Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A high-energy view of radio-loud AGN   Seyfert galaxies and quasars were first discovered through optical and radio
techniques, but in recent years high-energy emission, that can penetrate
central gas and dust, has become essentially the defining characteristic of an
AGN. AGNs with extended radio jets are of particular interest, since the jets
signal source orientation. However, the jets extend into the cores, where they
are faster and more compact. Special-relativistic effects then cause jet
brightness and variability time-scales across the electromagnetic spectrum to
be strong functions of jet orientation. Jet X-ray emission is confused, to
varying degrees, with that from the central engine, but can be measured, at
least in a statistical sense, through considerations of the multiwaveband
spectrum and the level of intrinsic absorption. The rich high-energy structures
found in jets which are resolved with Chandra inform our interpretation of the
inner structures. In particular, it is found that shocks are prevalent and
don't necessarily disrupt jets, and that one-zone models of emission near
shocks are an over-simplification.

1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an