Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.457319
Title: Clusters of galaxies
Author: Green, Martin R.
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1978
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
Abstract:
The observations on which this thesis are based are of three types: i) Spectroscopy of southern galaxies from which redshifts have been determined. These redshifts have enabled the calculation of velocity dispersions of the galaxies in five clusters of galaxies: Klemola 44, Sersic 40/6, 2354-35, A496 and the Pavo Group. Redshifts of galaxies in several other southern clusters have also been obtained. ii) Photographic Photometry using digitised two-dimensional micro-densitometer scans of IIIaJ Schmidt plates of two southern clusters of galaxies: K44 and Sersic 40/6. Similar photometry of two other clusters, A1146 and 2354-35, is also available. Magnitudes in the B-band to a limiting isophote of 27mag/o" are obtained for all galaxies to a limiting magnitude of ~20 within a ~2Mpc (Ho = 50 km s-1 Mpc-1) square around the cluster. Methods of distinguishing stars from galaxies are discussed. iii) Photoelectric photometry through several circular apertures of 21 bright southern galaxies, using the B, V, R and I bands. As well as providing catalogue data for southern galaxies, these readings supply magnitude zero-points for the photographic photometry of clusters. The results are discussed in the light of current theories of the morphology, formation and evolution of clusters of galaxies. The X-ray flux from clusters of galaxies is found to be consistent with emission by bremsstrahlung from a hot intracluster gas. Four of the clusters: Klemola 44, 2354-35, A1146 and Sersic 40/6 contain cD galaxies. These galaxies increase in ellipticity with radius and are aligned with their clusters (except A1146); such properties are predicted if cD galaxies evolve by accretion of other galaxies. It is suggested that Klemola 44 may be undergoing a phase of rapid core evolution, leading to the accretion of the core by the cD galaxy. The cluster 2354-35 may have already passed through this evolutionary stage.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.457319  DOI: Not available
Share: