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 90 for “"Halos"”.
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Square Halos: A Thesis
The work of Richard W. James explores themes of personal narrative creation and cognitive dissonance as affected by the influences of culture and religion. In first person narrative, this thesis paper discusses the body of work created for his thesis show in March, 2016. Specifically, this paper …
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Understanding dark matter halos with tidal caustics
The products of interactions between galaxies with a high mass ratio and low orbital angular momentum are studied. The interactions scatter the material from the smaller galaxy into structures with distinctive dynamics and morphology, including high local densities and a simple density profile …
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Structure and Local Properties of Dark Matter Halos
… and collisionless–CDM–and its distribution in halos being isothermal and spherical, and well-modeled by an isotopic Maxwell-Boltzmann velocity distribution–the Standard Halo Model (SHM)–prove to be at odds with astrophysical observations. In this thesis I present work towards elucidating two …
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Giant Pair Halos Surrounding Non-Thermal Extragalactic Objects
… zur Ausbildung eines Elektron-Positron-Paarhalos, dessen Teilchenverteilung isotrop ist, falls ein genuegend starkes inter-galaktisches Magnetfeld (|B|> 1 nG) vorhanden ist. In dieser Arbeit wird eine Monte-Carlo Methode angewandt, bei der die Paarhalo-Energie und Winkelverteilungen fuer …
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Die Entstehungsgeschichte der dichten Kerne von CDM-Halos
Über die zentrale Struktur Dunkler Halos gibt es einander widersprechende Aussagen aus numerischen Simulationen und der Beobachtung von galaktischen Rotationskurven. Während in theoretischen Arbeiten stets singuläre Dichteprofile in Zentrumsnähe gefunden wurden, sprechen Beobachtungen für …
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Extracting information from the exteriors of dark matter halos
… of time has been spent studying dark matter halos, the environment around halos and the impact this environment has on structures that pass through it has not been investigated in nearly as much detail. In this thesis we perform several different studies all related to extracting information …
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The structure and spatial distribution of dark matter halos
… the distribution and properties of dark matter halos can be utilized as probes of fundamental questions in modern cosmology. Spatial clustering of dark matter halo carry a wealth of information regarding its evolution history and environment. In particular, I study halo assembly bias, which …
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The formation of enhanced, low-ionization emission in galactic halos
… gas with unusual excitation in the halos of nearby spiral galaxies. This has led to speculation concerning the excitation mechanisms operating at high galactic latitudes, including exotic processes involving nonequilibrium physics, local grain destruction and decaying dark matter. We …
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Statistical properties of Radio Halos and the re-acceleration model
… number of Mpcsized emissions from the ICM, Radio Halos (at the cluster center) and Radio Relics (at the cluster periphery). These sources are due to synchrotron emission from ultra relativistic electrons diffusing through µG turbulent magnetic fields. Radio Halos are the most spectacular evidence …
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Decoding Dark Matter Halos through the Lens of Machine Learning
… outstanding questions in astrophysics. DM halos act as the scaffolding within which galaxies form, but the specific mechanisms through which they influence galaxy evolution are not fully understood, especially at galactic scales. While cosmological simulations and astrophysical surveys have …
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Multicolor analysis of galaxy clusters with radio halos and/or relics
… radio sources called radio relics and radio halos. The relics tend to be found in the peripheral regions of galaxy clusters while halos tend to be located at the central regions. These two types of sources share many of their characteristics but some of their key difference is radio …
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Global modeling of non-axisymmetric disruptions and halos currents in tokamaks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1997.
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The stellar halos of Milky Way type galaxies in the EAGLE simulations
… presents 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 …
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Phase-Space Distributions of Galactic Dark Matter Halos and Implications for Detection
… work focuses on models of galactic dark matter halos and observational prospects. We investigate the impact of careful computation of the phase-space density and velocity distribution of weakly-interacting massive particles, a major class of dark matter particle candidates, in the Milky Way. In …
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Colliding Galaxies: Global Star Formation and the Creation of Hot Galactic Halos
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-13T01:53:44Z No. of bitstreams: 1 hearn.PDF: 7254824 bytes, checksum: 81c5c429040704b62a668197879274e2 (MD5)
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Stellar Halos: modelling formation in the L-Galaxies 2020 semi-analytic model
… 2020 semi-analytic model simulates the stellar halos of galaxies and the intracluster stellar (ICS) components of galaxy clusters. Two galaxy disruption models were tested, namely instantaneous disruption and gradual disruption. Furthermore, two stellar halo profiles were applied to the …
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Characterization of the physical properties of massive dark matter halos from magnification bias
Esta tesis explora en profundidad el sesgo de magnificación utilizando galaxias submilimétricas (SMGs, por sus siglas en inglés) como fuentes de fondo para estudiar los perfiles de densidad de masa de diversos tipos de lentes, incluyendo cuásares, galaxias y cúmulos de galaxias. La metodología se …
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The Orbital Structure of Galaxies and Dark Matter Halos in N-Body Simulations
… all realistic mass ratios between dark matter halos and disk galaxies and that deviations from circular orbits cannot play a decisive role. In the second part we focus on the formation of ellipticals through mergers of disk galaxies. We classify the complex orbital structure in a sample of 150 …
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The structure and evolution of dark matter halos and their implications for cosmology
… is a study of how the properties of dark matter halos can be used to probe fundamental questions in cosmology. Similar to the inner regions of a halo the outer density profiles of the dark matter halo carry a wealth of information regarding its formation epoch, accretion history and environment. …
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A study of the absorption characteristics of gaseous galaxy halos in the local Universe
… extent and physical conditions of gaseous galaxy halos in the local Universe. In the first part of the thesis we use HST /STIS ultraviolet spectra of more than 40 extragalactic background sources to statistically analyze the absorption properties of the HVCs in the Galactic halo. We determine …
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