Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband Spectrum of the X-ray Binary M33 X-6 from NuSTAR and Swift-XRT
  Data: An Extragalactic Z-Source?   We present the results of our study of the X-ray spectrum for the source X-6
in the nearby galaxy M33 obtained for the first time at energies above 10 keV
from the data of the NuSTAR orbital telescope. The archival Swift-XRT data for
energy coverage below 3 keV have been used, which has allowed the spectrum of
M33 X-6 to be constructed in the wide energy range 0.3-20 keV. The spectrum of
the source is well described by the model of an optically and geometrically
thick accretion disk with a maximum temperature of ~2 keV and an inner radius
of ~5 cos^{-1/2}(theta) km (where "theta" is the unknown disk inclination angle
with respect to the observer). There is also evidence for the presence of an
additional hard component in the spectrum. The X-ray luminosity of M33 X-6
measured for the first time in the wide energy range 0.3-20 keV is ~2*10^{38}
erg/s , with the luminosity in the hard 10-20 keV X-ray band being ~10% of the
source's total luminosity. The results obtained suggest that X-6 may be a
Z-source, i.e., an X-ray binary with subcritical accretion onto a weakly
magnetized neutron star.

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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas