Mathematics – Logic
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6583d&link_type=abstract
HST Proposal ID #6583
Mathematics
Logic
Hst Proposal Id #6583 Agn
Scientific paper
Cycle 4 imaging of z 1 radio galaxies has demonstrated that their restframe UV morphologies, which are aligned with the radio axes, are comprised of compact, high surface brightness kpc-scale knots. We propose to employ the unique imaging capabilities of HST to obtain high spatial resolution { 0"per1} WFPC2 polarization images of three of the brightest, aligned high redshift {z 1} radio galaxies, 3C265, 3C356 and 3C441. These polarimetric observations are crucial to the understanding of the spectacular morphologies recently discovered in high redshift radio galaxies by HST, and to the investigation of morphological and evolutionary links between radio galaxies and quasars. The objects selected for our study are all known to have highly polarized restframe UV continuum emission based on Keck observations. In addition, Keck spectroscopy of 3C265 {z=0.811} has shown the first evidence of broad, off-nuclear MgII line emission which strongly suggests scattering of radiation from a hidden or `mis-directed' quasar nucleus. The goal of this proposal is to study the kpc-scale spatial distribution of the polarized light and infer the physical properties of the nucleus and detailed spatial structure of the scattering medium in these galaxies. These high spatial resolution observations of prototypical aligned radio galaxies will also provide stringent tests 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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