Lenses, Mirrors, and HST: IRAS FSC10214+4724 Under a Compound Microscope

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Hst Proposal Id #6834 Cosmology

Scientific paper

Our existing WFPC2 F814W image provides compelling evidence that the luminous IRAS source FSC 10214+4724 at redshift 2.3 is gravitationally lensed. The source is also highly polarized {26% in the blue}, and Keck data recently obtained by one of us shows broad emission lines in polarized light, while the narrow lines are unpolarized. We propose to obtain polarimetric imaging of the blue continuum of this source with the FOC, and imaging of the unpolarized narrow CIV line with the linear ramp filter in WFPC2. We will use our gravitational lens model to interpret these images, allowing us to measure the relative locations and sizes of the scattering region and the narrow emission line region on scales as small as 50 pc.

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