Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical modelling of the lobes of radio galaxies in cluster
  environments - III. Powerful relativistic and nonrelativistic jets   We present results from two suites of simulations of powerful radio galaxies
in poor cluster environments, with a focus on the formation and evolution of
the radio lobes. One suite of models uses relativistic hydrodynamics and the
other relativistic magnetohydrodynamics; both are set up to cover a range of
jet powers and velocities. The dynamics of the lobes are shown to be in good
agreement with analytical models and with previous numerical models, confirming
in the relativistic regime that the observed widths of radio lobes may be
explained if they are driven by very light jets. The ratio of energy stored in
the radio lobes to that put into the intracluster gas is seen to be the same
regardless of jet power, jet velocity or simulation type, suggesting that we
have a robust understanding of the work done on the ambient gas by this type of
radio source. For the most powerful jets we at times find magnetic field
amplification by up to a factor of two in energy, but mostly the magnetic
energy in the lobes is consistent with the magnetic energy injected. We confirm
our earlier result that for jets with a toroidally injected magnetic field, the
field in the lobes is predominantly aligned with the jet axis once the lobes
are well developed, and that this leads to radio flux anisotropies of up to a
factor of about two for mature sources. We reproduce the relationship between
151-MHz luminosity and jet power determined analytically in the literature.

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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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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: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: eess