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Galaxy distributions within and around observed and simulated groups

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posted on 2023-06-10, 04:30 authored by Stephen David Riggs
This thesis explores the properties and distributions of galaxies within and around galaxy groups, making use of galaxy clustering statistics. We include both observations and simulations in this analysis. In the first part we explore the properties of galaxies in the GAMA survey and the L-GALAXIES and SHARK semi-analytic models. We examine which elements of the models affect the predictions for galaxy stellar masses, luminosities and clustering, and find that satellite galaxy physics plays an important role in the small-scale clustering. In the second part we determine the cross-correlation between groups and galaxies in the GAMA survey, to explore both the group profile and the large-scale bias around groups, and provide comparisons against the IllustrisTNG simulations and L-GALAXIES model. Using marked clustering statistics we find that the clustering depends strongly on the group masses, but has very little dependence on galaxy masses. We then explore the differences in distributions of galaxies in groups in full-physics and dark matter-only simulations. Using satellites matched between the IllustrisTNG simulations and their dark matter-only equivalents, we find that the satellites reside closer to the group centre and have enhanced survival times in the full-physics simulations. We split the satellites of IllustrisTNG into those which possess dark matter-only equivalents and those which do not, and create empirical models for both of these populations. Finally, we apply these empirical corrections in the L-GALAXIES and SHARK models, and explore the impact this has on their predictions for galaxy clustering.

History

File Version

  • Published version

Pages

201.0

Department affiliated with

  • Physics and Astronomy Theses

Qualification level

  • doctoral

Qualification name

  • phd

Language

  • eng

Institution

University of Sussex

Full text available

  • Yes

Legacy Posted Date

2022-08-24

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