IRS 19-38 micron spectra of 3CRR radio galaxies and quasars at z>1: Testing AGN unification at the peak of cosmic activity

Details IRS 19-38 micron spectra of 3CRR radio galaxies and quasars at z>1: Testing AGN unification at the peak of cosmic activity IRS 19-38 micron spectra of 3CRR radio galaxies and quasars at z>1: Testing AGN unification at the peak of cosmic activity

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40314h&link_type=abstract

Spitzer Proposal ID #40314

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Scientific paper

Pure orientation-dependent AGN unification predicts for unobscured isotropic observables that powerful FRII radio galaxies and steep-spectrum quasars show the same distribution of high-excitation lines to radio power and of high- to low- excitation lines. By means of IRS spectra we were able to provide a successful test of this prediction for radio sources at intermediate redshift up to z<1. But at high redshift z>1 submillimetre observations of quasars and radio galaxies found intriguing differences between the two AGN classes. The differences could be due to the higher intrinsic luminosity at z>1, to co-eval starbursts or to other evolutionary effects which are related to the higher activity at the earlier cosmic epoch. In order to test AGN unification at high redshift and luminosity, we propose to obtain IRS low-resolution spectra of a complete 3CRR sample at 11 detailed 3.6-24 micron SEDs will be observed in 6 Spitzer bands using GTO. Then in a first step the spectroscopic results from the proposed 18 sources can be compared with broad-band SED features constraining models of the nuclear regions, and in a second step we may expand conclusions to the entire larger sample.

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