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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Angela Taylor

Professor of Experimental Astrophysics

Research theme

  • Astronomy and astrophysics
  • Particle astrophysics & cosmology
  • Instrumentation

Sub department

  • Astrophysics

Research groups

  • Experimental radio cosmology
  • C-BASS
  • The Square Kilometre Array (SKA)
Angela.Taylor@physics.ox.ac.uk
Telephone: 01865 (2)73297
Denys Wilkinson Building, room 753
  • About
  • Publications

Astronomical receiver modelling using scattering matrices

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 446:2 (2015) 1252-1267

Authors:

OG King, Michael E Jones, C Copley, RJ Davis, JP Leahy, J Leech, SJC Muchovej, TJ Pearson, Angela C Taylor
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Astronomical receiver modelling using scattering matrices

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 446:2 (2015) 1252-1267

Authors:

OG King, ME Jones, C Copley, RJ Davis, JP Leahy, J Leech, SJC Muchovej, TJ Pearson, AC Taylor

The C-Band All-Sky Survey (C-BASS): design and implementation of the northern receiver

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 438:3 (2014) 2426-2439

Authors:

OG King, Michael E Jones, EJ Blackhurst, C Copley, RJ Davis, C Dickinson, CM Holler, MO Irfan, JJ John, JP Leahy, J Leech, SJC Muchovej, TJ Pearson, MA Stevenson, Angela C Taylor
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A circularly symmetric antenna design with high polarization purity and low spillover

IEEE Transactions on Antennas and Propagation 61:1 (2013) 117-124

Authors:

CM Holler, AC Taylor, ME Jones, OG King, SJC Muchovej, MA Stevenson, RJ Wylde, CJ Copley, RJ Davis, TJ Pearson, ACS Readhead

Abstract:

We describe the development of two circularly symmetric antennas with high polarization purity and low spill-over. Both were designed to be used in an all-sky polarization and intensity survey at 5 GHz (the C-Band All-Sky Survey, C-BASS). The survey requirements call for very low cross-polar signal levels and far-out sidelobes. Two different existing antennas, with 6.1-m and 7.6-m diameter primaries, were adapted by replacing the feed and secondary optics, resulting in identical beam performances of 0.73\circ FWHM, cross-polarization better than - 50 dB, and far-out sidelobes below -70 dB. The polarization purity was realized by using a symmetric low-loss dielectric foam support structure for the secondary mirror, avoiding the need for secondary support struts. Ground spill-over was largely reduced by using absorbing baffles around the primary and secondary mirrors, and by the use of a low-sidelobe profiled corrugated feedhorn. The 6.1-m antenna and receiver have been completed and tested. Results show that the co-polar beam matches the design simulations very closely in the main beam and down to levels of - 80 dB in the backlobes. With the absorbing baffles in place the far-out (>100{\circ}) sidelobe response is reduced below -90 dB. Cross-polar response could only be measured down to a noise floor of - 20 dB but is also consistent with the design simulations. Temperature loading and groundspill due to the secondary support were measured at less than 1 K. © 1963-2012 IEEE.
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The first billion years: report of a study program

(2012)

Authors:

J Bowman, S Furlanetto, D Jones, A Readhead, Y Ali-Hamimoud, J Bock, G Bower, M Bradford, C Carilli, T Chang, R Chary, J Chluba, S Church, G Cotter, A Cooray, D DeBoer, A Oliveira-Costa, R Dean, O Dore, T Gaier, K Grainge, J Gunderson, C Hirata, ME Jones, G Keating, C Lawrence, L Levenson, J lazio, P Lubin, T Pearson, J Pritchard, A Pullen, S Rawlings, D Reichers, L Samoska, M Seiffert, AC Taylor

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