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Title: Investigating the high-frequency-radio source population using the Arcminute Microkelvin Imager
Author: Davies, M. L.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2011
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This thesis describes observations of the high-frequency-selected radio-source population carried out, primarily, using the Arcminute Microkelvin Imager (AMI). AMI comprises two separate radio interferometers, both operating in the 15-GHz band and located at the Mullard Radio Astronomy Observatory, Lord’s Bridge, Cambridgeshire. The commissioning of the AMI Large Array (LA), including obtaining the first fringes from the instrument are described. Steps to improve the quality of the data produced using AMI are also detailed. For instance, changes to the flux-density scale adopted for calibrating AMI data and the automated procedures for producing calibration files are outlined. The development of a new method of observing with AMI – drift scanning – is also described. The high-frequency-selected source population is relatively unexplored, owing to the time-consuming nature of survey work at such frequencies. AMI has been used to explore this population in two ways: using targeted follow-up observations of sources detected as part of a previous survey by the Wilkinson Microwave Anisotropy Probe and by carrying out blind survey work. The first results from the Tenth Cambridge (10C) Survey of Radio Sources, carried out using the AMI LA, are presented. The survey covers ≈ 27 deg2 to a completeness limit of 1 mJy and ≈ 12 deg2 to 0.5 mJy. This represents the deepest radio survey of any significant sky area (≥ 0.2 deg2) above 1.4 GHz. The 5-σ source catalogue from the 10C survey, which contains 1897 entries, has been used to extend the 15-GHz-band source counts to 0.5 mJy. The measured count has been compared to model predictions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available