Browsing Research publications by Author "Wykes, Sarka"

Now showing items 1-5 of 5

    • A 1D fluid model of the Centaurus A jet 

      Wykes, Sarka; Snios, Bradford T.; Nulsen, Paul E. J.; Kraft, Ralph P.; Birkinshaw, Mark; Hardcastle, Martin J.; Worrall, Diana M.; McDonald, Iain; Rejkuba, Marina; Jones, Thomas W.; Stark, David J.; Forman, William R.; Meyer, Eileen T.; Jones, Christine (2019-05-01)
      We implement a steady, one-dimensional flow model for the X-ray jet of Centaurus A in which entrainment of stellar mass loss is the primary cause of dissipation. Using over 260 ks of new and archival Chandra/ACIS data, we ...

    • Centaurus A: constraints on the nature of the giant lobe filaments from XMM-Newton observations 

      Wykes, Sarka; Hardcastle, M.J.; Croston, J. H. (2015-12-11)
      We report on deep XMM-Newton observations of the vertex filament in the southern giant lobe of the Fanaroff-Riley class I radio galaxy Centaurus A. We find no X-ray excess from the filament region and place a 3 sigma upper ...

    • Filaments in the southern giant lobe of Centaurus A : Constraints on nature and origin from modelling and GMRT observations 

      Wykes, Sarka; Intema, Huib T.; Hardcastle, M.J.; Achterberg, Abraham; Jones, Thomas W.; Jerjen, Helmut; Orrú, Emanuela; Lazarian, Alex; Shimwell, Timothy W.; Wise, Michael W.; Kronberg, Philipp P. (2014-08-21)
      We present results from imaging of the radio filaments in the southern giant lobe of CentaurusA using data from Giant Metrewave Radio Telescope observations at 325 and 235 MHz, and outcomes from filament modelling. The ...

    • Internal entrainment and the origin of jet-related broad-band emission in Centaurus A 

      Wykes, Sarka; Hardcastle, M.J.; Karakas, Amanda I.; Vink, Jorick S. (2015-02-11)
      The dimensions of Fanaroff-Riley class I jets and the stellar densities at galactic centres imply that there will be numerous interactions between the jet and stellar winds. These may give rise to the observed diffuse and ...

    • Variability and Proper Motion of X-ray Knots in the Jet of Centaurus A 

      Snios, Bradford; Wykes, Sarka; Nulsen, Paul E. J.; Kraft, Ralph P.; Meyer, Eileen T.; Birkinshaw, Mark; Worrall, Diana M.; Hardcastle, Martin J.; Roediger, Elke; Forman, William R.; Jones, Christine (2019-02-05)
      We report results from Chandra observations analyzed for evidence of variability and proper motion in the X-ray jet of Centaurus A. Using data spanning 15 yr, collective proper motion of 11.3 ± 3.3 mas yr -1 , or 0.68 ± ...