Mathematics – Metric Geometry
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5928h&link_type=abstract
HST Proposal ID #5928
Mathematics
Metric Geometry
Hst Proposal Id #5928 Agn
Scientific paper
Our ground-based optical spectropolarimetry shows that nearly half of our sample of ``warm'' IR-Ultraluminous AGNs (L_IR >= 10^11.5 Lsun) exhibit high and wavelength dependent polarization (up to p = 25%). In several we observe typical QSO broad emission line spectra in polarized light suggesting an inner structure similar to the axisymmetric geometry proposed for lower luminosity AGNs such as NGC 1068. Our ground based spectropolarimetry also suggests a strong connection between the IR-Ultraluminous AGNs and the rare Broad Absorption Line (BAL) QSOs; the BALQSOs and the IR-Ultraluminous AGNs would appear as normal UV-excess QSOs if viewed along a different line of sight. UV-spectropolarimetry, which can only be accomplished with the HST FOS, combined with our ground-based optical spectropolarimetry will allow us to distinguish between electron scattering, dust scattering and dichroic absorption. In addition, the wide wavelength coverage will allow us to compare the polarization properties of the continuum, and emission-line and absorption-line features of different ionizations, and thus constraining the geometries of these regions.
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