Dissertations / Theses on the topic 'Galaxy feedback'
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Bielby, Richard. "Galaxy clustering and feedback." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2344/.
Full textShabala, Stanislav. "AGN feedback in galaxy evolution." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612309.
Full textCreasey, Peter Edward. "Simulating supernova feedback in galaxy disks." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/6349/.
Full textPike, Simon Robert. "Simulations of galaxy clusters with AGN feedback." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/simulations-of-galaxy-clusters-with-agn-feedback(02c5a9f6-03ad-4c80-9e7c-832db83998d8).html.
Full textBieri, Rebekka. "The Role of AGN Feedback in Galaxy Formation." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066292/document.
Full textSupermassive black holes (SMBHs) are known to reside in the centres of most large galaxies. The masses of these SMBHs are known to correlate with large-scale properties of the host galaxy suggesting that the growth of the BHs and large-scale structures are tightly linked. A natural explanation for the observed correlation is to invoke a self-regulated mechanism involving feedback from Active Galactic Nuclei (AGN). The focus of this thesis is on the interactions between AGN outflows and the ISM and how the feedback impacts the host galaxy. In particular, it focuses on the two possible mechanism of outflows, namely, outflows related to AGN jets and outflows produced by AGN radiation. High resolution, galaxy scale hydrodynamical simulations of jet-driven feedback have shown that AGN activity can over-pressurise dense star-formation regions of galaxies and thus enhance star formation, leading to a positive feedback effect. I propose, that such AGN-induced pressure-regulated star formation may also be a possible explanation of the high star formation rates recently found in the high-redshift Universe. In order to study in more detail the effects of over-pressurisation of the galaxy, I have performed a large set of isolated disc simulations with varying gas-richness in the galaxy. I found that even moderate levels of over-pressurisation of the galaxy boosts the global star formation rate by an order of magnitude. Additionally, stable discs turn unstable which leads to significant fragmentation of the gas content of the galaxy, similar to what is observed in high-redshift galaxies. The observed increase in the star formation rate of the galaxy is in line with theoretical predictions. I have also studied in detail how radiation emitted from a thin accretion disc surrounding the BH effectively couples to the surrounding ISM and drives a large scale wind. Quasar activity is typically triggered by extreme episodes of gas accretion onto the SMBH, in particular in high-redshift galaxies. The photons emitted by a quasar eventually couple to the gas and drive large scale winds. In most hydrodynamical simulations, quasar feedback is approximated as a local thermal energy deposit within a few resolution elements, where the efficiency of the coupling between radiation of the gas is represented by a single parameter tuned to match global observations. In reality, this parameter conceals various physical processes that are not yet fully un- derstood as they rely on a number of assumptions about, for instance, the absorption of photons, mean free paths, optical depths, and shielding. To study the coupling between the photons and the gas I simulated the photon propagation using radiation-hydrodynamical equations (RHD), which describe the emission, absorption and propagation of photons with the gas and dust. Such an approach is critical for a better understanding of the coupling between the radiation and gas and how hydrodynamical sub-grid models can be improved in light of these results
Pearson, Richard John. "Mass estimation, dynamics and feedback in galaxy groups." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5676/.
Full textHuarte-Espinosa, Martín. "Modelling feedback and magnetic fields in radio galaxy evolution." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609093.
Full textStinson, Gregory. "Supernova feedback in smoothed particle hydrodynamics simulations of galaxy formation /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/5428.
Full textCollet, Cédric. "Role of AGN feedback in galaxy evolution at high-redshift." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01061155.
Full textPanagoulia, Electra Kalliopi. "AGN feedback in local X-ray galaxy groups and clusters." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709121.
Full textHou, Jun. "Theoretical modelling of gas cooling and feedback in galaxy formation." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12259/.
Full textGurkan, Uygun Gulay. "Accretion modes, AGN feedback and star formation." Thesis, University of Hertfordshire, 2016. http://hdl.handle.net/2299/17239.
Full textIneson, Judith. "The epoch and environmental dependence of radio-loud active galaxy feedback." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/400891/.
Full textSmith, Matthew Carey. "Modelling star formation and stellar feedback in numerical simulations of galaxy formation." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277830.
Full textChamberlain, Carter W. "Quasar Outflows: Their Scale, Behavior and Influence in the Host Galaxy." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/70911.
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Kimm, Taysun. "On the importance of feedback in the stream-fed high redshift universe." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:e3e1c3b0-ff41-4b85-8f16-9b2739e36790.
Full textTreb, Robin Gopala. "Galactic fountain flows in high-resolution hydrodynamical simulations of galaxy disks." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/9913/.
