Geometry and Generalizability of the Reflected Light Model for Seyfert 2 Galaxies -CYC3 Supplemental

Details Geometry and Generalizability of the Reflected Light Model for Seyfert 2 Galaxies -CYC3 Supplemental Geometry and Generalizability of the Reflected Light Model for Seyfert 2 Galaxies -CYC3 Supplemental

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4500c&link_type=abstract

HST Proposal ID #4500

Other

Hst Proposal Id #4500

Scientific paper

The polarized flux spectra of at least 8 Seyfert 2 galaxies look like the flux spectra of Seyfert 1 nuclei, and the polarization position angles are generally perpendicular to the radio structure axes. This and other evidence suggests that all Seyfert 2 galaxies may have Seyfert 1 spectra visible only in reflected light. The broad-line regions can be viewed directly in the cases where the otherwise obscuring tori are viewed pole on, and such objects would be classified as Seyfert 1 galaxies. It is crucial to determine whether this generalization of the polarization results is correct, and in particular whether all Seyfert 2 galaxies have polarized nuclear continuua with position angles perpendicular to the radio source axes. We argue that contamination by host-galaxy starlight usually renders this virtually impossible to determine from the ground, while from space, the observations would be easy and straightforward. We can use the FOS on the HST as a polarimeter, cutting down drastically on the starlight by observing in the UV where the stellar flux is weak. We can also determine the geometry of the obscuring regions, and for many of the objects, we can determine whether the mechanism of the polarization is dust or electron scattering. We can determine continuum slopes and identify broad Fe II features from the flux spectra we receive as a by-product of the polarimetry.

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