{"id":{"repo_id":"cambridge","oai_identifier":"oai:www.repository.cam.ac.uk:1810/251795"},"canonical_url":"https://search.dev.ndltd.org/etd/cambridge/oai:www.repository.cam.ac.uk:1810/251795","repository":{"repo_id":"cambridge","name":"Cambridge University","base_url":"https://api.repository.cam.ac.uk/server/oai/request"},"display":{"title":"Using the Sunyaev-Zel'dovich effect.","abstract":"This work is concerned with the Sunyaev-Zel'dovich (S-Z) effect in clusters of galaxies and its use in cosmology. In Chapter 2, I consider possible causes of error in the determination of H0 from the uncertain geometry of clusters and complications such as lack of virialisation. From numerical simulations, I find that with 20 clusters, the resultant error is 8%. Chapter 3 details and tests a new maximum likelihood algorithm for the removal of contaminating radio sources. Two new estimates of H0 are presented, 78+26-20 km s-1 Mpc-1 for 0016+16 and 48+14-11 km s-1 Mpc-1 for A611. In chapters 4 and 5 I describe a search for new clusters via extended steep-spectrum radio emission due to merger events or head-tail sources. A candidate sample of possible high-redshift clusters is produced based on S326MHz > 65 mJy and a1.4GHz0.3GHz > 1.5. Six of these were then used as targets for S-Z observations; no unequivocal detection was found implying each cluster has a total mass <~ 10^15 Msun. Optical V, Rs and I follow-up in two of the fields shows two galaxies in each field with V - Rs ~ 3 and Rs ~ 20; similar observations of blank fields show no such galaxies and hence these are good candidate cluster members at z = 0.5-0.6.","abstract_html":"This work is concerned with the Sunyaev-Zel&#x27;dovich (S-Z) effect in clusters of galaxies and its use in cosmology. In Chapter 2, I consider possible causes of error in the determination of H0 from the uncertain geometry of clusters and complications such as lack of virialisation. From numerical simulations, I find that with 20 clusters, the resultant error is 8%. Chapter 3 details and tests a new maximum likelihood algorithm for the removal of contaminating radio sources. Two new estimates of H0 are presented, 78+26-20 km s-1 Mpc-1 for 0016+16 and 48+14-11 km s-1 Mpc-1 for A611. In chapters 4 and 5 I describe a search for new clusters via extended steep-spectrum radio emission due to merger events or head-tail sources. A candidate sample of possible high-redshift clusters is produced based on S326MHz &gt; 65 mJy and a1.4GHz0.3GHz &gt; 1.5. Six of these were then used as targets for S-Z observations; no unequivocal detection was found implying each cluster has a total mass &lt;~ 10^15 Msun. Optical V, Rs and I follow-up in two of the fields shows two galaxies in each field with V - Rs ~ 3 and Rs ~ 20; similar observations of blank fields show no such galaxies and hence these are good candidate cluster members at z = 0.5-0.6.","abstract_has_math":false,"creators":["Grainger, William Frank."],"institution":"University of Cambridge","degree_name":"Doctor of Philosophy (PhD)","degree_level":"Doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2001,"date_issued":"2001-10-09","date_published":"2001-10-09","updated_at":"2026-07-22T22:23:57Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":["https://www.repository.cam.ac.uk/bitstreams/67e57d7b-6024-415e-83e3-118e85155ee4/download","https://www.rioxx.net/licenses/all-rights-reserved/","https://www.repository.cam.ac.uk/bitstreams/e92ba46b-7518-4e26-a5a2-2ffb3c81c494/download"],"identifier_entries":[]},"links":{"outbound_url":"https://doi.org/10.17863/CAM.16635","outbound_label":"DOI","outbound_source":"dc:identifier.doi"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Grainger, William Frank."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2001-10-09"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cambridge"]},{"key":"dc:relation.isreferencedby.uri","label":"Dc Relation Isreferencedby URI","values":["https://www.repository.cam.ac.uk/handle/1810/251795"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Doctor of Philosophy (PhD)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["https://www.repository.cam.ac.uk/bitstreams/67e57d7b-6024-415e-83e3-118e85155ee4/download","https://www.rioxx.net/licenses/all-rights-reserved/","https://www.repository.cam.ac.uk/bitstreams/e92ba46b-7518-4e26-a5a2-2ffb3c81c494/download"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["10.17863/CAM.16635"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://www.repository.cam.ac.uk/bitstreams/122273a2-285f-4500-ae77-831106053e36/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This work is concerned with the Sunyaev-Zel'dovich (S-Z) effect in clusters of galaxies and its use in cosmology. 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