Browsing by Author "Dicken, D."

Now showing items 1-7 of 7

    • Clear detection of dusty torus signatures in a weak-line radio galaxy: the case of PKS 0043-42 

      Almeida, C. Ramos; Dicken, D.; Tadhunter, C.; Asensio Ramos, A.; Inskip, K. J.; Hardcastle, M.J.; Mingo, B. (2011-06)
      We report the clearest detection to date of dusty torus signatures in a weak-line radio galaxy (WLRG). The deep Spitzer InfraRed Spectrograph (IRS) rest-frame mid-infrared (MIR) spectrum of the WLRG PKS 0043-42 (z = 0.116) ...

    • A large-scale shock surrounding a powerful radio galaxy? 

      Croston, J.H.; Hardcastle, M.J.; Mingo, B.; Evans, D.A.; Dicken, D.; Morganti, R.; Tadhunter, C.N. (2011)
      We report Chandra evidence for a 200 kpc scale shock in the cluster surrounding the powerful radio galaxy 3C444. Our 20 ks observation allows us to identify a clear surface brightness drop around the outer edge of the radio ...

    • Spitzer MID-IR spectroscopy of powerful 2Jy and 3CRR radio galaxies. II : Agn power indicators and unification 

      Dicken, D.; Tadhunter, C.; Morganti, R.; Robinson, A.; Magagnoli, M.; Kharb, P.; Ramos Almeida, C.; Mingo, B.; Hardcastle, M.J.; Nesvadba, N. P. H.; Singh, V.; Kouwenhoven, M. B. N.; Rose, M.; Spoon, H.; Inskip, K. J.; Holt, J. (2014-06-20)
      It remains uncertain which continuum and emission line diagnostics best indicate the bolometric powers of active galactic nuclei (AGNs), especially given the attenuation caused by the circumnuclear material and the possible ...

    • Star formation in quasar hosts and the origin of radio emission in radio-quiet quasars 

      Zakamska, N.~L.; Lampayan, K.; Petric, A.; Dicken, D.; Greene, J.~E.; Heckman, T.~M.; Hickox, R.~C.; Ho, L.~C.; Krolik, J.~H.; Nesvadba, N.~P.~H.; Strauss, M.~A.; Geach, J.~E.; Oguri, M.; Strateva, I.~V. (2016-02-01)
      Radio emission from radio-quiet quasars may be due to star formation in the quasar host galaxy, to a jet launched by the supermassive black hole, or to relativistic particles accelerated in a wide-angle radiatively driven ...

    • Very Large Baseline Array observations of Mrk 6 : probing the jet-lobe connection 

      Kharb, P.; O'Dea, C.P.; Baum, S.A.; Hardcastle, M.J.; Dicken, D.; Croston, J. H.; Mingo, B.; Noel-Storr, J. (2014-06-01)
      We present the results of high-resolution VLBI (very long baseline interferometry) observations at 1.6 and 4.9 GHz of the radio-loud Seyfert galaxy, Mrk 6. These observations are able to detect a compact radio core in this ...

    • An X-ray survey of the 2 Jy sample - II. X-ray emission from extended structures 

      Mingo, B.; Hardcastle, M. J.; Ineson, J.; Mahatma, V.; Croston, J. H.; Dicken, D.; Evans, D. A.; Morganti, R.; Tadhunter, C.N. (2017-09-21)
      The 2 Jy sample is a survey of radio galaxies with flux densities above 2 Jy at 2.7 GHz. As part of our ongoing work on the southern subset of 2 Jy sources, in paper I of this series we analysed the X-ray cores of the ...

    • An X-ray survey of the 2 Jy sample-I : Is there an accretion mode dichotomy in radio-loud AGN? 

      Mingo, B.; Hardcastle, M.J.; Croston, J.H.; Dicken, D.; Evans, D. A.; Morganti, R.; Tadhunter, C. (2014-05-01)
      We carry out a systematic study of the X-ray emission from the active nuclei of the 0.02 < z< 0.7 2 Jy sample, using Chandra and XMM-Newton observations.We combine our results with those from mid-infrared, optical emission-line ...