Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-02-09
Astronomy and Astrophysics
Astrophysics
4 pages including 1 figure, to be published in the proceedings of ESA conference 'The Universe as seen by ISO', ed. M. Kessler
Scientific paper
In order to test the unification scheme for double-lobed radio sources, the far-infrared properties of matched samples of radio-galaxies and radio-loud quasars were studied using ISOPHOT. The quasar data were complemented with nearly simultaneous submillimeter and centimeter radio data. The results show that quasars are generally brighter than radio-galaxies in their far-infrared output and that beamed non-thermal radiation must be excluded as source for this infrared excess. However, non-thermal flares or optically thick tori can still reconcile these results with the unification scheme.
Barthel Peter D.
de Graauw Thijs
van Bemmel Ilse M.
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