Volume 445, Number 1, January I 2006
|Page(s)||115 - 122|
|Published online||13 December 2005|
MAMBO 1.25 mm observations of 3CR quasars at z ~ 1.5: on the debate of the unified schemes
Astronomisches Institut, Ruhr-Universität Bochum (AIRUB), Universitätsstr. 150 / NA7, 44780 Bochum, Germany e-mail: firstname.lastname@example.org
2 Radioastronomisches Institut, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
3 Instituto de Astronomía, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile
Accepted: 2 September 2005
In order to explore the nature of the 850 μm flux difference between powerful radio galaxies and steep radio-spectrum quasars at reported by Willott et al. (2002), we have observed 9 sources from their sample of 11 quasars at 1.25 mm. For 7 sources the 1.25 mm fluxes are much brighter than one would expect from a purely thermal dust model fitted to the submm data, providing evidence for the synchrotron nature of the observed 1.25 mm radiation. If we extrapolate a power-law synchrotron spectrum to shorter wavelengths, then for 6 of the 9 sources also the 850 μm fluxes are dominated by synchrotron radiation. We discuss how far the (sub)-millimetre data can be interpreted in accordance with the orientation-dependent unified schemes for powerful radio galaxies and quasars. In this case the results challenge the reported evidence for the receding torus model and for the evolutionary trend of a declining dust luminosity with increasing projected size of the radio lobes.
Key words: galaxies: fundamental parameters / galaxies: photometry / galaxies: quasars: general / infrared: galaxies
© ESO, 2005
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