|Title: ||Blind and pointed Sunyaev-Zel'dovich observations with the Arcminute Microkelvin Imager|
|Authors: ||Shimwell, Timothy William|
|Supervisors: ||Grainge, Keith|
|Keywords: ||Observationjal cosmology|
|Issue Date: ||8-Nov-2011|
|Abstract: ||In this thesis I discuss my work on the Arcminute Microkelvin Imager (AMI). I focus on the detection of Sunyaev-Zel’dovich (SZ) signatures at 14-18GHz.
Once the background science and operation of the instrument are described I proceed to present my contribution to the calibration of AMI, including: primary beam measurements; refinements to the known antenna geometry and flagging geostationary satellite interference. This is followed by an outline of the software that I have developed to subtract sources from visibilities, concatenate data from multiple observations, simulate data, and perform jack-knife tests to evaluate the magnitude of systematic errors.
The Bayesian analysis that I use to obtain parameter estimates and to quantify the significance of putative SZ detections is described. I perform realistic simulations of clusters and use these to characterise
the analysis. I then, for the first time, apply the analysis to data from the AMI blind cluster survey. I identify several previously unknown
Finally, I conduct pointed observations towards a high luminosity subsample of eight clusters from the Local Cluster Substructure Survey
(LoCuSS). For each of these I provide probability distributions of parameters such as mass, radius, and temperature. I compare my
results to those in the literature and find an overall agreement.|
|Description: ||In this thesis I introduce the Arcminute Microkelvin Imager. I analyse observations towards known galaxy clusters and I present the initial results from a blind survey for galaxy clusters.|
|Appears in Collections:||Theses - Department of Physics|
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