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Date and Time of the Query: 2018-12-19 T08:23:57 PST
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For refcode 2006A&A...445..115H:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2006A&A...445..115H MAMBO 1.25 mm observations of 3CR quasars at z ~ 1.5: on the debate of the unified schemes M. Haas, R. Chini, S. A. H. Muller, F. Bertoldi and M. Albrecht Received 16 December 2004 / Accepted 2 September 2005 In order to explore the nature of the 850 microns flux difference between powerful radio galaxies and steep radio-spectrum quasars at z~ 1.5 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 microns 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
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