Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for an intermediate line region in AGN's inner torus region and
  its evolution from narrow to broad line Seyfert I galaxies   A two-components model for Broad Line Region (BLR) of Active Galactic Nuclei
(AGN) has been suggested for many years but not widely accepted (e.g., Hu et
al. 2008; Sulentic et al. 2000; Brotherton et al. 1996; Mason et al. 1996).
This model indicates that the broad line can be described with superposition of
two Gaussian components (Very Broad Gaussian Component (VBGC) and InterMediate
Gaussian Component (IMGC)) which are from two physically distinct regions;
i.e., Very Broad Line Region (VBLR) and InterMediate Line Region (IMLR). We
select a SDSS sample to further confirm this model and give detailed analysis
to the geometry, density and evolution of these two regions. Micro-lensing
result of BLR in J1131-1231 and some unexplained phenomena in Reverberation
Mapping (RM) experiment provide supportive evidence for this model. Our results
indicate that the radius obtained from the emission line RM normally
corresponds to the radius of the VBLR, and the existence of the IMGC may affect
the measurement of the black hole masses in AGNs. The deviation of NLS1s from
the M-sigma relation and the Type II AGN fraction as a function of luminosity
can be explained in this model in a coherent way. The evolution of the two
emission regions may be related to the evolutionary stages of the broad line
regions of AGNs from NLS1s to BLS1s. Based on the results presented here, a
unified picture of hierarchical evolution of black hole, dust torus and galaxy
is proposed.

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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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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: cmp-lg