Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Cluster Associated with the z=1.063 CSS Quasar 3C 186: The Jet is
  NOT Frustrated   We report the Chandra discovery of an X-ray cluster at redshift z = 1.063
associated with the Compact Steep Spectrum radio loud quasar 3C 186
(Q0740+380). Diffuse X-ray emission is detected out to ~120 kpc from the quasar
and contains 741+/-40 net counts. The X-ray spectrum of the extended emission
shows strong Fe-line emission (EW=412eV) at the quasar redshift and confirms
the thermal nature of this diffuse component. We measure a cluster temperature
of 5.2(+1.2/-0.9) keV and an X-ray luminosity L(0.5-2 keV) ~ 6e44 erg/sec,
which are in agreement with the luminosity-temperature relation for
high-redshift clusters. This is the first detection of a bright X-ray cluster
around a luminous (L_bol ~1e47 erg/sec) CSS quasar at high redshift and only
the fifth z>1 X-ray cluster detected. We find that the CSS radio source is
highly overpressured with respect to the thermal cluster medium by about 3
orders of magnitude. This provides direct observational evidence that the radio
source is not thermally confined as posited in the ``frustrated'' scenario for
CSS sources. Instead, it appears that the radio source may be young and we are
observing it at an early stage of its evolution. In that case the radio source
could supply the energy into the cluster and potentially prevent its cooling.

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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: physics