Browsing by Author "Croston, Judith H."

Now showing items 1-4 of 4

    • FR II radio galaxies at low frequencies I : morphology, magnetic field strength and energetics 

      Harwood, Jeremy J.; Croston, Judith H.; Intema, Huib T.; Stewart, Adam J.; Ineson, Judith; Hardcastle, Martin; Godfrey, Leith; Best, Philip; Brienza, Marisa; Heesen, Volker; Mahony, Elizabeth K.; Morganti, Raffaella; Murgia, Matteo; Orrú, Emanuela; Röttgering, Huub; Shulevski, Aleksandar; Wise, Michael W. (2016-06-01)
      Due to their steep spectra, low-frequency observations of FR II radio galaxies potentially provide key insights in to the morphology, energetics and spectrum of these powerful radio sources. However, limitations imposed ...

    • FR-II radio galaxies at low frequencies II: spectral ageing and source dynamics 

      Harwood, Jeremy J.; Hardcastle, Martin J.; Morganti, Raffaella; Croston, Judith H.; Brüggen, Marcus; Brunetti, Gianfranco; Röttgering, Huub J. A.; Shulevski, Aleksander; White, Glenn J. (2017-07-01)
      In this paper, the second in a series investigating FR II radio galaxies at low frequencies, we use LOFAR and VLA observations between 117 and 456 MHz in addition to archival data to determine the dynamics and energetics ...

    • Investigating the spectral age problem with powerful radio galaxies 

      Mahatma, Vijay H.; Hardcastle, Martin J.; Croston, Judith H.; Harwood, Jeremy; Ineson, Judith; Moldon, Javier (2020-02-01)
      The 'spectral age problem' is our systematic inability to reconcile the maximum cooling time of radiating electrons in the lobes of a radio galaxy with its age as modelled by the dynamical evolution of the lobes. While ...

    • A representative survey of the dynamics and energetics of FRII radio galaxies 

      Ineson, Judith; Croston, Judith H.; Hardcastle, Martin; Mingo, Beatriz (2017-05-01)
      We report the first large, systematic study of the dynamics and energetics of a representative sample of FRII radio galaxies with well-characterized group/cluster environments. We used X-ray inverse-Compton and radio ...