Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monitoring the Bi-Directional Relativistic Jets of the Radio Galaxy 3C
  338   We present the analysis of VLA and VLBA observations of the radio source 3C
338, associated with the cD galaxy NGC 6166, the central dominant galaxy of the
cluster Abell 2199. The VLBA observations were done at 8.4 and 15.4 GHz, while
the VLA observations were performed at 0.074, 0.330, and 8.4 GHz. The
milliarcsecond resolution VLBA data, spanning 7 years, reveal the parsec-scale
jets, whose kinematics and orientation cannot be unambiguously derived. Based
on the observed morphology, jet/counter-jet length ratio, flux density ratio,
and proper motions of the jet components, we consider two possible
explanations: either the jets are strongly relativistic and lie within 10 - 20
degrees of the plane of the sky, or they are only mildly relativistic, and are
pointing at an angle between 30 - 50 degrees from the plane of the sky. The
arcsecond resolution VLA data enable us to investigate the large scale
structure of the radio source. The morphology of the low frequency radio lobes
clearly indicates that they are associated with the cavities present in the
X-ray emission. Low frequency observations also reveal an extension to the
south corresponding to an X-ray hole. The age of these bubbles, computed from
the sound speed, the buoyancy time and the radiative age are all in fair
agreement with each other. Estimates of the power necessary to inflate these
cavities suggest that the accretion power onto the central engine has not been
constant over time.

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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
3
The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: econ