Mathematics – Metric Geometry
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4351w&link_type=abstract
HST Proposal ID #4351
Mathematics
Metric Geometry
Hst Proposal Id #4351
Scientific paper
Our ground-based spectrophotopolarimetry shows that nearly half of a small sample of the most luminous IRAS AGN (L > 10^11 L(suns)) are highly polarized (up to p% = 25%) and the polarization is strongly wavelength dependent. For several we observe a typical QSO spectrum in polarized light suggesting the axisymmetric geometry proposed for lower luminosity AGN like NGC 1068. We propose to use spectropolarimetry with the FOS to investigate the nature of the polarization in this UNIQUE sample of highly polarized IRAS-selected IR-ultraluminous AGN, and thereby constrain the nuclear geometry and investigate the `hidden QSO' hypothes is. HST will provide the wide wavelength coverage needed to discriminate among different polarization mechanisms, and extend our ground-based spectropolarimetry to ~1650 A. Imaging will help constrain the geometry of the scatterers, which is important for detailed investigation of their properties. Better understanding of selection biases caused by dust will be important in understanding the space density and evolution of AGN.
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