Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of Spectral and Time Variabilities from MCG-2-58-22   We present results from analysis of the X-ray archive data of MCG-2-58-22,
acquired with ROSAT from 1991 to 1993 and with ASCA from 1993 to 1997. By
analyzing light curves, we find that MCG-2-58-22 shows a clear time variability
in X-ray flux. The time scales of the variations range widely from about 1000 s
to more than years. Among the variations, a flare-like event overlaid on the
gradual flux decrease from 1979 to 1993 is detected. We also find clear time
variability of the spectra in the energy range of 0.1 - 2.0 keV. However, the
flux variation does not influences on their spectra in the energy range of 2 -
10 keV. The implications of these observational results are discussed in terms
of a supermassive black hole model and accretion flow dynamics near the central
black hole.

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The categories of this paper are: hep-ph
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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: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th