SPITZER REVEALS HIDDEN QUASAR NUCLEI IN SOME POWERFUL FR II RADIO GALAXIES
@article{Ogle2006SPITZERRH, title={SPITZER REVEALS HIDDEN QUASAR NUCLEI IN SOME POWERFUL FR II RADIO GALAXIES}, author={Patrick Ogle and David Harold. Whysong and Richard L. White . Sirtf Science Center and Caltech and U. C. Santa Barbara and Nrao}, journal={The Astrophysical Journal}, year={2006}, volume={647}, pages={161-171} }
We present a Spitzer mid-infrared survey of 42 Fanaroff-Riley class II radio galaxies and quasars from the 3CRR catalog at redshift z 8 × 10 to the 43rd ergs s^-1, indicating strong thermal emission from hot dust in the active galactic nucleus. Our results demonstrate the power of Spitzer to unveil dust-obscured quasars. The ratio of "mid-IR luminous" narrow-line radio galaxies to quasars indicates a mean dust covering fraction of 0.56 ± 0.15, assuming relatively isotropic emission. We analyze…
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References
SHOWING 1-10 OF 65 REFERENCES
Dust emission from 3C radio galaxies and quasars: New ISO observations favour the unified scheme
- Physics
- 2001
In order to test the unied scheme for luminous radio galaxies and quasars we observed 10 galaxy/quasar pairs from the 3CR catalogue with ISOPHOT at infrared wavelengths between 5 and 180 m. Each pair…
Far-Infrared Observations of Radio Quasars and FR II Radio Galaxies
- Physics
- 2005
We report MIPS photometry of 20 radio-loud quasars and galaxies at 24 and 70 μm (and of five at 160 μm). We combine this sample with additional sources detected in the far-infrared by IRAS and ISO…
ISOCAM survey and dust models of 3CR radio galaxies and quasars
- Physics
- 2004
We present a survey of all 3CR sources imaged with ISOCAM onboard the Infrared Space Observatory (ISO) . The sample consists mostly of radio-loud active galactic nuclei (AGN). For each source, we…
The Optically Powerful Quasar E1821+643 is Associated with a 300 Kiloparsec-Scale FR I Radio Structure
- Physics
- 2001
We present a deep image of the optically powerful quasar E1821+643 at 18 cm made with the Very Large Array. This image reveals radio emission, over 280 h-1 kpc in extent, elongated way beyond the…
THERMAL EMISSION AS A TEST FOR HIDDEN NUCLEI IN NEARBY RADIO GALAXIES
- Physics
- 2004
The clear sign of a hidden quasar inside a radio galaxy is the appearance of quasar spectral features in its polarized (scattered) light. However, that observational test requires suitably placed…
What Powers Ultra-luminous IRAS Galaxies?
- Physics
- 1997
We present an ISO SWS and ISOPHOT-S, mid-infrared spectroscopic survey of 15 ultra-luminous IRAS galaxies. We combine the survey results with a detailed case study, based on near-IR and mm imaging…
Scattered Radiation from Obscured Quasars in Distant Radio Galaxies
- Physics
- 1998
We present optical spectropolarimetric and imaging polarimetric observations of four high-redshift radio galaxies (HzRGs) obtained with the Low Resolution Imaging Spectrometer of the 10 m Keck I…
1–5 μm imaging of 3CRR galaxies: the K–z relation and the geometry of the torus
- Physics
- 2000
It has been claimed by Taylor et al. that the low-redshift end of the K–z relation for radio galaxies is too bright by about half a magnitude owing to contributions from the obscured quasar nuclei.…
No evidence for a different accretion mode for all 3CR FR I radio galaxies
- Physics
- 2003
We have analysed the optical and radio properties of a sample of 3CR FR I radio galaxies which have Hubble Space Telescope (HST) imaging capable of detecting optical cores. The jet powers of the FR I…
Polarimetry and Unification of Low-Redshift Radio Galaxies
- Physics
- 1999
We have made high-quality measurements of the polarization spectra of 13 FR II radio galaxies and taken polarization images for 11 of these with the Keck telescopes. Seven of the eight narrow-line…