dc.contributor.author Charlton, Paul dc.date.accessioned 2017-04-24 17:44:57 (GMT) dc.date.available 2017-04-24 17:44:57 (GMT) dc.date.issued 2017-04-24 dc.date.submitted 2017-04-11 dc.identifier.uri http://hdl.handle.net/10012/11727 dc.description.abstract Stellar mass has been shown to correlate with halo mass, but with significant scatter. The stellar mass-size and luminosity-size relationships of galaxies also show significant scatter in galaxy sizes for a fixed stellar mass. Investigating potential links between dark matter halo mass and properties of the baryons, like size, allows us to develop physical explanations for the observed variation in terms of how the baryons and dark matter interact. Galaxy-galaxy lensing allows us to probe the dark matter halos for stacked samples of galaxies, giving us an observational tool for finding halo masses. We extend the analysis of the galaxies in the CFHTLenS catalogue by fitting single S\'{e}rsic surface brightness profiles to the lens galaxies in order to recover half-light radius values, allowing us to determine halo masses for lenses according to their size. Comparing our halo masses and sizes to baselines for that stellar mass allows us to do a differential measurement of the halo mass-galaxy size relationship at fixed stellar mass, defined as: $M_{h}(M_{*}) \propto r_{\mathrm{eff}}^{\eta}(M_{*})$, and compare $\eta$($M_{*}$) over the mass range of our sample. We find that on average, our lens galaxies have an $\eta = 0.42\pm0.12$, i.e. larger galaxies live in more massive dark matter haloes. The trend is weakest for low mass blue galaxies and strongest for high mass large red galaxies (LRGs). This suggests that different processes are responsible for the strength of the observed trend over our range of stellar mass bins. Investigation of this relationship in hydrodynamical simulations suggests that this effect is strongest in satellite galaxies, and that the trend we observe in our data should be driven primarily by the fraction of satellite galaxies. en dc.language.iso en en dc.publisher University of Waterloo en dc.subject cosmology: observations en dc.subject gravitational lensing: weak en dc.subject dark matter en dc.subject galaxies: haloes en dc.subject galaxies: structure en dc.title The Dependence of Halo Mass on Galaxy Size at Fixed Stellar Mass Using Weak Lensing en dc.type Master Thesis en dc.pending false uws-etd.degree.department Physics and Astronomy en uws-etd.degree.discipline Physics en uws-etd.degree.grantor University of Waterloo en uws-etd.degree Master of Science en uws.contributor.advisor Hudson, Michael uws.contributor.advisor Balogh, Michael uws.contributor.affiliation1 Faculty of Science en uws.published.city Waterloo en uws.published.country Canada en uws.published.province Ontario en uws.typeOfResource Text en uws.peerReviewStatus Unreviewed en uws.scholarLevel Graduate en
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