Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fourier resolved spectroscopy of 4U 1543-47 during the 2002 outburst   We have obtained Fourier-resolved spectra of the black-hole binary 4U 1543-47
in the canonical states (high/soft, very high, intermediate and low/hard)
observed in this source during the decay of an outburst that took place in
2002. Our objective is to investigate the variability of the spectral
components generally used to describe the energy spectra of black-hole systems,
namely a disk component, a power-law component attributed to Comptonization by
a hot corona and the contribution of the iron line due to reprocessing of the
high energy (E > 7 keV) radiation. We find that i) the disk component is not
variable on time scales shorter than ~100 seconds, ii) the reprocessing
emission as manifest by the variability of the Fe Kalpha line responds to the
primary radiation variations down to time scales of ~70 ms in the high and
very-high states, but longer than 2 s in the low state, iii) the low-frequency
QPOs are associated with variations of the X-ray power law spectral component
and not to the disk component and iv) the spectra corresponding to the highest
Fourier frequency are the hardest
  (show the flatter spectra) at a given spectral state. These results question
models that explain the observed power spectra as due to modulations of the
accretion rate alone, as such models do not provide any apparent reason for a
Fourier frequency dependence of the power law spectral indices.

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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: math
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc