Spitzer Observations of Powerful Radio Sources

Details Spitzer Observations of Powerful Radio Sources Spitzer Observations of Powerful Radio Sources

2007-07-26

arxiv.org/abs/0707.4002v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear in "The Central Engine of Active Galactic Nuclei", ed. L.C. Ho and J.-M. Wang, ASP Conference Se

Scientific paper

We have measured the mid-infrared radiation from an orientation-unbiased sample of powerful 3C RR galaxies and quasars using the IRS and MIPS instruments aboard the Spitzer Space Telescope. We fit the Spitzer data as well as other measurements from the literature with synchrotron and dust components. At 15 microns, quasars are typically four times brighter than radio galaxies with the same isotropic radio power. Based on our fits, half of this difference can be attributed to the presence of non-thermal emission in the quasars but not the radio galaxies. The other half is consistent with dust absorption in the radio galaxies but not the quasars.

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