DUST AT HIGH-Z

We have searched for dust emission at 1300 mum in three distant radio galaxies and detected faint signals from 4C41.17 (z = 3.8) and 0902+34 (z = 3.46); for 1232+39 (z = 3.22) we could obtain a useful upper lim it. Comparison with radio and submm data suggests that the 1300 mum fl ux from the most distant known galaxy 4C41.17 is due to thermal emissi on from dust. We derive a dust temperature of approximately 80K. Adopt ing galactic grain properties, this transforms into a total dust mass M(dust) approximately 9 . 10(7) M. for 4C41.17 and comparable values f or the two other distant objects. The ionized gas of the Lyalpha halo and the dust must be spatially separated; we suggest a disk-like confi guration for the dust, perpendicular to the alignment axis of radio an d optical emission. The IR luminosity of 4C41.17 is estimated to be ap proximately 10(14) L..