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Title: Using the Sunyaev-Zel'dovich effect
Author: Grainger, William Frank
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2001
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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 dm s-1 Mpc-1 for 0016+16 and 40+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 α1.4GHz0.3GHz > 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 ≲ 1015 M. 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.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral