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 578 for “"Galaxies"”.
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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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Emission Line Galaxies from CADIS : High Redshift Lyman-Alpha Galaxies and Metal Poor Galaxies at Medium Redshift
In this thesis, metal poor galaxies at 0.4<z<0.7 and Ly-alpha galaxies at z>4.7 have been searched for and investigated in a sample of 600 faint emission line galaxies from four fields of the Calar Alto Deep Imaging Survey (CADIS). Employing an imaging Fabry-Perot interferometer, CADIS detects …
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Stability of flat galaxies
In this thesis we investigate the existence and properties of stationary solutions of the flat Vlasov-Poisson system. This system of partial differential equations can be used as a model of extremely flat astronomical objects and is a combination between the two-dimensional motion of particles and …
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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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Metallicity correlations in galaxies
… oxygen abundances in the interstellar medium of galaxies in both the local and high-redshift Universe. The two-point correlation function is a useful tool for extracting information from the 2D metallicity maps that integral field spectroscopy produces. Using the current integrated field unit …
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Metallicity correlations in galaxies
… oxygen abundances in the interstellar medium of galaxies in both the local and high-redshift Universe. The two-point correlation function is a useful tool for extracting information from the 2D metallicity maps that integral field spectroscopy produces. Using the current integrated field unit …
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Luminous red galaxies in simulations
… of the Universe using age-dating of Luminous Red Galaxies (LRGs).Assuming stars in LRGs form at the same time, age-dating of two populations of LRGs at different redshifts can provide an estimate of the time difference associated with the corresponding redshift interval (dt/dz). This gives a …
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The evolution of radio galaxies
Radio galaxies with extended lobes are believed to interact strongly with their environment. In this thesis, I investigate the evolution of radio galaxies with different properties and track them through the cosmological ages.<br/><br/>In Chapters 2 and 3, I perform a ”Monte-Carlo-based” population …
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Evolution of Galaxies in Clusters
In dieser Doktorarbeit studiere ich die Entstehung und Entwicklung von Galaxien in Galaxienhaufen sowohl theoretisch als auch unter Einbeziehung von Beobachtungsdaten. Diese Doktorarbeit gliedert sich in zwei Teile: Einem theoretischen Teil schliesst sich eine Datenanalyse an. Im ersten Kapitel …
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Dark Matter in Spiral Galaxies
… five high surface brightness, late type spiral galaxies NGC 3810, NGC 3893, NGC 4254, NGC 5676 and NGC 6643, which were studied with the aim to quantify the luminous-to-dark matter ratio inside their optical radii. In order to meet this goal, the galaxies' morphology and gas kinematics have been …
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The Jets in Radio Galaxies
This thesis describes two studies of extragalactic radio sources at high resolution and sensitivity. Most of the well-known facts about radio sources come from low-resolution imaging, despite the fact that much of the interesting physics (that of the jets and hotspots) occurs on scales that are …
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Clustering studies of radio-selected galaxies
We investigate the clustering of HI-selected galaxies in the ALFALFA survey and compare results with those obtained for HIPASS. Measurements of the angular correlation function and the inferred 3D-clustering are compared with results from direct spatial-correlation measurements. We are able to …
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Classification of galaxies using fractal dimensions
The classification of galaxies is morphological. Shapes of the galaxies range from the very simple (e.g. elliptical galaxies) to the highly complex (e.g. irregular galaxies). Analyzing a measure of complexity for such shapes could lead to automatic classification. Fractal dimension, a quantity …
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Evolution of galaxies in compact groups
… new observations of the complete sample of galaxies in Hickson Compact Groups and combines these observations with various previous works to attempt to answer some fundamental questions about the nature, history, and dynamical state of these groups. The new data consist of radial velocities …
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The nuclei of bulge-less galaxies
Als Beitrag zur Vervollst?andigung unseres Wissens ?uber Galaxienzentren wurde die Zentral-Region sehr sp?ater (bulge-loser) Spiralgalaxien untersucht. Die besonders hellen (10 6 – 108 L
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The evolution of galaxies and AGN
… current questions regarding the evolution of galaxies and AGN. We first argue that the bright submillimetre number counts may be dominated by obscured AGN rather than ultraluminous starbursts. Through statistical analyses of the ECDFS and WHDF, we show that N_H > 10^22 cm^−2 AGN are typically …
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