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Title: Galactic-scale outflows in galaxies of the local universe
Author: Roberts-Borsani, Guido
ISNI:       0000 0004 8507 5481
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2019
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Galactic-scale gas outflows form a crucial ingredient in today's galaxy evolution mod- els and are thought to regulate the gas contents - and therefore evolution - of galaxies. However, outflows are poorly understood, and thus far have been studied primarily in extreme objects rather than the normal star-forming populations. As such, several out- standing questions remain and determining the prevalence and properties of outflows in normal, star-forming galaxies, as well as their quenching potential is a prerequisite towards obtaining a complete picture of galaxy evolution. Specifically, major questions include: What is the prevalence of outflows in normal galaxies and what are their main drivers and properties? Are the properties of outflows enhanced by the presence of an AGN? What are the kpc-scale properties of outflows? Are outflows seen in all gas phases and what are their relative fractions? This Thesis aims to answers these questions by making use of the largest integrated and IFU spectroscopic data sets currently available such as the SDSS, MaNGA, xCOLD GASS, xGASS and ALFALFA surveys. Using the NaD ISM doublet and a variety of stacking techniques, we investigate the large-scale prevalence and properties of outflows in normal galaxies at z ∼0 with SDSS spectra, the kpc-scale outflow properties and their relation to galaxy properties with MaNGA IFU spectra, and finally investigate the multi- phase (i.e., molecular, neutral and ionised) nature of outflows with a stacking analysis of CO(1-0), H i 21cm, NaD and Hα tracers using the xCOLD GASS, xGASS, ALFALFA and MaNGA surveys. The Thesis finishes off with the investigation of the possible presence of a molecular gas outflow in a high redshift, lensed galaxy for which multitransitional CO and C i spectra were obtained with the IRAM 30m telescope.
Supervisor: Saintonge, A. ; Ellis, R. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available