Where Centaurus A gets its X-ray knottiness

Details Where Centaurus A gets its X-ray knottiness Where Centaurus A gets its X-ray knottiness

2007-12-20

arxiv.org/abs/0712.3579v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ (Letters)

Scientific paper

10.1086/528681

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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