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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

Characterising the Performance of High-Speed Data Converters for RFSoC-based Radio Astronomy Receivers

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP)

Authors:

Chao Liu, Michael E Jones, Angela C Taylor

Abstract:

RF system-on-chip (RFSoC) devices provide the potential for implementing a complete radio astronomy receiver on a single board, but performance of the integrated analogue-to-digital converters is critical. We have evaluated the performance of the data converters in the Xilinx ZU28DR RFSoC, which are 12-bit, 8-fold interleaved converters with a maximum sample speed of 4.096 Giga-sample per second (GSPS). We measured the spurious-free dynamic range (SFDR), signal-to-noise and distortion (SINAD), effective number of bits (ENOB), intermodulation distortion (IMD) and cross-talk between adjacent channels over the bandwidth of 2.048 GHz. We both captured data for off-line analysis with floating-point arithmetic, and implemented a real-time integer arithmetic spectrometer on the RFSoC. The performance of the ADCs is sufficient for radio astronomy applications and close to the vendor specifications in most of the scenarios. We have carried out spectral integrations of up to 100 s and stability tests over tens of hours and find thermal noise-limited performance over these timescales.
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First Detection of Spectral Variations of Anomalous Microwave Emission with QUIJOTE and C-BASS

Authors:

R Cepeda-Arroita, S Harper, C Dickinson, Ja Rubiño-Martín, Rt Génova-Santos, Angela C Taylor, Tj Pearson, M Ashdown, A Barr, Rb Barreiro, B Casaponsa, Fj Casas, Hc Chiang, R Fernandez-Cobos, Rdp Grumitt, F Guidi, Hm Heilgendorff, D Herranz, Lrp Jew, Jl Jonas, Michael E Jones, A Lasenby, J Leech, Jp Leahy, E Martínez-González, Mw Peel, F Poidevin, L Piccirillo, Acs Readhead, R Rebolo, B Ruiz-Granados, J Sievers, F Vansyngel, P Vielva, Ra Watson

Abstract:

Anomalous Microwave Emission (AME) is a significant component of Galactic diffuse emission in the frequency range $10$-$60\,$GHz and a new window into the properties of sub-nanometre-sized grains in the interstellar medium. We investigate the morphology of AME in the $\approx10^{\circ}$ diameter $\lambda$ Orionis ring by combining intensity data from the QUIJOTE experiment at $11$, $13$, $17$ and $19\,$GHz and the C-Band All Sky Survey (C-BASS) at $4.76\,$GHz, together with 19 ancillary datasets between $1.42$ and $3000\,$GHz. Maps of physical parameters at $1^{\circ}$ resolution are produced through Markov Chain Monte Carlo (MCMC) fits of spectral energy distributions (SEDs), approximating the AME component with a log-normal distribution. AME is detected in excess of $20\,\sigma$ at degree-scales around the entirety of the ring along photodissociation regions (PDRs), with three primary bright regions containing dark clouds. A radial decrease is observed in the AME peak frequency from $\approx35\,$GHz near the free-free region to $\approx21\,$GHz in the outer regions of the ring, which is the first detection of AME spectral variations across a single region. A strong correlation between AME peak frequency, emission measure and dust temperature is an indication for the dependence of the AME peak frequency on the local radiation field. The AME amplitude normalised by the optical depth is also strongly correlated with the radiation field, giving an overall picture consistent with spinning dust where the local radiation field plays a key role.
More details from the publisher
More details
Details from ArXiV

First Detection of Spectral Variations of Anomalous Microwave Emission with QUIJOTE and C-BASS

Authors:

R Cepeda-Arroita, S Harper, C Dickinson, Ja Rubiño-Martín, Rt Génova-Santos, Angela C Taylor, Tj Pearson, M Ashdown, A Barr, Rb Barreiro, B Casaponsa, Fj Casas, Hc Chiang, R Fernandez-Cobos, Rdp Grumitt, F Guidi, Hm Heilgendorff, D Herranz, Lrp Jew, Jl Jonas, Michael E Jones, A Lasenby, J Leech, Jp Leahy, E Martínez-González, Mw Peel, F Poidevin, L Piccirillo, Acs Readhead, R Rebolo, B Ruiz-Granados, J Sievers, F Vansyngel, P Vielva, Ra Watson

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