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Ultra-diffuse galaxy candidatesin stripe 82 clusters
The evolution of galaxies in the cluster environment is a complex process, with many outstanding questions. A wide range of galaxy morphologies, colours, sizes and luminosities are found in clusters, the least studied of which are the faint galaxy populations. Studying the faint end of the galaxy lu...
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| Format: | Thesis |
| Language: | English |
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Department of Astronomy
2020
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| _version_ | 1867613205344288768 |
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| access_status_str | Open Access |
| author | Makda, Nazir Ahmed Adam |
| author2 | Skelton, Rosalind |
| author_browse | Makda, Nazir Ahmed Adam Skelton, Rosalind |
| author_facet | Skelton, Rosalind Makda, Nazir Ahmed Adam |
| author_sort | Makda, Nazir Ahmed Adam |
| collection | Thesis |
| description | The evolution of galaxies in the cluster environment is a complex process, with many outstanding questions. A wide range of galaxy morphologies, colours, sizes and luminosities are found in clusters, the least studied of which are the faint galaxy populations. Studying the faint end of the galaxy luminosity distribution may provide a valuable insight into the evolution of galaxies in cluster environments. The largest of these faint galaxies are classified as Ultra-Diffuse galaxies (UDGs). UDGs are low surface brightness galaxies with a very low stellar mass component, however they have sizes comparable to the Milky Way. These galaxies are hard to detect and classify as they are very faint. To survive in the cluster environments, where they have been observed, these galaxies must contain significant amounts of dark matter as the strong tidal fields would normally tear diffuse low-mass galaxies apart. The high abundance of UDGs in clusters has only recently been recognized, therefore identifying and measuring their properties is key to understanding how they are formed and continue to exist. In this thesis, I search for low surface brightness galaxies, spanning from typical dwarf galaxies to UDGs, in 16 low redshift (z< b/a >= 0.52. The number of faint galaxies in clusters follows a power-law with respect to the cluster halo mass, N ∝ M1.05±0.45, determined through bootstrap resampling. This shows that the number of UDG candidates increases as the cluster halo mass increases. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/31737 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:26.116Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Department of Astronomy |
| publisherStr | Department of Astronomy |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/31737 Ultra-diffuse galaxy candidatesin stripe 82 clusters Makda, Nazir Ahmed Adam Skelton, Rosalind Blyth, Sarah Astronomy The evolution of galaxies in the cluster environment is a complex process, with many outstanding questions. A wide range of galaxy morphologies, colours, sizes and luminosities are found in clusters, the least studied of which are the faint galaxy populations. Studying the faint end of the galaxy luminosity distribution may provide a valuable insight into the evolution of galaxies in cluster environments. The largest of these faint galaxies are classified as Ultra-Diffuse galaxies (UDGs). UDGs are low surface brightness galaxies with a very low stellar mass component, however they have sizes comparable to the Milky Way. These galaxies are hard to detect and classify as they are very faint. To survive in the cluster environments, where they have been observed, these galaxies must contain significant amounts of dark matter as the strong tidal fields would normally tear diffuse low-mass galaxies apart. The high abundance of UDGs in clusters has only recently been recognized, therefore identifying and measuring their properties is key to understanding how they are formed and continue to exist. In this thesis, I search for low surface brightness galaxies, spanning from typical dwarf galaxies to UDGs, in 16 low redshift (z< b/a >= 0.52. The number of faint galaxies in clusters follows a power-law with respect to the cluster halo mass, N ∝ M1.05±0.45, determined through bootstrap resampling. This shows that the number of UDG candidates increases as the cluster halo mass increases. 2020-04-30T15:26:48Z 2020-04-30T15:26:48Z 2019 2020-04-30T14:21:40Z Master Thesis Masters MSc https://hdl.handle.net/11427/31737 eng application/pdf Department of Astronomy Faculty of Science |
| spellingShingle | Astronomy Makda, Nazir Ahmed Adam Ultra-diffuse galaxy candidatesin stripe 82 clusters |
| thesis_degree_str | Master's |
| title | Ultra-diffuse galaxy candidatesin stripe 82 clusters |
| title_full | Ultra-diffuse galaxy candidatesin stripe 82 clusters |
| title_fullStr | Ultra-diffuse galaxy candidatesin stripe 82 clusters |
| title_full_unstemmed | Ultra-diffuse galaxy candidatesin stripe 82 clusters |
| title_short | Ultra-diffuse galaxy candidatesin stripe 82 clusters |
| title_sort | ultra diffuse galaxy candidatesin stripe 82 clusters |
| topic | Astronomy |
| url | https://hdl.handle.net/11427/31737 |
| work_keys_str_mv | AT makdanazirahmedadam ultradiffusegalaxycandidatesinstripe82clusters |