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Where Centaurus A gets its X-ray knottiness

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arxiv 0712.3579 v1 pith:Y2HEJ46Y submitted 2007-12-20 astro-ph

D.M. Worrall , M. Birkinshaw , R.P. Kraft , G.R. Sivakoff , A. Jordan , M.J. Hardcastle , N.J. Brassington , J.H. Croston
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D.A. Evans W.R. Forman W.E. Harris C. Jones A.M. Juett S.S. Murray P.E.J. Nulsen S. Raychaudhury C.L. Sarazin K.A. Woodley
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keywords axiscentaurusdistanceemissionknotknotsspectralspectrum
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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.

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