Mathematics – Logic
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3724w&link_type=abstract
HST Proposal ID #3724
Mathematics
Logic
Hst Proposal Id #3724
Scientific paper
We propose to investigate a model of Seyfert 2 galaxies in which a dusty, obscuring torus of material hides a Seyfert 1 nucleus. This model is supported by: 1) morphological evidence, which comprises bi-conical regions of high excitation gas symmetrically disposed about the nucleus and with axis coincident with the radio axis; 2) energetic considerations, from which the emission-line gas along the cone's axis is found to be illuminated by much more intense ionizing radiation than is inferred by extrapolation of the directly observed IUE/soft X-ray continua; and 3) spectropolarimetric observations, which reveal a Seyfert 1-like broad line spectrum when the Seyfert 2 is viewed in linearly polarized light. We shall obtain emission-line and continuum images of eight bright Seyferts, selected to have very strong emission lines, extended high excitation gas in ground-based observations, and "linear" (double, triple or jet-like) radio sources on the arc sec scale. These images will be used to a) determine the incidence and properties of "ionizing cones", b) investigate the detailed relationship between the jet-like radio sources and the ionized gas, c) search for direct evidence of dusty tori through reddening effects on the continuum images, and d) investigate the ionization balance of the emission-line knots, as a probe of anisotropic nuclear ionizing radiation.
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