The structure and composition of high redshift radio galaxies
R A E Fosbury, J Vernet, M Villar-Martin, M H Cohen, A Cimatti, S di Serego Alighieri, P J McCarthy
Abstract
Keck spectropolarimetry, giving spectral coverage from Ly-α to beyond CIII], and HST imaging of a sample of powerful radio galaxies with z2.5\ has been obtained. These data are giving us a clear picture of the nature of the `alignment effect' and are revealing new correlations between polarization and emission line ratios which may be interpreted in the context of the stellar evolutionary histories of these massive galaxies. In particular, we see the 2200Ådust absorption feature in the radio galaxy continua and a large variation in the NV/CIV line ratio amongst objects having a similar ionization level. VLT infrared spectroscopy of this and similar samples will give us a view of a period of galaxy history during which rapid chemical evolution was taking place.
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