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Title: The field of the quasar pair PC1643+4631A and B
Author: Haynes, Toby James William
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1999
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Abstract:
Chapter 1 describes the theory and previous observations of the S-Z effect, and its potential importance for determining the evolution of clusters and antecedents. In Chapter 2 I describe the detection with the RT of an S-Z decrement towards the quasar pair PC1643+4631A&B at z = 3.8, and also describe the optical and infrared followup to constrain the nature and distance of the cluster responsible; this work was shared with the authors of Jones et al. 1997 and Saunders et al. 1997, although additional work I have done is included. Deeper imaging proved necessary, and in Chapter 3 I detail the reduction I carried out of the broadband and narrowband imaging of the PC1643 field with the William Herschel Telescope. In Chapter 4, I examine the isophotal aperture catalogues produced with FOCAS and SExtractor to determine some of the limitations of the algorithms used, and assess the difficulties and systematic errors arising from the use of isophotal apertures. In Chapter 5, I present the results obtained using the catalogues made with FOCAS and SExtractor codes, including the identification of intermediate and high-redshift galaxy candidates selected using colour criteria. To further constrain the distributions of objects in the field of PC1643, I used the photometric redshift technique to produce estimated redshifts for objects in the field; both the methods used and results obtained are discussed in Chapter 6, which also covers the simulations I designed to examine the accuracy and problems involved in using photometric redshift estimates. I further determine that deep optical surveys are confusion-limited and discuss the effects this has on colour-selected samples. Chapter 7 reviews the findings of the thesis and suggests areas of further work.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.603887  DOI: Not available
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