Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-energy observations of black hole binaries with the INTEGRAL
  satellite   Black-hole binaries are important sources through which studying accretion
onto compact objects. In the X/gamma-ray domain, these objects show several and
complex spectral behaviours and transitions. Based on INTEGRAL observations
collected during the last eightyears, we have now a new view on the high energy
emission of black-hole binary. An additional component above 200 keV has been
observed in a few systems, during either hard/intermediate or low/hard states.
The nature of this hard-tail is still debated, as also the one observed in soft
states. However, among a number of models, it is usually attributed to the
presence of a small fraction of non-thermal electrons in a hot-Comptonising
plasma. I review the high energy emission from black hole binary systems and
report on some INTEGRAL observations of three different objects: 1E
1740.7-2942, GX 339-4, Cyg X-1.

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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg