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Title: New methods for detecting high-redshift clusters of galaxies
Author: Buttery, H. J.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2004
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The detection of high-redshift clusters of galaxies is important in under-standing the evolution of our Universe. Computer simulations, assuming hierarchical structure formation within a Ωλ » 0.7, ΩM » 0.3 universe, predict the galaxy clusters should be detected out to redshifts of z = 1. Traditional methods for finding clusters of galaxies, for example using optical plates, are not well to cluster detection beyond a redshift of z = 0.3, because they suffer from contamination of foreground sources. A new method of searching for galaxy clusters has been devised. It uses the hypothesis that at high redshifts radiosources trace high-density regions of our Universe. This would imply that high-redshift groupings of radiosources would be preferentially found in the high-density environments of galaxy clusters. I have used the Sydney University Molonglo Sky Survey (SUMSS) to search for groupings of five radiosources within a seven-arcminute circle. In this thesis I present the work extracting 60 cluster candidates from SUMSS. I also present the radio, infrared and optical follow-up observations that were undertaken and the implications of these. This thesis also discusses the Sunyaev Zel’dovich Effect (SZE), which is the inverse-Compton scattering of the Cosmic Microwave Background (CMB) by a plasma. This is another new method for detecting high-redshift clusters of galaxies. It is particularly important because the magnitude of the effect is independent of redshift. I include the observations of a galaxy cluster where this effect is apparent carried out at the Ryle Telescope (RT) in Cambridge.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available