The Origin of the Alignment Effect: Imaging polarimetry of two z~1 radio galaxies

Physics

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Hst Proposal Id #5940 Agn

Scientific paper

We propose to employ the unique imaging capabilities of HST to obtain high spatial resolution WFPC2 polarization images of the high redshift radio galaxy 3C324. These polarimetric observations are crucial to the understanding of the spectacular morphologies recently discovered in high redshift radio galaxies by HST. The galaxy selected for our study is known to have highly polarized restframe UV continuum emission from ground-based observations. Cycle 4 HST PC observations of 3C324 {z=1.206} have discovered underlinenumerous high surface brightness clumps on underline 0"per1 {sub-kpc distributed in a roughly linear structure along the radio source major axis. The goal of this proposal is to study the distribution of the polarized light and infer the physical properties and detailed spatial structure of the scattering medium in this galaxy. These observations will provide a strong test of the radio galaxy - quasar AGN unification model and the scattering hypothesis for the alignment effect seen in high redshift radio galaxies.

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