Ultra-high energy cosmic rays from shocks in the lobes of powerful radio galaxies
(2018)
Fornax A, Centaurus A and other radio galaxies as sources of ultra-high energy cosmic rays
(2018)
Evidence that particle acceleration in hotspots of FR II galaxies is not constrained by synchrotron cooling
Nuclear and Particle Physics Proceedings 297-299 (2018) 242-248
Abstract:
© 2018 We study the hotspots of powerful radiogalaxies, where electrons accelerated at the jet termination shock emit synchrotron radiation. The turnover of the synchrotron spectrum is typically observed between infrared and optical frequencies, indicating that the maximum energy of non-thermal electrons accelerated at the shock is ≲ TeV for a canonical magnetic field of ∼100 μG. We show that this maximum energy cannot be constrained by synchrotron losses as usually assumed, unless the jet density is unreasonably large and most of the jet upstream energy goes to non-thermal particles. We test this result by considering a sample of hotspots observed at radio, infrared and optical wavelengths.LOFAR 150-MHz observations of SS 433 and W 50
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 475:4 (2018) 5360-5377
On the maximum energy of non-thermal particles in the primary hotspot of Cygnus A
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 473:3 (2018) 3500-3506