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 14 of 14 for “"Galactic evolution"”.
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The galactic evolution ofs-process elements via asymptotic giant branch stars
… the current confusion. Results from stellar evolution models are brought together in order to establish trends of certain parameters as functions of one or two other parameters. Using these parameterizations, we have determined the s-process abundances created by these stars for different …
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Investigating the role of ionised outflows in galactic evolution through spatially resolved spectroscopy
… cosmological simulations of galaxy formation and evolution frequently employ feedback mechanisms from active galactic nuclei (AGN) and supernovae (SNe) to quench star formation in the early stages of massive galaxy formation and to explain the low efficiency of star formation in disk galaxies. A …
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The gas content of luminous compact blue galaxies in the COSMOS field
… they make excellent candidates for studying galactic evolution as a whole. In order to understand how galaxies evolve, we make use of LCBGs to study their gas content as it changes over approximately nine billion years of lookback time. We make use of HI emission line data provided by the …
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On the Distances and Energetics of AGN Outflows
Active galactic nuclei (AGN) ubiquitously show outflows. It is now widely recognized that these outflows are key components in the evolution of super-massive black holes and their host galaxies. As important as these outflows are, we still lack sufficient understanding of their structure and …
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Comprehensive analyses of massive binaries and implications on stellar evolution
… stars (Mini & 8 M☉) bear a tremendous impact on galactic evolution. It became clear in recent decades that the majority of massive stars reside in binary systems. This thesis sets as a goal to quantify the impact of binarity (i.e., the presence of a companion star) on massive stars. For this …
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Star Cluster Formation and Galactic Assembly: from instrumentation, to observations and simulations
… of many fields, serving as test beds for stellar evolution, dynamics, and chemical evolution and acting as tracers of Galactic evolution. Despite their prevalence across astrophysics, many fundamental questions remain. Specifically, how did GCs form and under what conditions? And how did they come …
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Star Cluster Formation and Galactic Assembly: from instrumentation, to observations and simulations
… of many fields, serving as test beds for stellar evolution, dynamics, and chemical evolution and acting as tracers of Galactic evolution. Despite their prevalence across astrophysics, many fundamental questions remain. Specifically, how did GCs form and under what conditions? And how did they come …
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Celestial Paleontology: The Legacy of Dying Stars
… formation as well as the energetic and chemical evolution of galaxies and the universe as a whole. Dying stars are thought to be the source of all of the nuclei heavier than iron in the universe, as well as more complex molecules, such as carbon chains, which form the backbone of life as we know …
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The Active Phases of a Galaxy in the JWST and Euclid Era: From Radio Jets and Multiphase Outflows to Mergers
… the key processes that regulate the growth and evolution of galaxies, focusing on the role of active galactic nuclei (AGNs). AGN feedback, in the form of energy flows and radio jets, is a fundamental mechanism that regulates star formation, redistributes gas and dust, and shapes the structure of …
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Reverberation Mapping of Supermassive Black Holes using Machine Learning
… at the centers of galaxies, known as active galactic nuclei (AGN), offer a unique window into the physics of accretion and feedback that shape galactic evolution. Yet, the small spatial scales of these regions remain inaccessible to direct imaging. Reverberation mapping circumvents this …
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Applications of X-ray Instrumentation for Dark Matter Searches with Cosmic-ray Antiparticles
… particles, which are themselves agents of Galactic evolution, provide unparalleled probes of the Galactic environment and dynamics. This dissertation describes two complementary approaches to the interconnected worlds of indirect dark matter detection and cosmic-ray physics: first, …
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Chemical and kinematical evolution in nearby dwarf spheroidal galaxies
… contradiction to the properties of stars in the Galactic halo. Further, yet unsolved, puzzles include the missing satellite problem, the influence of feedback and reionization, and the nature of dark matter. How then do the dSphs form, to what extent do they contribute to the build-up of massive …
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Disentangling the chemodynamical history of the Milky Way disc with asteroseismology and spectroscopy
… and chemical composition are records of the evolution of our Galaxy. Thanks to the advent of multi-object spectroscopic surveys, we can systematically study stellar populations in a much larger volume of the Milky Way. While the wealth of new data will certainly revolutionise our picture of …