Investigating galaxy size growth and stellar mass assembly through the buildup of stellar haloes since z ∼ 1.1

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dc.contributor.advisor Sawicki, Marcin, 1969-
dc.contributor.advisor Damjanov, Ivana
dc.creator Williams, Devin J.
dc.date.accessioned 2023-09-11T17:09:47Z
dc.date.available 2023-09-11T17:09:47Z
dc.date.issued 2023-08-03
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/31832
dc.description 1 online resource (ix, 158 pages) : illustrations (some colour), charts (some colour), graphs (some colour)
dc.description Includes abstract and appendices.
dc.description Includes bibliographical references (pages 145-158).
dc.description.abstract In our current theoretical framework of galaxy formation and evolution, galaxies assemble stellar halo components through galaxy-galaxy interactions and accretion of ex-situ material. Studying this buildup of stellar haloes helps us better understand the processes driving the size growth and mass assembly of galaxies. In this work, we investigate the stellar halo assembly of &sim;500,000 galaxies over 0.2&le; z &le;1.1, by analyzing the evolution in their radial surface brightness and colour profiles. We find that since z=1.1 more massive galaxies assemble larger and brighter stellar haloes, and this assembly is inducing negative colour gradients. Quiescent galaxies grow more through ex-situ accretion than star-forming galaxies of similar masses, which results in faster evolution of quiescent galaxy sizes (<em>R</em><sub>e</sub>). Our results suggest that minor mergers drive the size growth of galaxy haloes since z=1.1, while major mergers fuel the mass assembly and further size growth of the most massive (M<sub>⋆</sub>&ge;10<sup>10.5</sup>M<sub>⊙</sub>) quiescent galaxies. en_CA
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dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University
dc.subject.lcsh Galaxies -- Formation
dc.subject.lcsh Galaxies -- Evolution
dc.subject.lcsh Stars -- Masses -- Measurement
dc.subject.lcsh Galactic halos
dc.title Investigating galaxy size growth and stellar mass assembly through the buildup of stellar haloes since z &sim; 1.1
dc.type Text en_CA
thesis.degree.name Master of Science in Astronomy
thesis.degree.level Masters
thesis.degree.discipline Astronomy and Physics
thesis.degree.grantor Saint Mary's University (Halifax, N.S.)
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