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 91 for “"Galaxy Evolution"”.
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Probing Galaxy Evolution with AKARI
… of these extragalactic fields, was to perform galaxy number counts, the most basic statistical property of galaxy populations. Presented are the counts at 3, 4, 7, 11, 15 and 18 microns. These number counts were compared with published results and galaxy evolution models. These models are …
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Galaxy evolution : near and far
… from interstellar gas is the cornerstone of galaxy evolution. This thesis represents work undertaken in order to characterise the role of cool interstellar gas, and its relation to star formation, in galaxy evolution across cosmic time. In particular, it concentrates on star forming galaxies …
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Galaxy Evolution in the last 9 Billion Years
Ich benutze HST-Bilder des Projektes GEMS und photometrische Rotverschiebungen von COMBO-17, um die Rolle von blauen elliptischen Galaxien (BSGs) und die Entwicklung von scheiben-dominierten Galaxien seit einer Rotverschiebung von z~1 zu untersuchen. Um meine Galaxienauswahl treffen zu können, habe …
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Resolved stellar populations: watching galaxy evolution in real time
… studies help the investigation of the evolution of resolved stellar contents of nearby systems. Hence the properties of these regions represent an archaeological record of the processes that shape a galaxy over cosmic time. So one can interpret from the star formation history the …
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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 …
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Empirical Measurements of Massive Galaxy and Active Galaxy Evolution
Using new wide-area galaxy redshift surveys, we explore the evolutionof the most massive galaxies and the most luminous quasars in the universe over much of cosmic history. Quasars and massive red galaxies both areextremes; the most luminous high redshift quasars likely play a key role in shaping …
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The complex interplay between AGN jet feedback and galaxy evolution
… signatures of AGN jet feedback are found in galaxy clusters, there is growing evidence that these jets are, in fact, largely ubiquitous. Indeed, AGN jets have now been detected in a wide variety of galaxy contexts including dwarfs, Seyferts and ellipticals. Looking towards the future, …
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Galaxy evolution, cosmology and HPC : clustering studies applied to astronomy
… scientific question dealing with the masses of galaxy clusters measured using data from the Planck satellite. An investigation was conducted to explore different techniques and architectures that can be used to accelerate the computation of the TPCF. The code CUTE, was selected in particular to …
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Intergalactic baryon enrichment and implications for galaxy evolution at high redshift
In this thesis we present several surveys of heavy element absorber characteristics at high redshift, gauging properties of diffuse intra- and intergalactic gas in the first several Gyr of the Universe. At z ~ 3.5, we study chemical abundances of Lyman limit systems (LLSs) and evaluate their …
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A Multiwavelength Analysis of the Effect of Cluster Environments on Galaxy Evolution
… to constrain the role of local environment on galaxy evolu- tion. The hot, dense galaxy cluster environment is utilized as a comparative laboratory to galaxies that reside in the less dense field where it is ‘alone’. Within clusters, the buildup of red, passive galaxies is observed to be in …
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The effect of the cosmic web on galaxy evolution in RESOLVE-A
Galaxy environment plays a significant role in galaxy evolution. While most work has focused on the effect of cluster and group environment, large scale structures, such as filaments and voids, may provide additional contributions. Recently, various authors have found correlations between galaxy …
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Comparing Simulations and Observations of Galaxy Evolution: Methods for Constraining the Nature of Stellar Feedback
… is crucial for the development of realistic galaxy models. Equally important is developing effective methods for comparing simulation data against observations to ensure galaxy models which mimic reality and inform us about natural phenomena. This thesis examines the formation and evolution …
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The influences of dark matter halo formation history on black hole growth, circumgalactic gas expulsion and galaxy evolution
… the impact of the properties of the CGM on galaxy evolution, and how the properties of galaxy-CGM ecosystems are fundamentally connected to the assembly histories of their dark matter haloes. I begin by examining the origin of scatter in the relationship between the gas fraction and mass of …
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Insights into the nature of dust attenuation in relation to galaxy evolution from local to cosmic noon galaxies
… advanced statistical techniques to study which galaxy physical parameter is the most important in determining the dust attenuation. We find that the stellar mass leads over all other parameters, with the metallicity and velocity dispersion also being important but less so than the stellar mass. …
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Probing the role of environment and HI content in galaxy evolution: a multi-wavelength study of isolated and paired galaxies
… examination of the impact of the merger-pair galaxy environment on both the neutral hydrogen (Hi ) and mid-infrared (MIR) properties of galaxies in the nearby Universe. Making use of publicly available Hi profiles from the ALFALFA survey I construct the first statistically significant samples …
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Formation of young massive star clusters: a high-resolution multi-wavelength study of intensely star-formation galaxies
… and violent star formation (SF) such as in galaxy mergers and interacting systems. SSCs are thus used as fundamental tools to understand the context of massive SF and galaxy evolution in general. This thesis investigates properties of these young, massive and dense star clusters in a sample …
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Constraining the Major Merging History of Massive Galaxies: A Comprehensive Analysis of Close Pairs and Tidal Features Using Empirical and Simulated Data
Major galaxy merging is a fundamental aspect of the hierarchical structure-growth scenario of the universe, and it is theoretical expected to contribute to several key aspects of galaxy evolution. As such, empirically identifying major mergers is a key methodological step towards assessing the …
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Fast galactic structure finding using graphics processing units
… investigate large scale structure formation and galaxy evolution. Structure finding, that is, the discovery of gravitationally-bound objects such as dark matter halos, is a crucial step in many such simulations. During recent years, advancing computational capacity has lead to halo-finders …
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Fundamental Properties of Galaxy Clusters: A Prelude to Large Scale Sunyaev-Zel'dovich Effect/near-Ir Cluster Surveys
… we study scaling relations between the total galaxy luminosity or number and the cluster binding mass. The origins of such correlations are discussed in terms of a variation of star formation efficiency with cluster mass, various dynamical processes that affect galaxy evolution, and the …
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