Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A combined model for the X-ray to gamma-ray emission of Cyg X-1   We use recent data obtained by three (OSSE, BATSE, and COMPTEL) of four
instruments on board the Compton Gamma Ray Observatory, to construct a model of
Cyg X-1 which describes its emission in a broad energy range from soft X-rays
to MeV gamma-rays self-consistently. The gamma-ray emission is interpreted to
be the result of Comptonization, bremsstrahlung, and positron annihilation in a
hot optically thin and spatially extended region surrounding the whole
accretion disk. For the X-ray emission a standard corona-disk model is applied.
We show that the Cyg X-1 spectrum accumulated by the CGRO instruments during a
~4 year time period between 1991 and 1995, as well as the HEAO-3 gamma1 and
gamma2 spectra can be well represented by our model. The derived parameters
match the observational results obtained from X-ray measurements.

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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
3
The categories of this paper are: physics
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The categories of this paper are: hep-th
35
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: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: econ