Spectropolarimetry of Low Red-Shift Quasars - Test of the Emission Mechanism

Details Spectropolarimetry of Low Red-Shift Quasars - Test of the Emission Mechanism Spectropolarimetry of Low Red-Shift Quasars - Test of the Emission Mechanism

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6109k&link_type=abstract

HST Proposal ID #6109

Physics

Hst Proposal Id #6109 Quasars

Scientific paper

The Lyman limit region may be the most important part of the quasar spectrum. Models of accretion disks make predictions about the polarization and the discontinuity at the Lyman limit. Scattering of UV emission in the disk atmospheres results in strong polarization and the polarization vector should be perpendicular to the radio jets. According to Laor, Netzer and Piran, the disk radiation is significantly polarized for Lambda > 912 Angstrom and polarization is quenched for Lambda <912 Angstrom, even if the Lyman edges are weak or absent in the total flux. We have a list of candidates whose IUE spectra seem to show signatures of simple thin disks, i.e. broad partial Lyman absorption edges at the systemic redshifts. Previous observations of 3 quasars from this list show the opposite behaviour. The polarization magnitude is upto 20 percent below the edge. Therefore, we propose to use the FOS to observe 2 low red-shift ~1.5 quasars from below the Lyman limit to LyAlpha with moderate resolution and signal-to-noise ratio of ~90 to determine the amount of polarization. These observations will be used to investigate the nature of the Lyman edges and any associated Lyman absorption lines. The results will provide critical constraints and help in the development of thermal models.

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