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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.

Dr James Allison

CDF (Christ Church)

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
  • Hintze Centre for Astrophysical Surveys
  • MeerKAT
james.allison@physics.ox.ac.uk
Christ Church webpage
  • About
  • Teaching
  • Research
  • Publications

An HI absorption distance to the black hole candidate X-ray binary MAXI J1535-571

Monthly Notices of the Royal Astronomical Society Oxford University Press 488:1 (2019) L129-L133

Authors:

J Chauhan, JCA Miller-Jones, GE Anderson, W Raja, A Bahramian, A Hotan, B Indermuehle, M Whiting, James Allison, C Anderson, J Bunton, B Koribalski, E Mahony
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Ionization of the atomic gas in redshifted radio sources

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 484:1 (2019) 1182-1191

Authors:

SJ Curran, RW Hunstead, HM Johnston, MT Whiting, EM Sadler, JR Allison, R Athreya
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The performance and calibration of the CRAFT fly’s eye fast radio burst survey

Publications of the Astronomical Society of Australia Cambridge University Press 36 (2019) e009

Authors:

CW James, KW Bannister, J-P Macquart, RD Ekers, S Oslowski, RM Shannon, James Allison, AP Chippendale, JD Collier, T Franzen, AW Hotan, M Leach, D McConnell, MA Pilawa, MA Voronkov, MT Whiting

Abstract:

The Commensal Real-time Australian Square Kilometre Array Pathfinder Fast Transients survey is the first extensive astronomical survey using phased array feeds. Since January 2017, it has been searching for fast radio bursts in fly’s eye mode. Here, we present a calculation of the sensitivity and total exposure of the survey that detected the first 20 of these bursts, using the pulsars B1641-45 and B0833-45 as calibrators. The beamshape, antenna-dependent system noise, and the effects of radio-frequency interference and fluctuations during commissioning are quantified. Effective survey exposures and sensitivities are calculated as a function of the source counts distribution. Statistical ‘stat’ and systematics ‘sys’ effects are treated separately. The implied fast radio burst rate is significantly lower than the 37 sky−1 day−1 calculated using nominal exposures and sensitivities for this same sample by Shannon et al. (2018). At the Euclidean (best-fit) power-law index of −1.5 (−2.2), the rate is (sys) ± 3.6 (stat) sky−1 day−1 ( (sys) ± 2.8 (stat) sky−1 day−1) above a threshold of 56.6 ± 6.6(sys) Jy ms (40.4 ± 1.2(sys) Jy ms). This strongly suggests that these calculations be performed for other FRB-hunting experiments, allowing meaningful comparisons to be made between them.
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WALLABY early science – I. The NGC 7162 galaxy group

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 482:3 (2019) 3591-3608

Authors:

TN Reynolds, T Westmeier, L Staveley-Smith, A Elagali, B-Q For, D Kleiner, BS Koribalski, K Lee-Waddell, JP Madrid, A Popping, J Rhee, M Whiting, OI Wong, LJM Davies, S Driver, A Robotham, JR Allison, G Bekiaris, JD Collier, G Heald, M Meyer, AP Chippendale, A MacLeod, MA Voronkov
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WALLABY Early Science - II. The NGC 7232 galaxy group

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2019)

Authors:

K Lee-Waddell, BS Koribalski, T Westmeier, A Elagali, B-Q For, D Kleiner, JP Madrid, A Popping, TN Reynolds, J Rhee, P Serra, L Shao, L Staveley-Smith, J Wang, MT Whiting, OI Wong, JR Allison, S Bhandari, JD Collier, G Heald, J Marvil, SM Ord
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