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.
Results
Showing 1 to 20 of 21 for “"dwarf galaxy"”.
-
Environmental Influences On Dwarf Galaxy Evolution: The Group Environment
Galaxy groups are a rich source of information concerning galaxy evolution as they represent a fundamental link between individual galaxies and large scale structures. Nearby groups probe the low end of the galaxy mass function for the dwarf systems that constitute the most numerous extragalactic …
-
Structural and Photometric Properties of Extragalactic Stellar Spheroids
After an overview of the science of galaxy morphology, a new classification for galactic form, based upon the Yerkes system, is presented. This classification scheme is then applied to the study of the role of environment in determining the nature of galaxy populations. By examining the …
-
Characterising radio sources in the Small Magellanic Cloud using citizen science and optical spectroscopy
… of radio sources within and beyond the nearby dwarf galaxy. With radio interfer-ometers' ever-increasing sensitivity and resolution, greater source populations will be discovered. Two regions of the SMC dwarf galaxy were observed using MeerKAT, with 10873 radio sources identified across them. …
-
Chemical abundance analysis of HE 2324-0215, an r-process-enhanced metal-poor star
… the star suggest that HE 2324-0215 formed in a dwarf galaxy which was later accreted and became part of the Milky Way.
-
Neutral Hydrogen in Local Group Dwarf Galaxies
The gas content of the faintest and lowest mass dwarf galaxies provide means to study the evolution of these unique objects. The evolutionary histories of low mass dwarf galaxies are interesting in their own right, but may also provide insight into fundamental cosmological problems. These include …
-
Deep HI observations of nearby late-type galaxies
… Hi arm connecting the three galaxies to the dwarf galaxy NGC 2976. These observations offer enough resolution to map the structure of the arm, and reveal a complex of small clouds filling the space between the arm and the Hi forming “main body” of the interacting galaxies. Using a tilted-ring …
-
Deep HI observations of nearby late-type galaxies
… Hi arm connecting the three galaxies to the dwarf galaxy NGC 2976. These observations offer enough resolution to map the structure of the arm, and reveal a complex of small clouds filling the space between the arm and the Hi forming “main body” of the interacting galaxies. Using a tilted-ring …
-
A tale of two particles
… damping, it was the CMB of light, it was the dwarf galaxy of darkness, it was the largest of cosmic scales, it was the smallest of Milky Way subhalos, we had multiple nonminimally coupled inflatons before us, we had inelastically selfinteracting dark matter before us, we were all going direct …
-
HI survey of local group dwarf galaxies
This thesis investigates the HI properties of 3 dwarf irregular galaxies and one blue compact dwarf galaxy of the Local Group. The data set of each dwarf irregular galaxy was obtained with the Karoo Array Telescope (KAT-7) while the blue compact dwarf was observed with the Dominion Radio …
-
Understanding the Milky Way with Stars
… growth, the most plausible theory behind galaxy 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 …
-
Accreted Globular Clusters in External Galaxies: Why Adaptive Dynamics won’t work
Many astrophysical and galaxy-scale cosmological problems require a well-determined gravitational potential. Globular clusters (GCs) surrounding galaxies can be used as dynamical tracers of the luminous and dark matter distribution at large (kpc) scales. This M.Sc. project investigates - by means …
-
Nuclear and particle interactions to multi-messenger signals: Core-collapse supernovae
… star underwent core collapse in a neighboring dwarf galaxy, whose light and neutrinos reached Earth in 1987. Supernova 1987A was observed optically but was also observed through roughly two dozen neutrinos. Modern instruments have the ability to measure electromagnetic signatures in more …
-
Dwarf Galaxies in a Cosmological Context: A Testbench for Galaxy Modeling
… code as an analog to local low-luminosity dwarf irregular and dwarf spheroidal galaxies. The primary goals of this study are to investigate the roles of reionization and supernova feedback in determining the star-formation histories of low-mass dwarf galaxies and to explore the effect of …
-
Starbursts in extragalactic giant H II regions
… waves, and through the interaction of the dwarf galaxy NGC 5195, but require follow-up observations of ionized gas movements via optical spectroscopy for further confirmation. We port this analysis to nearby barred spiral galaxy M83 to perform an in-depth analysis of its top 3 H II regions …
-
Formation and dynamics of the Galactic disc and halo
… and the satellites are all components of the Galaxy's dynamical system which are able to interact to create, perturb and destroy substructure. By using tailored and cosmological simulations, this substructure can be modelled and interpreted to learn about the formation and past evolution of …
-
Gas in Void Galaxies
… 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 of cosmological structure formation. We investigate the neutral hydrogen …
-
Galaxy-Scale Signatures of Screened Modified Gravities
… 3, and 4 present original research regarding two galaxy-scale signatures of screened modified gravity: 'upturns' in galaxy rotation curves and asymmetries in stellar streams. If a galaxy is partially screened, it will have a 'screening radius', within which the fifth force is suppressed. Outside …
-
Search for Ultra-faint Milky Way Satellites
… new low-luminosity Milky Way companions i.e. dwarf spheroidal galaxies and star clusters from the Sloan Digital Sky Survey, Dark Energy Survey, and the Stromlo Milky Way Satellite survey project: PegasusIII, Horologium II, and Kim 1–3. Pegasus III is an ultra-faint outer halo dwarf satellite …
-
Search for Ultra-faint Milky Way Satellites
… new low-luminosity Milky Way companions i.e. dwarf spheroidal galaxies and star clusters from the Sloan Digital Sky Survey, Dark Energy Survey, and the Stromlo Milky Way Satellite survey project: PegasusIII, Horologium II, and Kim 1–3. Pegasus III is an ultra-faint outer halo dwarf satellite …
-
Resolved stellar populations: watching galaxy evolution in real time
… record of the processes that shape a galaxy over cosmic time. So one can interpret from the star formation history the evolution of the star formation rate throughout the galaxy and the evolution of the mass and metallicity distributions. The system that has been studied in this …
Page 1 of 2