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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

A 2-20-GHz analog lag correlator for radio interferometry

IEEE Transactions on Instrumentation and Measurement 61:8 (2012) 2253-2261

Authors:

CM Holler, ME Jones, AC Taylor, AI Harris, SA Maas

Abstract:

We present the design and testing of a 2-20-GHz continuum-band analog lag correlator with 16 frequency channels for astronomical interferometry. The correlator has been designed for future use with a prototype single-baseline interferometer operating at 185-275 GHz. The design uses a broad-band Wilkinson divider tree with integral thin-film resistors implemented on an alumina substrate, and custom-made broad-band InGaP/GaAs Gilbert Cell multipliers. The prototype correlator has been fully bench-tested, together with the necessary readout electronics for acquisition of the output signals. The results of these measurements show that the response of the correlator is well behaved over the band. An investigation of the noise behavior also shows that the signal-to-noise ratio of the system is not limited by the correlator performance. © 1963-2012 IEEE.
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MESMER: MeerKAT Search for Molecules in the Epoch of Reionization

ArXiv e-prints (2011)

Authors:

I Heywood, RP Armstrong, R Booth, AJ Bunker, RP Deane, MJ Jarvis, JL Jonas, ME Jones, H Kloeckner, J Kneib, KK Knudsen, F Levrier, D Obreschkow, D Rigopoulou, S Rawlings, OM Smirnov, AC Taylor, A Verma, J Dunlop, MG Santos, ER Stanway, C Willott
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A parametric physical model for the intracluster medium and its use in joint SZ/X-ray analyses of galaxy clusters

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 410:1 (2011) 341-358

Authors:

James R Allison, Angela C Taylor, Michael E Jones, Steve Rawlings, Scott T Kay
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Dust-correlated centimetre-wave radiation from the M78 reflection nebula

Monthly Notices of the Royal Astronomical Society 411:2 (2011) 1137-1150

Authors:

P Castellanos, S Casassus, C Dickinson, M Vidal, R Paladini, K Cleary, RD Davies, RJ Davis, GJ White, A Taylor

Abstract:

An anomalous radio continuum component at cm-wavelengths has been observed in various sources, including dark clouds. This continuum component represents a new property of the interstellar medium. In this work, we focus on one particular dark cloud, the bright reflection nebula M78. The main goal of this work is to investigate the cm-wave continuum emission in a prominent molecular cloud, nearby and with complementary observational data. We acquired Cosmic Background Imager (CBI) visibility data of M78 at 31 GHz with an angular resolution of ∼ 5.8arcmin, and CBI2 data at an angular resolution of ∼ 4.2arcmin. A morphological analysis was undertaken to search for possible correlations with templates that trace different emission mechanisms. Using data from Wilkinson Microwave Anisotropy Probe and the Rhodes/HartRAO 2326-MHz survey, we constructed the spectral energy distribution (SED) of M78 in a 45-arcmin circular aperture. We used results from the literature to constrain the physical conditions and the stellar content. The 5-31 GHz spectral index in flux density (α= 1.89 ± 0.15) is significantly different from optically thin free-free values. We also find closer morphological agreement with IR dust tracers than with free-free sources. Dust-correlated cm-wave emission that is not due to free-free is significant at small scales (CBI resolutions). However, a free-free background dominates at cm-wavelengths on large scales (∼ 1°). We correct for this uniform background by differencing against a set of reference fields. The differenced SED of M78 shows excess emission at 10-70 GHz over free-free and a modified blackbody, at 3.4σ. The excess is matched by the spinning dust model from Draine & Lazarian. © 2010 Universidad de Chile. Journal compilation © 2010 RAS.
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Dust-correlated cm wavelength continuum emission from translucent clouds ζ Oph and LDN 1780

Monthly Notices of the Royal Astronomical Society (2011)

Authors:

M Vidal, S Casassus, C Dickinson, AN Witt, P Castellanos, RD Davies, RJ Davis, G Cabrera, K Cleary, JR Allison, JR Bond, L Bronfman, R Bustos, ME Jones, R Paladini, TJ Pearson, ACS Readhead, R Reeves, JL Sievers, AC Taylor
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