Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The X-ray Jets of Active Galaxies   Jet physics is again flourishing as a result of Chandra's ability to resolve
high-energy emission from the radio-emitting structures of active galaxies and
separate it from the X-ray-emitting thermal environments of the jets. These
enhanced capabilities have coincided with an increasing interest in the link
between the growth of super-massive black holes and galaxies, and an
appreciation of the likely importance of jets in feedback processes. I review
the progress that has been made using Chandra and XMM-Newton observations of
jets and the medium in which they propagate, addressing several important
questions, including: Are the radio structures in a state of minimum energy? Do
powerful large-scale jets have fast spinal speeds? What keeps jets collimated?
Where and how does particle acceleration occur? What is jet plasma made of?
What does X-ray emission tell us about the dynamics and energetics of radio
plasma/gas interactions? Is a jet's fate determined by the central engine?

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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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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: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: bayes-an