Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Suzaku Observations of Cyg X-1   We present highlights from a series of four simultaneous Suzaku/RXTE
observations of the black hole candidate Cyg X-1. We briefly summarize several
key results from our decade long RXTE monitoring campaign. We then comment on
challenges of analyzing the Suzaku data, i.e., improving the aspect correction
beyond that of the existing tools, and quantitatively assessing pileup. All of
our Suzaku observations (one, by design) occurred at or very near orbital phase
0 (superior conjunction), and hence show evolution in color-color diagrams due
to X-ray absorption by material from the wind of the secondary. We present
simple partial absorption models for this evolution. We then compare the Suzaku
and RXTE data, and explicitly divide the Fe line region into narrow and broad
components. Both are required for the Suzaku data, and are seen to be
consistent with the RXTE data. These Suzaku observations occurred near
historically hard, low flux states. We present fits of the broad band spectra
with a simple phenomenological broken powerlaw model, as well as a more
physically motivated Comptonization model. Whereas the former class of models
described nearly all of the RXTE campaign better than any physical model, here
the latter model is slightly more successful. The Comptonization model,
however, exhibits little evidence for a soft disk component, which formally
corresponds to a small, inner disk radius. Whether this is physical, due to
unmodeled absorption, or is a calibration issue, remains an open question.

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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess