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Relativistic Jet from Black Hole

An artist's impression of a relativistic jet propagating away from a black hole at close to the speed of light. Such jets are formed by the inner regions of the accretion flow: matter flowing inwards towards the black hole, via processes which are not yet fully understood. The accretion flow emits primarily in X-rays, the relativistic jet in the radio band: by combing observations in each band we can try and understand how such jets form and how much energy they carry away from the black hole.

Professor Rob Fender

Professor of Astrophysics

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Hintze Centre for Astrophysical Surveys
  • MeerKAT
  • Pulsars, transients and relativistic astrophysics
  • Rubin-LSST
  • The Square Kilometre Array (SKA)
  • Gamma-ray astronomy
Rob.Fender@physics.ox.ac.uk
Telephone: 01865 (2)73435
Denys Wilkinson Building, room 712
  • About
  • Publications

Fast infrared variability from the black hole candidate MAXI J1535−571 and tight constraints on the modelling

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 503:1 (2021) 614-624

Authors:

FM Vincentelli, P Casella, DM Russell, MC Baglio, A Veledina, T Maccarone, J Malzac, R Fender, K O’Brien, P Uttley
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Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-Timing Analysis

(2021)

Authors:

Jingyi Wang, Guglielmo Mastroserio, Erin Kara, Javier García, Adam Ingram, Riley Connors, Michiel van der Klis, Thomas Dauser, James Steiner, Douglas Buisson, Jeroen Homan, Matteo Lucchini, Andrew Fabian, Joe Bright, Rob Fender, Edward Cackett, Ron Remillard
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An early peak in the radio light curve of short-duration gamma-ray burst 200826A

Monthly Notices of the Royal Astronomical Society Oxford University Press 503:2 (2021) 2966-2972

Authors:

Lauren Rhodes, Robert Fender, David RA Williams, Kunal Mooley

Abstract:

We present the results of radio observations from the eMERLIN telescope combined with X-ray data from Swift for the short-duration gamma-ray burst (GRB) 200826A, located at a redshift of 0.71. The radio light curve shows evidence of a sharp rise, a peak around 4–5 d post-burst, followed by a relatively steep decline. We provide two possible interpretations based on the time at which the light curve reached its peak. (1) If the light curve peaks earlier, the peak is produced by the synchrotron self-absorption frequency moving through the radio band, resulting from the forward shock propagating into a wind medium and (2) if the light curve peaks later, the turnover in the light curve is caused by a jet break. In the former case we find a minimum equipartition energy of ∼3 × 1047 erg and bulk Lorentz factor of ∼5, while in the latter case we estimate the jet opening angle of ∼9–16°. Due to the lack of data, it is impossible to determine which is the correct interpretation, however due to its relative simplicity and consistency with other multiwavelength observations which hint at the possibility that GRB 200826A is in fact a long GRB, we prefer the scenario one over scenario two.
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Very low-frequency oscillations from the 11 Hz pulsar in Terzan 5: frame dragging back on the table.

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 502:4 (2021) 5472-5479

Authors:

L du Buisson, S Motta, R Fender
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An early peak in the radio light curve of short-duration Gamma-Ray Burst 200826A

(2021)

Authors:

Lauren Rhodes, Rob Fender, David RA Williams, Kunal Mooley
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