Where centaurus a gets its X-ray knottiness

DM Worrall, M Birkinshaw, RP Kraft, GR Sivakoff, A Jordan, MJ Hardcastle, NJ Brassington, JH Croston, DA Evans, WR Forman, WE Harris, C Jones, AM Juett, SS Murray, PEJ Nulsen, Somak Raychaudhury, CL Sarazin, KA Woodley

Research output: Contribution to journalArticle

30 Citations (Scopus)


We report an X-ray spectral study of the transverse structure of the Centaurus A jet using new data from the Chandra Cen A Very Large Project. We find that the spectrum steepens with increasing distance from the jet axis, and that this steepening can be attributed to a change in the average spectrum of the knotty emission. Such a trend is unexpected if the knots are predominantly a surface feature residing in a shear layer between faster and slower flows. We suggest that the spectral steepening of the knot emission as a function of distance from the jet axis is due to knot migration, implying a component of transverse motion of knots within the flow.
Original languageEnglish
Pages (from-to)L135-L138
JournalThe Astrophysical Journal
Issue number2
Publication statusPublished - 1 Jan 2008


  • galaxies : individual (Centaurus A, NGC 5128)
  • X-rays : galaxies
  • galaxies : active
  • galaxies : jets


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