Full textSrisawat, Chaichalit. "Semi-analytic model of galaxy formation with radiative feedback during the Epoch of Reionisation." Thesis, University of Sussex, 2016. http://sro.sussex.ac.uk/id/eprint/65583/.
Full textNisbet, David Maltman. "Role of active galactic nuclei in galaxy evolution." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31366.
Full textWeinberger, Rainer [Verfasser], and Volker [Akademischer Betreuer] Springel. "Supermassive black holes and their feedback effects in galaxy formation / Rainer Weinberger ; Betreuer: Volker Springel." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177691388/34.
Full textJacob, Svenja [Verfasser], and Volker [Akademischer Betreuer] Springel. "Cosmic ray feedback in galaxy formation and a numerical model for turbulence / Svenja Jacob ; Betreuer: Volker Springel." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177149737/34.
Full textCaldwell, C. E. "Cosmology with velocity dispersion based counts of groups and the effect of AGN feedback on host galaxy morphology." Thesis, Liverpool John Moores University, 2017. http://researchonline.ljmu.ac.uk/5261/.
Full textColla, Saverio Francesco. "Identification and analysis of super-bubbles candidates in Milky Way-like galaxy simulations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20876/.
Full textConcas, Alice [Verfasser], Elisa [Akademischer Betreuer] Resconi, Elisa [Gutachter] Resconi, and Shawn [Gutachter] Bishop. "The galaxy baryon cycle: environment, star-formation, and black hole feedback. / Alice Concas ; Gutachter: Elisa Resconi, Shawn Bishop ; Betreuer: Elisa Resconi." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/116415706X/34.
Full textPeeples, Molly S. "From Galaxies to the Intergalactic Medium." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1280965443.
Full textKalfountzou, Eleni. "The evolution of AGN and their host galaxies." Thesis, University of Hertfordshire, 2015. http://hdl.handle.net/2299/17004.
Full textDi, Federico Laura. "The kinematics and observable properties of AGN jets and cavities with cosmological simulations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25346/.
Full textFalkendal, Theresa Maria. "Constraining star formation rates and AGN feedback in high-z radio galaxies." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS248.
Full textThe evolution of galaxies is something that is still not well understood. The cosmic star formation rate density peaks between 1 < z < 3. It is therefore important to investigate the high-z Universe and the mechanisms which triggers or quenches star-formation in galaxies. In this thesis I investigate the effects of AGN feedback by studying high-z radio galaxies (HzRGs). For a sample of 25 HzRGs at 1 < z < 5.2, I add new ALMA data and determine the star formation rates (SFR) by multi-wavelength spectral energy distribution fitting. The ALMA data reveals that the mm continuum emission can be complicated, with contributions from several thermal dust emission components and/or synchrotron emission. The new estimated SFRs are 7 times lower than in previous studies. We might therefore be observing the effect of the AGN suppressing the growth of the host galaxy. For one source I explore the possibilities of constraining the gas Physics of the host galaxy and the halo gas by combining MUSE and ALMA data cubes. Quiescent ionized halo gas is detected, which coincide with a molecular gas reservoir detected with ALMA in [C I]. These observations probe the complex multi-phase halo gas and show the power of multi-wavelength observations
Li, Miao. "Supernovae Feedback in Galaxy Formation." Thesis, 2017. https://doi.org/10.7916/D8DF73GD.
Full textSu, Kung-Yi. "Stellar Feedback, AGN Feedback and Fluid Microphysics in Galaxy Evolution." Thesis, 2019. https://thesis.library.caltech.edu/11518/1/Final_Caltech_Thesis_Kung-Yi_Su.pdf.
Full textUnderstanding how the baryonic physics affects the formation and evolution of galaxies is one of the most critical questions in modern astronomy. Significant progress in understanding stellar feedback and modeling them explicitly in simulations have made it possible to reproduce a wide range of observed galaxy properties. However, there are still various pieces of missing physics and uncertainties in galaxies of different mass range.
In this thesis, I will explore these missing pieces in baryonic physics on top of the Feedback in Realistic Environments (FIRE) stellar feedback in the cosmological hydrodynamic zoom-in simulations (FIRE-2 suite) and isolated galaxy simulations. These high-resolution simulations with FIRE physics capture multi-phase realistic interstellar medium (ISM) with gas cooling down to 10K, and star formations in dense clumps in giant molecular clouds. They are, therefore, an ideal tool for investigating the missing pieces in baryonic physics.
