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 137 for “"Milky Way"”.
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Fast Stars in the Milky Way
… comprehensive investigation of fast stars in the Milky Way, from brisk disc stars to stars escaping the Galaxy. My thesis is that fast stars are the smoking guns of extreme stellar collisions and explosions, and so can act as an intermediary to studying these theoretically-unconquered …
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Understanding the Milky Way with Stars
… formation, suggests that galaxies, including the Milky Way, assemble through the accretion of smaller systems, over a scaffolding of the invisible Dark Matter. Such growth is evidenced by the differences in stellar structures found in the Galaxy over the last few decades, accelerated most recently …
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Search for Ultra-faint Milky Way Satellites
… satellite” problem: the distribution of observed Milky Way satellite galaxies appears to form a thin polar plane, which is largely inconsistent with the prediction of the standard cosmological model, i.e. an isotropic distribution of dark matter sub-halos. This problem was often seen as a …
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Search for Ultra-faint Milky Way Satellites
… satellite” problem: the distribution of observed Milky Way satellite galaxies appears to form a thin polar plane, which is largely inconsistent with the prediction of the standard cosmological model, i.e. an isotropic distribution of dark matter sub-halos. This problem was often seen as a …
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Weighing the Milky Way While Exploring Dynamical Disequilibrium
… remains a fundamental problem, understanding the Milky Way’s disequilibrium also becomes important. In this thesis, we developed new algorithms to simultaneously fit the Solar Neighborhood gravitational potential and the stellar distribution in phase spaces. Such simultaneous fittings not only …
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Phase Space Structure of Disequilibrium in the Milky Way
… structure in the vertical phase space of the Milky Way have been made. In this thesis we set out to explain these structures, using a combination of analytic modeling, simulations, and Dynamic Mode Decomposition to study explicitly their formation and evolution in the presence of self gravity. …
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The Methodology of Modelling the Milky Way with Stellar Streams
… we examine the methodology of modelling the Milky Way using stellar streams. Using the orbit-fitting method we show that combining constraints from the Sagittarius stream with a suite of other photometric and kinematic observations of the Milky Way suggests a triaxial dark matter halo with …
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X-ray binaries in the Milky Way and other galaxies
Die vorliegende Arbeit beschäftigt sich im ersten Teil mit der Verteilung und den Eigenschaften der Populationen von Röntgendoppelsternen in der Milchstraße. Im zweiten Teil geht es um den Zusammenhang zwischen der Sternentstehungsrate einer Galaxis mit dem Auftreten Sternsysteme mit einem massiven …
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Mapping the Ancient Milky Way and its Relic Dwarf Galaxies
… observations difficult. Fortunately, the Milky Way hosts populations of ancient, “metal-poor" stars and satellite dwarf galaxies that function as nearby time capsules for investigations of early star formation, galaxy formation, and chemical evolution. The study of these objects is known …
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The stellar halos of Milky Way type galaxies in the EAGLE simulations
… the results of a study into the stellar halos of Milky Way (MW) type galaxies in the EAGLE simulations. Analysis was primarily carried out on two data sets from the EAGLE simulations; one set of 352 galaxies (from the `Reference' model) and 9 higher resolution galaxies (from a `recalibrated' …
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Gravitational Lensing in the Solar Neighbourhood and Towards the Milky Way Bulge
This thesis is concerned with looking for and characterizing microlensing events in two places that are relatively 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 …
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Star Formation History of the Milky Way Galaxy Disk Using a Hierarchical Model
… the universe's age or that of our Galaxy – the Milky Way, to understand how the universe evolved to its current state. First, the Galactic population must be studied to understand the universe. A well-grounded way to understand the Galactic population is to learn about the white dwarfs (WDs) …
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Investigating Interstellar dust in the Milky Way through X-ray scattering and absorption
… and large-scale spatial distribution within the Milky Way—remain uncertain. The aim of this thesis is to use X-ray absorption and scattering as complementary probes to investigate the nature of interstellar dust and derive accurate geometry-based distances to Galactic structures. The first part …
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Chemo-kinematic constraints on Milky Way models from the spectroscopic surveys SEGUE & RAVE
The Milky Way is only one out of billions of galaxies in the universe. However, it is a special galaxy because it allows to explore the main mechanisms involved in its evolution and formation history by unpicking the system star-by-star. Especially, the chemical fingerprints of its stars provide …
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Disentangling the chemodynamical history of the Milky Way disc with asteroseismology and spectroscopy
… different time, length, and energy scales. The Milky Way is the ideal test bench for such simulations, because we can observe millions of its individual stars whose kinematics and chemical composition are records of the evolution of our Galaxy. Thanks to the advent of multi-object spectroscopic …
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The Legacy of the First Galaxies: Exploring Ancient Stars in the Milky Way
… of every galaxy we see today, including the Milky Way. Ever since, for the last 13 billion years, the Milky Way has grown through galaxy mergers. Several of these mergers were with other similarly-sized galaxies and possibly a hundred of these mergers were with small dwarf galaxies. The …
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Unveiling the History and Nature of the Milky Way with Galactic Surveys and Numerical Simulations
The galaxy within which we reside, the Milky Way, offers perhaps the highest fidelity training ground for models of galaxy formation, providing insights into its history of formation and evolution on a star-by-star basis. Such insights are only truly useful for constraining disc galaxy formation …
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