Unification of 3CR Radio Galaxies and Quasars
Abstract
With the Spitzer IRS (Houck et al. 2004) 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.
Additional Information
© 2008 Astronomical Society of the Pacific. This work is based on observations with the Spitzer Space Telescope, and has made use of the NASA/IPAC Extragalactic Database (NED), both operated by JPL/Caltech, under contract with NASA.Attached Files
Published - Schulz2008p8641Second_Annual_Spitzer_Science_Center_Conference_Infrared_Diagnostics_Of_Galaxy_Evolution.pdf
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Additional details
- Eprint ID
- 19162
- Resolver ID
- CaltechAUTHORS:20100722-102939396
- Created
-
2010-08-02Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)
- Series Name
- ASP Conference Series