates the use of the Hi intensity mapping technique with data from the MeerKAT International GHzTiered Extragalactic Explorations (MIGHTEE) Survey. In …
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Cosmological constraints using 2- and 3-point correlations with meerkat, the ska and other surveys
… will be crucial to exploiting next-generation intensity mapping experiments. Upcoming surveys by SKAO and HIRAX will undertake intensive line-intensity observations, complementing galaxy surveys. This study provides new forecasts on cosmological constraints derived from the combined analysis of …
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Projected Angular Statistics for Large-scale Structure Cosmology
… projected in redshift bins. Similarly, line-intensity mapping (LIM) surveys measure fluctuations in the sky brightness in narrow frequency bands. This thesis considers the statistics of such projected observables, spanning theoretical modelling, simulation and data analysis. In the first …
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DESIGN, CONSTRUCTION, AND SCIENCE FORECASTS FOR THE TERAHERTZ INTENSITY MAPPER
… the early-stage development of the Terahertz Intensity Mapper (TIM). TIM isa balloon-borne far infrared (FIR) telescope fielding novel cryogenic kinetic inductance detectors. TIM combines two long-slit grating spectrometers to cover 240-420 microns at a resolving power of R = 250. Building on …
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The terahertz intensity mapper: development of the cryogenic receiver
… surveys extremely challenging. The Terahertz Intensity Mapper (\TIM), a balloon-borne spectroscopic telescope operating in the stratosphere, overcomes these limitations and enables the mapping of galaxies following the peak epoch of cosmic star formation. \TIM will pioneer line intensity …
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Robotic radiation mapping using modelling and probabilistic analysis of sparse data
An approach for generating radiation intensity maps, comprised of a mobile robotic platform and an integrated radiation model, is presented, and its ability to generate accurate radiation maps in simulation studies as well as real-life exposure scenarios are investigated. The radiation intensity …
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Controlling for the Ionospheric and Baseline-Offset Uncertainties in the CHIME/FRB Outriggers VLBI Network for Milliarcsecond Precision
… on their journey to Earth. The Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB project has led the field with the hundreds of FRB detections the collaboration has published to date. However, these detections typically have localization regions so large that we cannot identify a single …
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Investigating the nature of Peculiar Supernovae and Fast Radio Bursts via their multi-wavelength properties and environments
… these two phenomena. Using the Canadian Hydrogen Intensity Mapping Experiment for Fast Radio Burst telescope data and complementary data from imaging telescopes, I identified likely host galaxies for three FRBs, revealing star-forming galaxies in early-type and transitional evolutionary stages as …
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Mathematical methods for classifying fast radio bursts
… the nature of the distant Universe. The Hydrogen Intensity Real-time eXperiment (HIRAX) is a next-generation instrument specifically designed to detect and localise FRB along with intensity mapping. To efficiently manage the high-volume data stream generated by HIRAX, a dedicated FRB processing …
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Probing the Diversity of Fast Radio Bursts with CHIME/FRB
… of the Universe. The Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB project has revolutionized the FRB field with its field-leading discovery rate. With CHIME/FRB, we can start to carry out population-level studies of FRBs to constrain their origins and inform their use as …
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Probing diffuse galactic synchrotron emission using meerkat single dish data
… hydrogen (HI) line has been measured using the intensity mapping (IM) method. Measuring this HI line is a complex process because it is faint and easily contaminated by radio frequency interference (RFI) and the foregrounds. Using the MeerKLASS experiment, from the L-band (900-1670 MHz) data the …
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Localization and Lensing of Fast Radio Bursts using CHIME/FRB and its VLBI Outriggers
… their host galaxies using the Canadian Hydrogen Intensity Mapping Experiment (CHIME) is perhaps the single most promising path towards uncovering the mystery of FRBs. CHIME detects about 700 FRBs per year, but lacks the resolution to pinpoint its bursts. Very-long baseline interferometry (VLBI) …
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Robust Estimation Techniques for the Cosmological Analysis of Large Scale Structure
… of the vast regions that can be covered by intensity mapping. We find percent-level accuracy when comparing the prediction for the density in spheres probability density function to the IllustrisTNG simulation. The measured density dependent clustering signal, which could be used to break …
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CREATING TEST MECHANISMS FOR SILICON SUBSTRATE BASED (SSB) DEVICES FOR USE IN FAR-IR TO MILLIMETER ASTROPHYSICAL SPECTROSCOPY
… R~100. The science cases for EoR-Spec are line intensity mapping, focusing on the [CII] 158 um line and the [OIII] 88 um line that can be used to reveal the processes of reionization and galaxy formation in the early Universe. [CII] and [OIII] are prime candidates for this science because they …