Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: PCA of the spectral energy distribution and emission line properties of
  red 2MASS AGN   We analyze the spectral energy distributions (SEDs) and emission line
properties of the red (J-K$_S$ > 2) 2MASS AGN observed by Chandra using
principle component analysis. The sample includes 44 low redshift AGN with low
or moderate obscuration (N_H < 10^{23} cm^{-2}) as indicated by X-rays and SED
modeling. The obscuration of the AGN allows us to see weaker emission
components (host galaxy emission, AGN scattered light) which are usually
outshone by the AGN. The first four eigenvectors explain 70% of the variance in
the sample. The dominant cause of variance in the sample (eigenvector 1) is the
L/Ledd ratio strengthened by intrinsic absorption. Eigenvector 2 is related to
host galaxy (relative to the observed AGN) emission and eigenvectors 3 and 4
distinguish between two sources of obscuration: host galaxy absorption and
circumnuclear absorption. Although our analysis is consistent with unification
schemes where inclination dependent obscuration is important in determining the
AGN SEDs, the L/Ledd ratio is the most important factor, followed by host
galaxy emission.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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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: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat