Pulsars, transients and relativistic astrophysics

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Cosmic Ray Acceleration in Hydromagnetic Flux Tubes

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

Authors:

Anthony BELL, James Matthews, Katherine Blundell, Anabella Araudo

Abstract:

We find that hydromagnetic flux tubes in back-flows in the lobes of radio galaxies offer a suitable environment for the acceleration of cosmic rays (CR) to ultra-high energies. We show that CR can reach the Hillas (1984) energy even if the magnetised turbulence in the flux tube is not sufficiently strong for Bohm diffusion to apply. First-order Fermi acceleration by successive weak shocks in a hydromagnetic flux tube is shown to be equivalent to second-order Fermi acceleration by strong turbulence.
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Cosmic ray acceleration in hydromagnetic flux tubes

Monthly Notices of the Royal Astronomical Society Oxford University Press 487:4 (2019) 4571-4579

Authors:

AR Bell, James Matthews, Katherine M Blundell, AT Araudo

Abstract:

We find that hydromagnetic flux tubes in back-flows in the lobes of radio galaxies offer a suitable environment for the acceleration of cosmic rays (CR) to ultra-high energies. We show that CR can reach the Hillas (1984) energy even if the magnetized turbulence in the flux tube is not sufficiently strong for Bohm diffusion to apply. First-order Fermi acceleration by successive weak shocks in a hydromagnetic flux tube is shown to be equivalent to second-order Fermi acceleration by strong turbulence.
More details
More details from the publisher
Details from ORA
More details
Details from ArXiV

A rapidly-changing jet orientation in the stellar-mass black hole V404 Cygni

(2019)

Authors:

James CA Miller-Jones, Alexandra J Tetarenko, Gregory R Sivakoff, Matthew J Middleton, Diego Altamirano, Gemma E Anderson, Tomaso M Belloni, Rob P Fender, Peter G Jonker, Elmar G Körding, Hans A Krimm, Dipankar Maitra, Sera Markoff, Simone Migliari, Kunal P Mooley, Michael P Rupen, David M Russell, Thomas D Russell, Craig L Sarazin, Roberto Soria, Valeriu Tudose
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Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070

(2019)

Authors:

T Muñoz-Darias, F Jiménez-Ibarra, G Panizo-Espinar, J Casares, D Mata Sánchez, G Ponti, RP Fender, DAH Buckley, P Garnavich, MAP Torres, M Armas Padilla, PA Charles, JM Corral-Santana, JJE Kajava, EJ Kotze, C Littlefield, J Sánchez-Sierras, D Steeghs, J Thomas
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ALMA observations of A0620-00: fresh clues on the nature of quiescent black hole X-ray binary jets

(2019)

Authors:

Elena Gallo, Richard Teague, Richard M Plotkin, James CA Miller-Jones, David M Russell, Tolga Dinçer, Charles Bailyn, Thomas J Maccarone, Sera Markoff, Rob P Fender
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