An Unusual Type of AGN: A Challenge to the Unification Model

Details An Unusual Type of AGN: A Challenge to the Unification Model An Unusual Type of AGN: A Challenge to the Unification Model

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40385r&link_type=abstract

Spitzer Proposal ID #40385

Physics

Scientific paper

We propose to obtain the IR spectral energy distributions (SEDs) of a small sample of unusual AGN--optically type 1.8/2 objects with little X-ray obscuration. Their extreme properties relative to the current unification model of AGN are our best means to refine the model and may identify exceptions that would strongly modify our overall view of the subject. There are various possibilities for the origin of this type of AGN: (1) they do not harbor broad line regions, which also implies that the torus does not exist or does not obscure our direct view of the nucleus if it is present; (2) dust survives in the broad line regions of these objects to obscure the broad line regions but not the X-rays; (3) the torus is very clumpy, permitting X-rays to pass but blocking the broad line regions. Spitzer data will test the above possibilities and provide information to improve the standard unification model.

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