Evidence for Obscured broad \oiii Components in Type-2 AGN
  In the manuscript, we report evidence on broad \oiii components apparently
obscured in Type-2 AGN under the framework of the Unified model, after checking
properties of broad \oiii emissions in large samples of Type-1 and Type-2 AGN
in SDSS DR12. We can well confirm the statistically lower flux ratios of the
broad to the core \oiii components in Type-2 AGN than in Type-1 AGN, which can
be naturally explained by stronger obscured broad \oiii components by central
dust torus in Type-2 AGN, unless the Unified model for AGN was not appropriate
to the narrow emission lines. The results provide further evidence to support
broad \oiii components coming from emission regions nearer to central BHs, and
also indicate the core \oiii component as the better indicator for central
activities in Type-2 AGN, due to few effects of obscuration on the core \oiii
component. Considering the broad \oiii components as signs of central outflows,
the results provide evidence for strong central outflows being preferentially
obscured in Type-2 AGN. Furthermore, the obscured broad \oiii component can be
applied to explain the different flux ratios of \oiiihb between Type-1 and
Type-2 AGN in the BPT diagram.
