Radiatively Inefficient Radio Galaxies

Details Radiatively Inefficient Radio Galaxies Radiatively Inefficient Radio Galaxies

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.7103o&link_type=abstract

American Astronomical Society Meeting 208, #71.03; Bulletin of the American Astronomical Society, Vol. 38, p.149

Astronomy and Astrophysics

Astronomy

Scientific paper

We observed a large sample of powerful radio galaxies at redshift z<1 with the Spitzer Space Telescope. We find that roughly 50% contain a hidden quasar nucleus that is a powerful source of mid-IR emission. The mid-IR continuum comes from 200-700 K silicate dust in an obscuring torus. High-ionization mid-IR forbidden lines such as [Ne V] confirm the presence of a hidden quasar. The nuclear dust covering fraction of the mid-IR luminous radio galaxies is inferred to be 60%. However, 50% of the radio galaxies in our sample belong to a separate population of mid-IR weak sources. Many of these have low-ionization nuclear emission spectra. Our results are contrary to standard radio galaxy and quasar unification. The radio jets in mid-IR weak galaxies may be powered by radiatively inefficient accretion flows or black hole spin.This research is based on observations with the Spitzer Space Telescope, operated by the Jet Propulsion Laboratory, Caltech, under NASA contract.

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