Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6815t&link_type=abstract
HST Proposal ID #6815
Computer Science
Hst Proposal Id #6815 Qso Absorption Lines
Scientific paper
We propose a strategy to obtain WFPC2 polarimetry that will allow us to explore the polarization mechanism operating in the gravitationally lensed ``Cloverleaf'' broad absorption line {BAL} QSO H1413+1143. This is one of a number of BAL QSOs known to exhibit optical polarization, however the nature of the polarization is not understood in this class of object. This BAL QSO manifests itself as 4 lensed components, however the weakness of the broad emission lines in component D relative to components A, B, C, indicate that the size-scale of the amplified regions are substantially smaller for component D {microlensing} in comparison to components A, B, C. This fact should allow us to constrain the size-scale of the polarized light in the Cloverleaf. The net polarization of the Cloverleaf is 4.5% and the brightnesses of the components are not too different. If the polarization originates close in to the central source, all four components should be polarized equally. However, if the polarization originates in a large scattering region, component D should have near zero polarization while the remain components should have 6% polarization. While the polarizations are small, we can take advantage of the fact that we are looking for differences in polarizations between the 4 components, not an absolute polarization for any single component. We believe that the observing strategy we have developed for WFPC2 will allow us to measure differences in polarization on the order of 1%. However, even if we achieve an accuracy of 2-3%, we should be able to test the extreme model we propose.
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