Unification of 3CR Radio Galaxies and Quasars

Details Unification of 3CR Radio Galaxies and Quasars Unification of 3CR Radio Galaxies and Quasars

2006-12-21

arxiv.org/abs/astro-ph/0612670v1

Astronomy and Astrophysics

Astrophysics

2 pages, Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San

Scientific paper

We have observed seven powerful FR2 radiogalaxies and seven quasars with the Spitzer IRS. Both samples are comparable in both, redshift range and isotropic 178 Hz luminosity. Both samples are found to have similar distributions in the luminosity ratios of Mid-IR high- and low-excitation lines ([NeV]/[NeII]), and of Mid-IR high-excitation line to radio power ratio ([NeV]/P_178MHz). However, the MIR/FIR ratio is generally higher for quasars. We further observed Silicate features at 10 and 18micron in emission. In our sample only quasars show emission features, while silicate absorption is seen only in the radio galaxies. These observations are all in agreement with unification schemes that explain both groups as the same class of objects seen under different orientation angles.

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