Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-05
Astronomy and Astrophysics
Astrophysics
8 pages, 4 Figures, accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20054121
In order to explore the nature of the 850 micron 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 micron 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.
Albrecht Marcus
Bertoldi Frank
Chini Rolf
Haas Martin
Mueller Sven
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