Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Seyfert 2 Galaxies with Spectropolarimetric Observations   We present a compilation of radio, infrared, optical and hard X-ray (2-10kev)
data for a sample of 90 Seyfert 2 galaxies(Sy2s) with spectropolarimetric
observations (41 Sy2s with detection of polarized broad lines (PBL) and 49
without PBL). Compared to Sy2s without PBL, Sy2s with PBL tend to be
earlier-type spirals, and show warmer mid-infrared color and significant excess
of emissions (including the hard X-ray(2-10kev), [O {\sc iii}]$\lambda$5007,
infrared (25 $\mu$m) and radio). Our analyses indicate that the majority of
Sy2s without PBL are those sources having less powerful AGN activities, most
likely caused by low accretion rate. It implies that the detectability of the
polarized broad emission lines in Sy2s may depend on their central AGN
activities in most cases. Based on the available data, we find no compelling
evidence for the presence of two types of Sy2s, one type of them has been
proposed to be intrinsically different from Sy2s claimed in Unification Model.

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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph