Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-04
Astron.Astrophys. 424 (2004) 531-543
Astronomy and Astrophysics
Astrophysics
16 pages, 7 figures, 3 tables, accepted by Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20035772
We present the complete set of ISOPHOT observations of 3CR radio galaxies and quasars, which are contained in the ISO Data Archive, providing 75 mid- and far-infrared spectral energy distributions (SEDs) between 5 and 200 micron. For 28 sources they are supplemented with MAMBO 1.2 mm observations and for 15 sources with new submillimetre data from the SCUBA archive. We check the orientation-dependent unified scheme, in which the powerful FR2 narrow line galaxies are quasars viewed at high inclination, so that their nuclei are hidden behind a dust torus intercepting the optical-ultraviolet AGN radiation and reemitting it in the infrared. We find that (1) both the quasars and the galaxies show a high mid- to far-infrared luminosity ratio typical for powerful AGNs and (2) -- when matched in 178 MHz luminosity -- both show the same ratio of isotropic far-infrared to isotropic 178 MHz lobe power. Therefore, from our large sample investigated here we find strong evidence for the orientation-dependent unification of the powerful FR2 galaxies with the quasars.
Bemmel Ilse van
Bertoldi Frank
Chini Rolf
Egner Sebastian
Freudling Wolfman
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