Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Magnetic Field in Quasar and FR II Large-Scale Jets   Here we report systematic comparison of the spectral properties of
large-scale jets, hotspots and extended lobes in quasars and FR II radio
galaxies recently observed with Chandra and ASCA. We argue that if the strong
X-ray emission of the jet knots in these objects results from comptonisation of
the CMB photons, as usually considered, the powerful large-scale jets are most
likely far from the minimum-power condition in the sense that the magnetic
field thereby is below equipartition. We also show that the X-ray emission of
the hot-spots and lobes in the compiled dataset agrees with the minimum-power
condition. In this context, we point out the need for substantial amplification
of the magnetic field within the terminal shocks of powerful large-scale jets
of quasars and FR II sources.

2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: physics
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
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The categories of this paper are: stat