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 26 for “"galaxy formation and evolution"”.
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Early Type Galaxies And Reliable Galaxy Cluster Selection
… directly encapsulate the history of structure formation. Thus, determining the mass distribution of clusters as a function of redshift enables fundamental tests of this structure formation process. My projects have initially been motivated by an intellectual inquiry into how we can effectively …
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The FORS Deep Field Spectroscopic Survey
The determination of the properties of galaxy populations at different redshifts provides important constraints on current models of galaxy formation and evolution. In order to investigate this evolutionary process systematically, we obtained high S/N spectra for 265 galaxies at redshifts up to 5.0 …
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The clustering of galaxies in hierarchical galaxy formation models
Galaxy clustering encodes information about the values of cosmological parameters and also about the physical processes behind galaxy formation and evolution. The GALFORM semi-analytical model is the theoretical approach we used to model galaxy formation. We start by studying the luminosity …
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Connecting simulations and observations in galaxy formation studies
Observational and computational extragalactic astrophysics are two fields of research that study a similar subject from different perspectives. Observational extragalactic astrophysics aims, by recovering the spectral energy distribution of galaxies at different wavelengths, to reliably measure …
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Evolution of the Stellar Mass Density of Galaxies Since Redshift 1.0
… masses can be estimated also at higher redshifts and therefore with reduced angular resolutions, when observing with ground based instruments. For a sample of 25000 galaxies drawn from the COMBO-17 survey stellar masses are estimated. For this purpose a method is used that is based on the COMBO-17 …
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Star formation in the bars of nearby galaxies
Aims: In this study, we quantify the star formation activity in bars as a function of the host stellar mass and the morphological type. We use a sample of 70 barred spiral galaxies in the nearby universe taken from the Spitzer Survey of Stellar Structure in Galaxies (S⁴G). The data are combined …
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Investigating bursty star formation and interstellar medium conditions in low-mass galaxies
… are the most abundant systems in the universe, and are the progenitors of present-day Milky Way-mass galaxies. Compared to massive galaxies, low-mass galaxies exhibit higher specific star formation rates (sSFR), and have shallower gravitational potential wells; therefore the effects of feedback …
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The Scatter Dependence of the Spatially-Resolved Star Formation Main Sequence Relation
The scatter of the spatially-resolved star formation main sequence (SFMS) is investigated in order to reveal signatures about processes of galaxy formation and evolution. We have assembled a sample of 355 nearby galaxies with spatially-resolved Hα and mid-infrared fluxes from the Survey for Ionized …
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The Andromeda Optical and Infrared Disk Survey
… distributions of galaxies inform us about a galaxy’s stellar populations and interstellar medium, revealing stories of galaxy formation and evolution. How we interpret this light depends in part on our proximity to the galaxy. For nearby galaxies, detailed star formation histories can be …
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Bulges and Disks in the Nearby Universe: Applications to Evolution and Formation of Galaxies
… Vacouleurs, Sersic, de Vacouleurs + Exponential, and Sersic + Exponential fits of ~7 x 10^5 spectroscopically selected galaxies drawn from the Sloan Digital Sky Survey (SDSS) Data Release 7. Fits are performed for the SDSS r-band utilizing the fitting routine Galfit and analysis pipeline PyMorph. …
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Cosmological Simulations with Resolved Supermassive Black Hole Binary Dynamics and Accretion
… thesis investigates the properties of galaxies and supermassive black hole (SMBH) binaries in cosmological zoom-in simulations. The focus of the study is twofold: first, the agreement between simulated galaxies and observed scaling relations is assessed, followed by an analysis of the impact of …
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Hunting Supermassive Black Holes in the Early Universe
… hold the essential ingredient into understanding the galaxy formation and evolution across cosmic time. The physical properties of SMBH are found to tightly correlated with host galaxies in local universe. Whether such relationship apply in the early universe remains debated, observation …
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Galaxy Formation in the Lambda-Cold Dark Matter Cosmology
… effects of the various physical processes behind galaxy formation and evolution in hierarchical cosmologies by using semi-analytical modelling. I use the Durham semi-analytical model GALFORM. I first test the GALFORM model predictions using observations from the Sloan Digital Sky Survey (SDSS). I …
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Spatially-resolved studies of nearby star-forming galaxies
… star-forming galaxies are essential to understand various physical and chemical phenomena at play in the interstellar medium in the galaxies, and consequently to obtain a comprehensive picture of galaxy formation and evolution. In this thesis, I perform spatially-resolved analyses of chemical …
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Bright Z ~ 3 Lyman Break Galaxies in Deep Wide Field Surveys
… to observe a lensed high-redshift star-forming galaxy (J0900+2234) at z = 2.03. With the high S/N near-IR spectroscopic observations, I reveal the detailed physical properties of this high-redshift galaxy, including SFR, metallicity, dust extinction, dynamical mass, and electron number density. …
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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 …
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Black Hole Feedback in New Regimes: Modelling Dwarf Galaxies with Active Galactic Nuclei
Contrary to the standard lore, there is mounting observational evidence that feedback from active galactic nuclei (AGN) may also play a role at the low-mass end of the galaxy population. In this thesis, I explore that possibility employing both isolated and cosmological simulations of dwarf …
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Regulating and Quenching Star Formation in Galaxies across the Cosmic Epochs
… PhD thesis uncovers the mechanisms regulating and quenching star formation in galaxies from cosmic dawn to the present. Based on optical spectroscopy of 10,000 local galaxies from the MaNGA survey, I report the discovery of a stellar Fundamental Metallicity Relation, a smooth relation between …
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Investigating the role of ionised outflows in galactic evolution through spatially resolved spectroscopy
How feedback mechanisms trigger, regulate and suppress star formation in galaxies remains one of the main questions in astronomy today. Theoretical models and cosmological simulations of galaxy formation and evolution frequently employ feedback mechanisms from active galactic nuclei (AGN) and …
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Modeling Astrophysical and Large-Scale Structure Signatures in Axion Cosmologies
The quest to understand the fundamental nature of dark matter (DM) remains a challenge in contemporary physics. This thesis aims at elucidating astrophysical and cosmological imprints of fuzzy dark matter (FDM), a promising class of models which find ample motivation within theories of particle …
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