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 89 for “"Gaia"”.
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Galactic Archaeology with Gaia
… to the sparse density of the halo. The recent Gaia mission can open a new era for the study of Galactic Archaeology as it provides quality data for ~ 1.3 billion stars across the Milky Way which had remained uncharted so far. In Chapter 1, I describe a history of study on the Milky Way halo so …
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A Continuum of Traversing Lines: Youth Political Participation in Gaia Online
… are the politically oriented social forums in Gaia Online experienced as a continuum of overlapping of lines, including molar lines, lines of flight, and molecular lines?” Although smooth lines of flight may occur in Gaia, there are always mechanisms that work to re-territorialize them as more …
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Probing Late Stages of Stellar Evolution with Gaia-selected Planetary Nebulae
This thesis concerns the use of data from the Gaia satellite to study Galactic planetary nebulae. Gaia is a recent ESA mission measuring positions, parallaxes, proper motions, and photometry of nearly two billion stars in the Milky Way. Several thousand of these stars are passing through the …
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Characterization and mitigation of radiation damage on the Gaia Astrometric Field
… Space Agency (ESA) is planning to launch Gaia, a mission designed to measure with microarcsecond accuracy the astrometric properties of over a billion stars. Microarcsecond astrometry requires extremely accurate positional measurements of individual stellar transits on the focal plane, …
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Identifying and Analyzing Multi-Star Systems Among TESS Planetary Candidates Using Gaia
… databases such as those constructed by TESS and Gaia to bridge the gap between exoplanets and stellar companions. Data can then be analyzed for trends in these multi-star exoplanet systems and in juxtaposition to their single-star counterparts. This research was able to automate the data …
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The interrelationships of nature based on Thoreau's Walden and Lovelock's Gaia hypothesis
James Lovelock and Henry Thoreau propose a world view based on the connections between an individual and their personal landscape. This viewpoint is an alternative to the more prevalent world view of our mass society. The pervasive outlook disregards these connections and concentrates instead on …
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Development and Testing of a New Method for Velocity-Selecting White Dwarfs from Gaia by Galactic Population
… targets from a sample of white dwarfs from the Gaia DR3 catalog that have also been age-analysed using BASE-9. BASE-9 uses photometry, as well as prior measurements and values from ancillary data, such as trigonometric parallaxes, fitting up to nine stellar parameters for a given target. White …
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How to Accurately Map the Milky Way with a Billion Sources: A Journey into the Gaia-verse
… this. Well-constructed distances for the Gaia DR2 RVS sample return a velocity ellipsoid broadly consistent with spherical alignment. Using the reciprocal parallax distance estimator significantly alters the conclusions. I produce selection functions for catalogues needed to model the …
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Declarative Design for Spatial Analysis Models
… This research addresses this gap by proposing Gaia, a declarative Domain-Specific Language designed to express geographic data models. Gaia decouples the specification of spatial operations (the “what”) from execution strategies (the “how”). The Gaia transpiler automates execution optimizations …
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A influência da família e da televisão na alimentação das crianças do 4º ano do Concelho de Vila Nova de Gaia
… ao acaso, das 97 do Concelho de Vila Nova de Gaia. Em cada escola, uma turma do 4º ano foi seleccionada ao acaso e toda as crianças foram avaliadas. As respostas correspondem a 9,1 % de todas as crianças que frequentam o 4º ano nas escolas públicas do Concelho. As subescalas de “Aproximação …
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Gravitational Lensing in the Solar Neighbourhood and Towards the Milky Way Bulge
… unexplored. Leveraging astrometry from the Gaia satellite, I search for predicted close stellar alignments by lenses in the solar neighbourhood that will give rise to a microlensing event. Using Near-Infrared (NIR) photometry from the Vista Variables in the Via Lactea (VVV) survey, I extract …
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Fast Stars in the Milky Way
… that accelerate stars. I concisely summarise the Gaia mission, whose recent data releases heavily influenced this thesis. Supernovae in binary systems can fling away the companion; if a runaway companion can be associated with a supernova remnant, then together they reveal the evolution that led …
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Discovery and Characterisation of Gravitationally Lensed Quasars in Wide-field Surveys
… We use the excellent resolving ability of Gaia, coupled with other wide-field surveys such as the Dark Energy Survey (DES), Pan-STARRS, and WISE, and present spectroscopic follow-up from the WHT, NTT, and Keck. By looking for multiple Gaia detections around photometric quasar candidates, …
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Formation and dynamics of the Galactic disc and halo
The treasure trove of recent data from Gaia and spectroscopic surveys has revealed an abundance of features in the Milky Way that must be interpreted dynamically. The disc, the bar, the halo and the satellites are all components of the Galaxy's dynamical system which are able to interact to create, …
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Estudio comparativo de herramientas bioinformáticas para el análisis metagenómico sobre el microbioma humano
… más utilizados en la actualidad, que son: Gaia, Qiime2 y Mothur. Estos dos últimos son de código abierto por lo que para llevarlos a cabo se hizo uso de una máquina virtual de Ubuntu en Google Cloud. Gaia ha sido desarrollado por la empresa Sequentia Biotech, por lo que no hubo necesidad de …
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The effect of differential color refraction on astrometric observations of Solar System bodies and Earth satellites from ground-based optical telescopes
… exceeded this level. With the release of the Gaia DR2 star catalog in April of 2018, catalog error is no longer dominant and the systematic error ŕoor in ground-based astrometry is deőned by DCR.
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