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 28 for “"AGN Feedback"”.
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The Impact of AGN Feedback on Galaxy Formation in Gas-Rich Mergers at z∼1-2
… 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. The simulations were performed on the supercomputer Mahti located at the Finnish IT …
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Cosmology with Velocity Dispersion based Counts of Groups and the Effect of AGN Feedback on Host Galaxy Morphology
… investigate the role of active galactic nuclei (AGN) in galaxy evolution. The color bimodality of galaxy populations roughly divides galaxies into two groups: blue, star-forming galaxies, and red, quiescent galaxies. One theory that explains how high-mass, red, non-star-forming galaxies maintain …
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Searching for Extreme-BCG Clusters at 0.2 < z < 1.3
Active galactic nuclei (AGN) feedback is believed to be responsible for counteracting the formation of the classical “cooling flow”, predicted to be associated with most “cool core” clusters of galaxies. Several studies have shown that many phenomena found in galaxy clusters can be neatly explained …
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X-ray Spectroscopy of Cool Core Galaxy Clusters
… indicated much lower levels of cooling rate. AGN feedback is thought to be the most likely energy source to balance radiative cooling, though the energy transport and dissipation mechanisms are still under debate. In this work, I study whether AGN feedback can actually balance radiative …
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Observational Studies of Rare Quasar Outflows: the FeLoBALs
… a process known as active galactic nucleus (AGN) feedback, it can deplete the galaxy's gas reservoir required to produce stars, quenching its star formation rate and thus regulating the host galaxy's evolution. There is a growing body of work studying a rare type of broad absorption line …
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Quasar Outflows: Their Scale, Behavior and Influence in the Host Galaxy
… a major candidate for Active Galactic Nuclei (AGN) feedback, and their capacity to influence the evolution of their host galaxy depends on the mass-flow rate (M) and kinetic luminosity (E) of the outflowing material. Both quantities require measurement of the distance (R) to the outflow from …
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A new twist on black holes: the role of black hole spin in galaxy formation.
… the jet properties of active galactic nuclei (AGN) are a natural consequence of both the accretion rate onto and the spin of the central BH. The model also reproduces the observed luminosity functions (LF) of AGN (optical, soft and hard X-ray, and bolometric) for a wide range of redshifts (0 < …
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A Study of Quasar Outflows: Physical Characteristics and Feedback Effects
… a process known as active galactic nucleus (AGN) feedback, through which the quasar can curtail the formation of stars, regulate the evolution of its host galaxy, and affect its surrounding environment in other ways. One possible mechanism for this process is a quasar's outflow, which can be …
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On the evolution of gaseous haloes in cosmological simulations of galaxy formation
… undergo major mergers and are host to powerful feedback episodes. I found that clusters rarely tend to be in hydrostatic equilibrium for long, with variations being driven by both merger activity and interestingly, at higher redshift, AGN feedback. Such insights could be important for future …
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Quenching of Star Formation in the Local Universe A Comparison of Hydrodynamical Simulations with Spectroscopic Observations
… consequences of Active Galactic Nucleus (AGN) feedback quenching from three state-of-the-art cosmological simulations: EAGLE, Illustris and IllustrisTNG. Our machine learning (ML) classification reveals supermassive black hole mass (MBH) as the most predictive parameter in determining …
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Exploring Galaxy Clusters and Groups with Cosmological Simulations
… processes such as star formation or feedback from supernovae and active galactic nuclei (AGN). In this thesis I present the $\textit{Feedback Acting on Baryons in Large-scale Environments}$ (FABLE) project, a new suite of cosmological hydrodynamical simulations of galaxies, groups and …
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Evolution of Supermassive Black Hole Feedback in Galaxy Clusters
… to the eventual feeding and triggering of feedback from the largest supermassive black holes (SMBHs) residing in them. This cooling and subsequent feedback from these active galactic nuclei (AGN) is the primary driver of the baryon cycle and evolution of the largest, brightest cluster …
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Spatially resolved star formation and quenching: insights from observations and simulations
… mock observations of galaxies from the EAGLE, Magneticum, and IllustrisTNG simulations to match MAGPI observational details including the average point spread function and pixel scale. Overall, there is no agreement in radial trends between MAGPI observations and the simulations, except for …
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Spatially resolved star formation and quenching: insights from observations and simulations
… mock observations of galaxies from the EAGLE, Magneticum, and IllustrisTNG simulations to match MAGPI observational details including the average point spread function and pixel scale. Overall, there is no agreement in radial trends between MAGPI observations and the simulations, except for …
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The influences of dark matter halo formation history on black hole growth, circumgalactic gas expulsion and galaxy evolution
… how galaxies affect their surroundings through feedback processes, 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 …
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Investigating the Environmental Properties of Galaxies in the SDSS-MaNGA Survey
… by a combination of morphological quenching and AGN feedback. Finally, I study the role of galaxy bars in regulating the cirumnuclear and disk star formation in late-type galaxies. I find that barred galaxies have lower star formation in their disks than unbarred galaxies, and that they are more …
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The Influence of Physical Processes in Galaxy Clusters on Observable Cluster Scaling Relations
… and heating from active galactic nuclei (AGN), on cluster mass-observable relations. In particular, we investigate the physical origin of the intrinsic scatter around the best-fit relations by correlating it with measures of cluster structure, dynamical state, and AGN activity. Using a …
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Star formation in unobscured quasars
… in their hosts. We then look for evidence of AGN feedback in broad absorption line (BAL) quasars, as such features are indicative of outflowing material. We find that high-ionization BAL quasars have indistinguishable properties to those of classical quasars. In our second study, which …
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Galaxy clusters as astrophysical laboratories and probes of cosmology
… the most important 'sub-grid' physics, including feedback from supernovae and active galactic nuclei (AGN) has been systematically varied. Via the production of synthetic surveys of the simulations and comparisons with observations, the realism of these state-of-the-art models was explored. At the …
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Black Hole Feedback in New Regimes: Modelling Dwarf Galaxies with Active Galactic Nuclei
… 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 galaxies. Firstly, I perform …
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