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 25 for “"Disk Galaxies"”.
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The Universal Rotation Curve of Disk Galaxies
… that can predict the rotation curve (RC) of any disk galaxy and, through the relations used to define it, directly correlate stellar properties to dark halo parameters. By examining these dark-luminous relations for different galaxy morphologies, we can study how dark halo shapes change with …
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The distributions of stellar remnants in disk galaxies
… on the distribution of supernova remnants in galaxies. It consists of 3 parts, the identification of runaway stars in galaxies and then the modelling of the expected distribution of these stars around a galaxy and their expected dispersion over time. The first part of the thesis is a thorough …
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Chemodynamical Adaptive Mesh Refinement Simulations of Disk Galaxies
… projects involves the simulation of a suite of galaxies in loose group and field environments. This suite of galaxies is used to compare properties such as the metallicity gradients and morphology to determine if systematic differences are apparent as a function of subtle environmental …
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Supernova-driven turbulence and magnetic field amplification in disk galaxies
… effect on magnetic field amplification in spiral galaxies is still poorly understood. Analytical models based on the uncorrelated-ensemble approach predicted that any created field will be expelled from the disk before a significant amplification can occur. By means of direct simulations of …
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A theoretical study of the stability of disk galaxies and planetary rings
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1985.
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Struktur und Dynamik wechselwirkender Galaxien
… to the ``merger hypothesis'', elliptical galaxies form by mergers of spiral galaxies. To test this hypothesis, simulations of collisionless mergers between disk galaxies with different mass ratios and orbital geometries were performed. Every merger remnant was investigated with respect to …
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The Orbital Structure of Galaxies and Dark Matter Halos in N-Body Simulations
… this work two different formation mechanism of galaxies in N-body simulations. Under the assumption that particles in a spherical dark matter halo move on circular orbits we can predict the amount of contraction of the dark matter halo during the slow formation of the disk with an adiabatic …
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The effect of Adiabatic compression on the fundamental plane of bulges
… compression. Bulge compression takes place as disks grow around bulges. When the bulge is compressed the velocity dispersion of the bulge increases, according to the Virial theorem. This project has found the physical parameters of the uncompressed classical bulges from calculation and …
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Multi-dimensional analysis of the chemical and physical properties of spiral galaxies
The PPAK Integral Field Spectroscopy (IFS) Nearby Galaxies Survey: PINGS, a 2-dimensional spectroscopic mosaicking of 17 nearby disk galaxies in the optical wavelength range. This project represents the first attempt to obtain continuous coverage spectra of the whole surface of a galaxy in the …
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Understanding massive disk galaxy formation through resolved stellar populations
… we analyze the individual history of six nearby disk galaxies outside the Local Group. A New Calibration of the Color Metallicity Relation of Red Giants for HST data: It is well known, that the color distribution of stars on the the Red Giant Branch (RGB) can be used to determine metallicities of …
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A pipeline for the analysis of stellar spectra
… on to the history of our galaxy and other disk galaxies. In this thesis, we present the development of a new pipeline, the STellAR Parameter AND Abundances pipeline (STARPANDA), which is able to rapidly derive stellar parameters, CNO abundances and other elemental abundances by utilising …
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The Environment Of Galaxies And Groups Of Galaxies
… of large scale structure and individual galaxies - to explore the underlying physics governing the formation and evolution of groups of galaxies, and the role of environment in generating polar structures around disk galaxies. Using phenomenological models of baryonic physics imposed upon …
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Lenticular galaxies - the one in the middle
The lenticular (S0) galaxies introduced by Hubble (1936) as a morphological transition class between elliptical and early-type spiral galaxies, which have the most massive bulges among disk galaxies, may have formed in several different ways as suggested by theoretical and numerical simulation …
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Gas in Void Galaxies
Void galaxies, residing within the deepest underdensities of the Cosmic Web, present an ideal population for the study of galaxy formation and evolution in an environment undisturbed by the complex processes modifying galaxies in clusters and groups, and provide an observational test for theories …
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Probing for optical and HI diffuse gas in MHONGOOSE galaxy UGCA 250
… gas (eDIG) has been observed in external spiral galaxies as well as the Milky Way and is distinguished by its emission-line ratios and its rotational velocity lag with respect to the galactic disk. Similarly, there is a wealth of observational evidence for extraplanar gas in the form of neutral …
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Shocks and Metallicity Gradients in Normal Star-Forming Galaxies
… This thesis explores gas flows in local galaxies by studying metallicity gradients and galactic- scale outflows in normal star-forming galaxies. This is made possible by new integral field spectroscopy data that provide simultaneously spatial and spectral information of galaxies. First, I …
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Basis Sets in Galactic Dynamics
… wide attention in the perturbation theory of disk galaxies. This thesis begins by discussing the theory behind such basis sets, and the context of their applications. Some introductory results are presented, deriving the possible functional forms that basis sets can take, and identifying the …
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Origin and Properties of Elliptical Galaxies in a Hierarchical Universe
The formation of elliptical galaxies by merging galaxies has been investigated adopting three different paths. First, we confirm that the frequency of major merger events predicted by hierarchical models is in fair agreement with observations. Second, the generally assumed initial conditions used …
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