Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A first XMM-Newton look at the most X-ray-luminous galaxy cluster RX
  J1347.5-1145   We present the first results from an XMM-Newton observation of RX
J1347.5-1145 (z=0.451), the most luminous X-ray cluster of galaxies currently
known, with a luminosity L_X = 6.0 \pm 0.1 \times 10^{45} erg/s in the [2-10]
keV energy band. The cluster has an overall temperature of kT=10.0 \pm 0.3 keV
and is not isothermal: the temperature profile shows a decline in the outer
regions and a drop in the centre, indicating the presence of a cooling core.
The spectral analysis identifies a hot region at radii 50-200 kpc to south-east
of the main X-ray peak, at a position consistent with the subclump seen in the
X-ray image. Excluding the data of the south-east quadrant, the cluster appears
relatively relaxed and we estimate a total mass within 1 Mpc of 1.0 \pm 0.2
\times 10^{15} M_sun.

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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph