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 78 for “"Galaxy formation"”.
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Towards AMR Simulations of Galaxy Formation
… I present the implementation of a sub-grid star formation recipe in FLASH and find strong differences in the way the two codes model pressure laws. I extend the work in chapter 8 by implementing a kinetic supernova feedback mechanism in FLASH and contrasting it with the results from the GADGET-2 …
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Connecting simulations and observations in galaxy formation studies
… in order to obtain a consistent picture of galaxy formation and evolution. On the other hand, hydrodynamical simulations of galaxy formation in cosmological context are able to follow the evolution of a galaxy along cosmic time, taking into account both external processes such as mergers, …
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Simulations of Galaxy Formation and Large Scale Structure
Galaxy formation is one of the most fascinating topics of modern cosmology. Since time immemorial, people have desired to understand the origin, motion and evolution of planets, stars and, more recently, galaxies and the Universe as a whole. Great advances in astronomy always have had impact on …
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The role of obscured activity in galaxy formation
In this thesis I investigate the formation and evolution of the galaxies that eventually form the colour-magnitude relation (CMR) in local galaxy clusters. I survey galaxies that lie on the CMR in nine massive clusters at z~0.2, environments in which the build-up of the faint end of the CMR is …
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Understanding massive disk galaxy formation through resolved stellar populations
… populations to improve our understanding of galaxy formation and evolution. In the first part we improve a method for metallicity determination of faint old stellar systems, in the second and third part we analyze the individual history of six nearby disk galaxies outside the Local Group. A …
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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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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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Studying galaxy formation through Lyman alpha in emission and absorption
Galaxy formation is one of the central problems of Physical Cosmology. Neutral hydrogen plays an important role, linking the collapse of cooling gas into haloes with the formation of stars. Lyman alpha, hydrogen’s strongest spectral line, can directly probe neutral hydrogen in the high redshift …
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Numerical Simulations of Galaxy Formation During the Epoch of Reionization
… considers various topics and open questions in galaxy formation during the epoch of reionization and presents multiple new computational techniques developed specifically to study this era. This work naturally divides into two main sections: 1) The formation of the first massive black holes and …
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The Influence of Dark and Ordinary Matter Physics on Galaxy Formation
… the largest scales, with an emphasis on galaxy formation. In particular, using analytic and numerical minimization methods we show that if DM is charged, collective plasma processes may dominate momentum exchange over direct, short-range particle collisions. Using cosmological …
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Numerically modeling the evolution of dust grains in galaxy formation simulations
… of various models for dust physics suited for galaxy formation simulations. I begin by introducing a model to evolve the spatial distribution of dust in galaxies, with dust treated as a passive scalar advected according to hydrodynamic flow. This model accounts for processes that affect the …
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On the evolution of gaseous haloes in cosmological simulations of galaxy formation
… and clumps, leading to more widespread star formation. In the hot halo there is a notable boost in turbulent velocities, leading to a doubling of non-thermal pressure support. With the FABLE suite, I studied how the hydrostatic mass bias and turbulent pressure support level in galaxy clusters …
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Modelling star formation and stellar feedback in numerical simulations of galaxy formation
… of the complex baryonic physics that regulate galaxy formation. Any theory of star formation in galaxies must encompass the radiative cooling of gas into dark matter haloes, the formation of a turbulent, multiphase interstellar medium (ISM), the efficiency with which molecular gas is able to …
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A new twist on black holes: the role of black hole spin in galaxy formation.
… GALFORM semi-analytic model which simulates the formation and evolution of galaxies in a cold dark matter (CDM) universe. The BH and galaxy formation models are coupled: during the evolution of the host galaxy, hot and cold gas are added to the BH by flows triggered by halo gas cooling, disc …
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The Impact of AGN Feedback on Galaxy Formation in Gas-Rich Mergers at z∼1-2
This thesis studies gas-rich galaxy mergers at redshifts of z ∼ 1-2 using numerical simulations, with a particular focus on the effect of feedback from active galactic nuclei (AGNs). In total, 16 galaxy mergers at redshifts z = 1 and z = 2 were modeled using the simulation codes KETJU and GADGET-3. …
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Evolution of Galaxies - Star Formation Histories in Nearby Spheroids
This thesis is about an investigation into the formation of spheroidal type galaxies. The investigation began with modelling studies of early-type galaxies and spiral bulges (SBs). From galaxy formation modelling studies led by experiments with a sample galaxy, some results were obtained; nonsolar …
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Chemodynamical Adaptive Mesh Refinement Simulations of Disk Galaxies
… studies; using numerical simulations of galaxy formation in a cosmological context. The first of these projects involves the simulation of a suite of galaxies in loose group and field environments. This suite of galaxies is used to compare properties such as the metallicity gradients and …
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Formation of the first galaxies under stellar feedback
… feedback is a crucial ingredient for modeling galaxy formation, especially for the first galaxies, which are susceptible to stellar feedback due to their shallow potential wells. In this thesis I have investigated the impact of stellar feedback from the first generation of metal-free massive …
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Galaxy clusters as astrophysical laboratories and probes of cosmology
Galaxy clusters are the most recent of cosmological structures to have formed by the present time in the currently favoured hierarchical scenario of structure formation and are widely regarded as powerful probes of cosmology and galaxy formation physics alike. Over the past few years, it became …
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