Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-17
Astronomy and Astrophysics
Astrophysics
TeX, 6 pages, 8 PostScript figures included, using macros lecproc.cmm and epsf.sty, included. To appear in the Proceedings of
Scientific paper
There is good evidence for X-ray emission associated with AGN jets which are relativistically boosted towards the observer. But to what jet radius does such X-ray emission persist? To attempt to answer this question one can look at radio galaxies; their cores are sufficiently X-ray faint that any unbeamed X-ray emission in the vicinity of the central engine must be obscured. The jets of such sources are at unfavourable angles for relativistic boosting, and so their relatively weak X-ray emission must be carefully separated from the plateau of resolved X-ray emission from a hot interstellar, intragroup, or intracluster medium on which they are expected to sit. This paper presents results arguing that jet X-ray emission is generally detected in radio galaxies, even those of low intrinsic power without hot spots. The levels of emission suggest an extrapolated radio to soft X-ray spectral index, alpha_rx, of about 0.85 at parsec to perhaps kiloparsec distances from the cores.
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