Ruhr Universität, Bochum, Germany
Infrared spectral energy distributions between 4.8 and 200 
m are presented
for a subsample of ten quasars and radio galaxies from the European Central
Quasar Programme observed with ISO. For three of the sources this represents
the
first far infrared detection. The SEDs reveal signatures of thermal dust as
well
as synchroton emission. In most cases one of the two components is so dominant
that the other remains hidden. The SEDs of the radio quiet and steep spectrum
quasars show a bump around 60m and a decline longward of 100m, strong
evidence for thermal emission. It can be described as a superposition of
several
modified blackbodies, showing the broad variety of temperatures from hot (about
600K) to cool (about 30K) dust present in these objects. The infrared emission
of the flat spectrum radio quasars is in smooth continuation of the radio
spectrum supporting the interpretation as synchroton emission. For one of these
sources (3C279) a bump is prying above the synchroton spectrum and we
interprete
it as thermal emission. For comparison within the framework of unified schemes
the radio galaxies Cyg A (3C405) and 3C20 are observed. While 3C20 has not been
detected, Cyg A reveals an infrared spectrum surprisingly similar to that of
3C48 and the radio quiet quasars, strongly supporting the interpretation of the
radio galaxy Cyg A as a hidden quasar.