Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarimetry and the High-Energy Emission Mechanisms in Quasar Jets   The emission mechanisms in extragalactic jets include synchrotron and various
inverse-Compton processes. At low (radio through infrared) energies, it is
widely agreed that synchrotron emission dominates in both low-power (FR I) and
high-power (FR II and quasar) jets, because of the power-law nature of the
spectra observed and high polarizations. However, at higher energies, the
emission mechanism for high-power jets at kpc scales is hotly debated. Two
mechanisms have been proposed: either inverse-Compton of cosmic microwave
background photons or synchrotron emission from a second, high-energy
population of electrons. Here we discuss optical polarimetry as a method for
diagnosing the mechanism for the high-energy emission in quasar jets, as well
as revealing the jet's three-dimensional energetic and magnetic field
structure. We then discuss high-energy emission mechanisms for powerful jets in
the light of the HST polarimetry of PKS 1136-135.

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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph