Unification of 3CR Radio Galaxies and Quasars

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

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..450s&link_type=abstract

The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,

Astronomy and Astrophysics

Astronomy

Scientific paper

With the Spitzer IRS tep{houck2004} we have observed seven powerful FR2 radiogalaxies and seven quasars. Both samples are comparable in both, isotropic 178 Hz luminosity and redshift range. We find for both samples 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_{178 MHz}). We further observed Silicate features at 10 and 18 μm in emission. Emission features are limited to the quasar group, 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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