Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reflection dominated X-ray spectra of Narrow Line Seyfert 1 Galaxies:
  Mrk 478 and EXO 1346.2+2645   Multi-epoch XMM-Newton spectra of the two Narrow Line Seyfert 1 (NLS1), Mrk
478 and EXO 1346.2+2645, are presented. The data were fitted with different
models, including the relativistically-blurred reflection model reflionx, which
was found to give a good description of both spectra in all epochs. The two
sources are reflection dominated with the illuminating continuum hidden from
view. This can be explained either in terms of a corrugated disc or strong
gravitational light bending effects. The emission from these two sources comes
from a very small region (few gravitational radii), very close to a rapidly
spinning black hole.
  Spectral variability analysis show that both sources have constant RMS
spectra, and constant hardness ratios in all epochs, in agreement with a single
spectral component. The constancy the spectrum between high and low states
rules out alternative models such as partial covering.

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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int