Evidence for Obscured broad Components in Type-2 AGN
Abstract
In the manuscript, we report evidence on broad components apparently obscured in Type-2 AGN under the framework of the Unified model, after checking properties of broad 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 components in Type-2 AGN than in Type-1 AGN, which can be naturally explained by stronger obscured broad 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 components coming from emission regions nearer to central BHs, and also indicate the core component as the better indicator for central activities in Type-2 AGN, due to few effects of obscuration on the core component. Considering the broad 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 component can be applied to explain the different flux ratios of between Type-1 and Type-2 AGN in the BPT diagram.
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