In the first part of the thesis, Chapter 2, I will focus on the discrete effects of stellar feedback like individual supernovae, hypernovae, and initial mass function (IMF) sampling in dwarfs (109-1010 M⊙). These discrete processes of stellar feedback can have maximum effects on the small galaxies without being averaged out. I will show that the discretization of supernovae (SNe) is absolutely necessary, while the effects from IMF sampling and hypernovae (HNe) is not apparent, due to the strong clustering nature of star formation.
In the second part of the thesis, Chapter 3-4, I will focus on fluid microphysics, exploring their effects on galaxy properties and their interplay with stellar feedback in sub-L* galaxies. I will demonstrate that, once the stellar feedback is explicitly implemented as FIRE stellar feedback model, fluid microphysics such as magnetic fields, conduction, and viscosity only have minor effects on the galaxy properties like star formation rate (SFR), phase structure, or outflows. Stellar feedback also strongly alters the amplifications and morphology of the magnetic fields, resulting in much more randomly-oriented field lines. However, despite the stellar feedback, the amplification of magnetic fields in ISM gas is primarily dominated by flux-freezing compression.
In the final part of my thesis, I focus on the massive cluster ellipticals of 1012-1014 M⊙, where the physical mechanisms that regulate the observation-inferred cooling flows are highly uncertain -- the classic "cooling flow problem". I showed that solutions in the literature not associated with an active galactic nucleus (AGN), including stellar feedback, the cosmic ray from stellar feedback, magnetic fields, conduction, and morphological quenching, cannot possibly quench the galaxies, mostly because of the insufficient energy and the limited size of the affected region. After ruling out the non-AGN feedback solutions to the cooling flow problem, I will go into the most accessible, and perhaps promising solution: "AGN feedback", exploring the generic classes of AGN feedback models proposed in the literature. I am going to show that enhancing turbulence and injecting cosmic ray are probably the most important aspects of AGN feedback in galaxy quenching. Since they provide non-thermal pressure support that stably suppresses the core density, they can stably reduce the cooling flows without overheating the galactic cores.
Li, Yuan. "AGN Feedback in Cool-Core Galaxy Clusters." Thesis, 2014. https://doi.org/10.7916/D8989DWM.
Full textLi, Zhiyuan. "The role of stellar feedback in galaxy evolution." 2009. https://scholarworks.umass.edu/dissertations/AAI3349728.
Full textZhiyuan, Li. "The Role of Stellar Feedback in Galaxy Evolution." 2009. https://scholarworks.umass.edu/open_access_dissertations/14.
Full textTang, Shikui. "Galactic bulge feedback and its impact on galaxy evolution." 2009. https://scholarworks.umass.edu/dissertations/AAI3380030.
Full textGiodini, Stefania [Verfasser]. "Galaxy groups in the COSMOS survey : cosmic laboratories for galaxy evolution and feedback / vorgelegt von Stefania Giodini." 2010. http://d-nb.info/1006652949/34.
Full text"Investigating Galaxy Evolution and Active Galactic Nucleus Feedback with the Sunyaev-Zel'dovich Effect." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.45503.
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Doctoral Dissertation Astrophysics 2017
Paterno-Mahler, Rachel Beth. "Radio active galactic nuclei in galaxy clusters: feedback, merger signatures, and cluster tracers." Thesis, 2015. https://hdl.handle.net/2144/14065.
Full textHummels, Cameron Bryce. "Comparing Simulations and Observations of Galaxy Evolution: Methods for Constraining the Nature of Stellar Feedback." Thesis, 2012. https://doi.org/10.7916/D8SN0H1C.
Full textSilva, Marckelson Santana da. "Probing Galaxy Evolution and Feedback using Giant Gaseous Structures associated with High Redshift Active Galaxies." Doctoral thesis, 2019. https://hdl.handle.net/10216/124459.
Full textSilva, Marckelson Santana da. "Probing Galaxy Evolution and Feedback using Giant Gaseous Structures associated with High Redshift Active Galaxies." Tese, 2019. https://hdl.handle.net/10216/124459.
Full textFarage, Catherine. "The Link Between Extended Line Emission and AGN Feedback in Brightest Cluster Galaxies." Phd thesis, 2011. http://hdl.handle.net/1885/9057.
Full textBildfell, Christopher John. "The Stellar Content in Clusters of Galaxies." Thesis, 2013. http://hdl.handle.net/1828/4562.
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bildfell@uvic.ca
Richard-Laferrière, Annabelle. "L'impact des trous noirs les plus massifs de l’Univers sur le coeur des amas de galaxies." Thèse, 2019. http://hdl.handle.net/1866/22724.
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