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The ISOPHOT-MAMBO survey of 3CR radio sources: Further evidence for the unified schemes

M. Haas·S. A. H. Mueller·F. Bertoldi·R. Chini·S. Egner·W. Freudling·U. Klaas·O. Krause·D. Lemke·K. Meisenheimer·R. Siebenmorgen·I. van Bemmel
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Abstract

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.

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M. Haas, S. A. H. Mueller, F. Bertoldi, R. Chini, S. Egner, W. Freudling, U. Klaas, O. Krause, D. Lemke, K. Meisenheimer, R. Siebenmorgen, I. van Bemmel. 2004-06-04. The ISOPHOT-MAMBO survey of 3CR radio sources: Further evidence for the unified schemes. https://doi.org/10.1051/0004-6361%3A20035772

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