Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3837k&link_type=abstract
HST Proposal ID #3837
Other
Hst Proposal Id #3837
Scientific paper
Models of accretion disks have invoked scattering atmospheres to explain the dearth of detected Lyman edges in quasars, which are otherwise predicted by the thin accretion disk. Scattering could possibly broaden any Lyman edge feature beyond recognition. Unfortunately, alleviating one problem generates another problem: Scattering of UV emission results in strong polarization and the polarization vector is perpendicular to the radio jets. According to Laor, Netzer and Piran, the polarization is quenched below 912 A. We propose to use the FOS to determine the amount of polarization from below the Lyman limit to Lyman ALPHA in 3 low red-shift (0.5 - 1.6) quasars with moderate resolution and signal-to-noise ratio of >90. The targets are the objects whose IUE spectra show broad, partial edges at the systemic redshifts, and no corresponding absoprtion lines: these are the expected properties for simple thin disks. These observations will be used to test the predictions of the thin accretion disk models. The results will provide critical constraints and help in the development of the accretion disk models.
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