Hunting for the Primordial Quenched Population in 2 < z < 2.5 COSMOS Protoclusters
| dc.contributor.author | Edward, Adit Harin | |
| dc.date.accessioned | 2024-01-17T18:57:29Z | |
| dc.date.available | 2024-01-17T18:57:29Z | |
| dc.date.issued | 2024-01-17 | |
| dc.date.submitted | 2024-01-03 | |
| dc.description.abstract | We present an analysis of the galaxy stellar mass function (SMF) of 14 known protoclusters between 2.0 < z < 2.5 in the COSMOS field, down to a mass limit of 10⁹ᐧ⁵ M⊙. We use existing photometric redshifts with a statistical background subtraction, and consider star−forming and quiescent galaxies identified from (NUV−r) and (r−J) colours separately. Our fiducial sample includes galaxies within 1 Mpc of the cluster centres. The shape of the protocluster SMF of star−forming galaxies is indistinguishable from that of the general field at this redshift. Quiescent galaxies, however, show a flatter SMF than in the field, with an upturn at low mass, though this is only significant at ∼2σ. There is no strong evidence for a dominant population of quiescent galaxies at any mass, with a fraction <15% at 1σ confidence for galaxies with łog(M⋆/M⊙)<10.5. We compare our results with a sample of galaxy groups at 1<z<1.5, and demonstrate that a significant amount of environmental quenching must take place between these epochs, increasing the relative abundance of high−mass (M⋆ > 10¹⁰ᐧ⁵ M⊙) quiescent galaxies by a factor ≳ 2. However, we find that at lower masses (M⋆ < 10¹⁰ᐧ⁵ M⊙), no additional environmental quenching is required. | en |
| dc.identifier.uri | http://hdl.handle.net/10012/20240 | |
| dc.language.iso | en | en |
| dc.pending | false | |
| dc.publisher | University of Waterloo | en |
| dc.relation.uri | https://cosmos.astro.caltech.edu/ | en |
| dc.subject | galaxy evolution | en |
| dc.subject | galaxy clusters | en |
| dc.subject | galaxy protoclusters | en |
| dc.title | Hunting for the Primordial Quenched Population in 2 < z < 2.5 COSMOS Protoclusters | en |
| dc.type | Master Thesis | en |
| uws-etd.degree | Master of Science | en |
| uws-etd.degree.department | Physics and Astronomy | en |
| uws-etd.degree.discipline | Physics | en |
| uws-etd.degree.grantor | University of Waterloo | en |
| uws-etd.embargo.terms | 0 | en |
| uws.contributor.advisor | Balogh, Michael | |
| uws.contributor.affiliation1 | Faculty of Science | en |
| uws.peerReviewStatus | Unreviewed | en |
| uws.published.city | Waterloo | en |
| uws.published.country | Canada | en |
| uws.published.province | Ontario | en |
| uws.scholarLevel | Graduate | en |
| uws.typeOfResource | Text | en |