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.Comment: TeX, 6 pages, 8 PostScript figures included, using macros lecproc.cmm
and epsf.sty, included. To appear in the Proceedings of the Conference
``Relativistic Jets in AGNs'', Cracow, May 199
