Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: XMM-Newton observation of the distant (z=0.6) galaxy cluster RX
  J1120.1+4318   We report on a 20 ksec XMM observation of the distant cluster RXJ1120.1+4318,
discovered at z=0.6 in the SHARC survey. The cluster has a regular spherical
morphology, suggesting it is in a relaxed state. The combined fit of the
EPIC/MOS&pn camera gives a cluster mean temperature of kT=5.3\pm0.5 keV with an
iron abundance of 0.47\pm0.19. The temperature profile, measured for the first
time at such a redshift, is consistent with an isothermal atmosphere up to half
the virial radius. The surface brightness profile, measured nearly up to the
virial radius, is well fitted by a beta-model, with beta =0.78[+0.06,-0.04] and
a core radius of thetac = 0.44[+0.06,-0.04] arcmin. We compared the properties
of RXJ1120.1+4318 with the properties of nearby clusters for two cosmological
models: an Einstein - de Sitter Universe and a flat low density Universe with
Omega0=0.3. For both models, the scaled emission measure profile beyond the
core, the gas mass fraction and luminosity are consistent with the expectations
of the self-similar model of cluster formation, although a slightly better
agreement is obtained for a low density Universe. There is no evidence of a
central cooling flow, in spite of the apparent relaxed state of the cluster.
This is consistent with its estimated cooling time, larger than the age of the
Universe at the cluster redshift. The entropy profile shows a flat core with a
central entropy of ~ 140 keV cm^2, remarkably similar to the entropy floor
observed in nearby clusters, and a rising profile beyond typically 0.1 virial
radius. Implications of our results, in terms of non-gravitational physics in
cluster formation, are discussed.

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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: alg-geom