Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pulsed thermal emission from the accreting pulsar XMMU J054134.7-682550   Aims. Soft X-ray excesses have been detected in several Be/X-ray binaries and
interpreted as the signature of hard X-ray reprocessing in the inner accretion
disk. The system XMMU J054134.7-682550, located in the LMC, featured a giant
Type II outburst in August 2007. The geometry of this system can be understood
by studying the response of the soft excess emission to the hard X-ray pulses.
  Methods. We have analyzed series of simultaneous observations obtained with
XMM-Newton/EPIC-MOS and RXTE/PCA in order to derive spectral and temporal
characteristics of the system, before, during and after the giant outburst.
Spectral fits were performed and a timing analysis has been carried out.
Spectral variability, spin period evolution and energy dependent pulse shapes
are analysed.
  Results. The outburst (L_X = 3* 10^38 erg/s \approx L_EDD) spectrum could be
modeled successfully using a cutoff powerlaw, a cold disk emission, a hot
blackbody, and a cyclotron absorption line. The magnetic field and
magnetospheric radius could be constrained. The thickness of the inner
accretion disk is broadened to a width of 75 km. The hot blackbody component
features sinusoidal modulations indicating that the bulk of the hard X-ray
emission is emitted preferentially along the magnetic equator. The spin period
of the pulsar decreased very significantly during the outburst. This is
consistent with a variety of neutron star equations of state and indicates a
very high accretion rate.

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The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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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: bayes-an
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The categories of this paper are: alg-geom