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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 and Head 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

Discovery of optical and infrared accretion disc wind signatures in the black hole candidate MAXI J1348-630

ASTRONOMY & ASTROPHYSICS 664 (2022) ARTN A100

Authors:

G Panizo-Espinar, M Armas Padilla, T Munoz-Darias, KII Koljonen, VA Cuneo, J Sanchez-Sierras, D Mata Sanchez, J Casares, J Corral-Santana, RP Fender, F Jimenez-Ibarra, G Ponti, D Steeghs, MAP Torres
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VLBI observations of GRB 201015A, a relatively faint GRB with a hint of very high-energy gamma-ray emission

ASTRONOMY & ASTROPHYSICS 664 (2022) ARTN A36

Authors:

S Giarratana, L Rhodes, B Marcote, R Fender, G Ghirlanda, M Giroletti, L Nava, JM Paredes, ME Ravasio, M Ribo, M Patel, J Rastinejad, G Schroeder, W Fong, BP Gompertz, AJ Levan, P O'Brien
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A Late-time Radio Flare Following a Possible Transition in Accretion State in the Tidal Disruption Event AT 2019azh

ASTROPHYSICAL JOURNAL 933:2 (2022) ARTN 176

Authors:

Itai Sfaradi, Assaf Horesh, Rob Fender, David A Green, David RA Williams, Joe Bright, Steve Schulze
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Discovery of a radio emitting neutron star with an ultra-long spin period of 76 seconds.

Nature astronomy 6:7 (2022) 828-836

Authors:

Manisha Caleb, Ian Heywood, Kaustubh Rajwade, Mateusz Malenta, Benjamin Stappers, Ewan Barr, Weiwei Chen, Vincent Morello, Sotiris Sanidas, Jakob van den Eijnden, Michael Kramer, David Buckley, Jaco Brink, Sara Elisa Motta, Patrick Woudt, Patrick Weltevrede, Fabian Jankowski, Mayuresh Surnis, Sarah Buchner, Mechiel Christiaan Bezuidenhout, Laura Nicole Driessen, Rob Fender

Abstract:

The radio-emitting neutron star population encompasses objects with spin periods ranging from milliseconds to tens of seconds. As they age and spin more slowly, their radio emission is expected to cease. We present the discovery of an ultra-long period radio-emitting neutron star, PSR J0901-4046, with spin properties distinct from the known spin and magnetic-decay powered neutron stars. With a spin-period of 75.88 s, a characteristic age of 5.3 Myr, and a narrow pulse duty-cycle, it is uncertain how radio emission is generated and challenges our current understanding of how these systems evolve. The radio emission has unique spectro-temporal properties such as quasi-periodicity and partial nulling that provide important clues to the emission mechanism. Detecting similar sources is observationally challenging, which implies a larger undetected population. Our discovery establishes the existence of ultra-long period neutron stars, suggesting a possible connection to the evolution of highly magnetized neutron stars, ultra-long period magnetars, and fast radio bursts.
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The science case and challenges of space-borne sub-millimeter interferometry

ACTA ASTRONAUTICA 196 (2022) 314-333

Authors:

Leonid I Gurvits, Zsolt Paragi, Ricardo I Amils, Ilse van Bemmel, Paul Boven, Viviana Casasola, John Conway, Jordy Davelaar, M Carmen Diez-Gonzalez, Heino Falcke, Rob Fender, Sandor Frey, Christian M Fromm, Juan D Gallego-Puyol, Cristina Garcia-Miro, Michael A Garrett, Marcello Giroletti, Ciriaco Goddi, Jose L Gomez, Jeffrey van der Gucht, Jose Carlos Guirado, Zoltan Haiman, Frank Helmich, Ben Hudson, Elizabeth Humphreys, Violette Impellizzeri, Michael Janssen, Michael D Johnson, Yuri Y Kovalev, Michael Kramer, Michael Lindqvist, Hendrik Linz, Elisabetta Liuzzo, Andrei P Lobanov, Isaac Lopez-Fernandez, Inmaculada Malo-Gomez, Kunal Masania, Yosuke Mizuno, Alexander V Plavin, Raj T Rajan, Luciano Rezzolla, Freek Roelofs, Eduardo Ros, Kazi LJ Rygl, Tuomas Savolainen, Karl Schuster, Tiziana Venturi, Marjolein Verkouter, Pablo de Vicente, Pieter NAM Visser, Martina C Wiedner, Maciek Wielgus, Kaj Wiik, J Anton Zensus
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