Jet and Torus Orientations in High Redshift Radio Galaxies
  We examine the relative orientation of radio jets and dusty tori surrounding
the AGN in powerful radio galaxies at z > 1. The radio core dominance R = P(20
GHz) /P(500 MHz) serves as an orientation indicator, measuring the ratio
between the anisotropic Doppler-beamed core extended core emission and the
isotropic lobe emission. Assuming a fixed cylindrical geometry for the hot,
dusty torus, we derive its inclination i by fitting optically-thick radiative
transfer models to spectral energy distributions obtained with the Spitzer
Space Telescope. We find a highly significant anti-correlation (p < 0.0001)
between R and i in our sample of 35 type 2 AGN combined with a sample of 18 z =
1 3CR sources containing both type 1 and 2 AGN. This analysis provides
observational evidence both for the Unified scheme of AGN and for the common
assumption that radio jets are in general perpendicular to the plane of the
torus. The use of inclinations derived from mid-infrared photometry breaks
several degeneracies which have been problematic in earlier analyses. We
illustrate this by deriving the core Lorentz factor Gamma from the R-i
anti-correlation, finding Gamma > 1.3.
