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 42 for “"haloes"”.
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Galactic Stellar Haloes in the CDM Model
This thesis studies galactic stellar haloes built up through the tidal disruption of accreted dwarf galaxies. Numerical simulations are used to explore this process in the context of the Cold Dark Matter model of cosmological structure formation. We predict the properties of stellar structures that …
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Stellar Spiral Structures in Realistic Dark Matter Haloes
… structures embedded in realistic dark matter haloes with very high resolution simulations. I first study the impact of the shape of the dark matter haloes. I find that non-adiabatic changes to the dark matter halo shape, commonly found in cosmological simulations due to the assembly history of …
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Satellite dynamics in spiral galaxies with Dark Matter haloes
Diese Doktorarbeit analysiert die dynamische Evolution der Satelliten-Galaxien in einer, von einer massiven dunklen Korona (dunkle Materie) umgebenen Spiral-Galaxie. Die Hauptziele sind: (i) die Durchführung einer detaillierten theoretischen Analyse der dynamischen Reibung, d.h. des Prozesses, der …
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The Structure of Dark Matter Haloes in Cosmological Simulations
… shape and density structures of dark matter haloes using very large dark matter simulations, and use smaller, higher-resolution simulations to investigate how the distributions of these properties are changed by the physical processes associated with baryons and galaxy formation. We begin …
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On the evolution of gaseous haloes in cosmological simulations of galaxy formation
The study of gaseous haloes holds the key to understanding gas flows in and out of galaxies, which in turn determines how galaxies form and evolve. However, recent observations have revealed them to be very complex, with the presence of significant amounts of multiphase gas, driven by a range of …
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The influences of dark matter halo formation history on black hole growth, circumgalactic gas expulsion and galaxy evolution
… do not evolve in isolation, but exist in haloes of dark matter and gas, embedded in the large-scale "cosmic web". To build a self-consistent model for how galaxies form and evolve, it is vital to understand how galaxies regulate their formation through interaction with the "circumgalactic …
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Basis Sets in Galactic Dynamics
… for the modelling of realistic galaxies and haloes. Along the way a simple yet under studied spherical double-power model is described that interpolates between the properties of the more famous NFW and Hernquist models. Finally, we turn to an application of the new basis sets: the problem of …
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Understanding the Epoch of Reionization Using Simulations of Lyman-α Emitting Galaxies and 21-cm Emission
… of bright LAEs residing in more massive host haloes with those of fainter LAEs residing in less massive haloes, and how their environments affect the visibility of LAE populations. (ii) how to model the population statistics of LAEs and use them to constrain reionization. I implement a model …
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A new twist on black holes: the role of black hole spin in galaxy formation.
… on environment. We find that quasars inhabit haloes with masses 10^{12} − 10^{13} M⊙. Quasar activity in more massive haloes in suppressed due to AGN feedback. In contrast, radio galaxies occupy the centres of the most massive haloes. Our model represents the first consistent demonstration …
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Patterns of Lithology, Structure, Alteration, Trace Elements, Carbonate Mineralogy, and Stable Isotopes around High-Grade Carlin-type Gold Deposits: Turquoise Ridge Deposit, Getchell District, Nevada
… in Chapter 1 to test for the presence of haloes that can potentially be used as vectoring tools in honing in on high-grade ore zones at the Turquoise Ridge CTGD. Carbonate staining was utilized to determine differences in carbonate mineralogy associated with more reactive and non-reactive …
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Studying galaxy formation through Lyman alpha in emission and absorption
… role, linking the collapse of cooling gas into haloes with the formation of stars. Lyman alpha, hydrogen’s strongest spectral line, can directly probe neutral hydrogen in the high redshift Universe. Lyα can be observed in absorption in Damped Lyman Alpha systems (DLAs): high Hi column density …
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The Ontology of the Venetian Halo in its Italian Context
… artistic innovation of “glass” and “silk” haloes, through artists’ utilisation of contemporaneous industrial practices and their application to halo appearance. Additionally, extant architectural vocabulary is translated and reformulated into internal halo motifs by Venetian and Venetan …
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The THESAN Project: ionizing escape fractions of reionization-era galaxies
… This allows the formation of numerous massive haloes (𝑀 subscript halo ≳ 10¹⁰ M⊙), which are often statistically underrepresented in previous studies but are believed to be important to achieving rapid reionization. We find that low-mass galaxies (𝑀 subscript stars ≲ 10⁷ M⊙) are the main …
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Recognising cryptic alteration surrounding the Mount Isa Copper Deposits: Implications for controls on fluid flow, and mineral exploration
This study investigated cryptic alteration haloes associated with copper mineralisation at Mount Isa, Northwest Queensland, Australia. New insights from hydrothermal alteration were used to constrain aspects of hydrothermal fluid flow and fluid-rock interactions that occurred as part of the …
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Modelling star formation and stellar feedback in numerical simulations of galaxy formation
… the radiative cooling of gas into dark matter haloes, the formation of a turbulent, multiphase interstellar medium (ISM), the efficiency with which molecular gas is able to collapse into cores and ultimately stars, and the subsequent interaction of those stars with the gas through ionizing …
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Fracture reactivation and gold mineralization in the epithermal environment : structural evolution of the Endeavour 42 gold deposit, New South Wales, Australia
… by sericite-quartz ± carbonate alteration haloes, which exhibit consistent geochemical patterns for metals and pathfinder elements, both laterally away from structures, and vertically within the deposit. Au, Ag, As, Hg, Sb, Tl, Cu, Pb, and Zn, all display increasing concentrations towards …
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The Nature of Emission-Line Galaxies in Hierarchical Cosmologies
… emitters are found to avoid massive dark matter haloes, whereas H-band selected galaxies are found in the highest mass haloes. By using mock catalogues, we predict the effectiveness of measuring the large scale structure of the Universe for a range of survey configurations using both galaxy …
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Extreme Stellar Populations in the Universe: Backsplash Dwarf Galaxies and Wandering Stars
… comparison against populations of dark matter haloes in the Via Lactea II (VLII) simulation with known orbital histories. Analysis of VLII provides expectations for this escaped population: they contribute 13 per cent of the galactic population between 300 and 1500 kpc from the Milky Way, and …
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The Origins and Environments of Quasar Absorption Lines in the Sloan Digital Sky Survey
… disks, and virialized gas in extended galaxy haloes. Although progress has been made in observationally differentiating the physical phenomena producing absorption in individual systems, high-resolution spectroscopy has generally been required for such work, and such observations are expensive …
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The petrology of the Kielder sulphide bodies and their wall rocks : district of Prieska, N. Cape, South Africa
… massive sulphides, their disseminated pyritic haloes and the enclosing wall rocks in an area of poor outcrop with extensive calcrete and sand cover and, in places,in situ Karoo Super-group Owyka System varved shales.Geothermometry and geobarometry using garnet-biotite, …
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