Submillimetre Observations of z>6 Quasars
  We report on submillimetre observations of three high redshift (z>6) quasars, made using the SCUBA camera on the JCMT. Only one of the sample was detected at 850um-- SDSS J1148+5251 (z=6.43). It was also detected (>3 sigma significance) at 450um, one of the few z>4 quasars for which this is the case. In combination with existing millimetric data, the submm detections allow us to place limits on the temperature of the submm-emitting dust, hence on the mass of dust to be synthesized under the time constraint imposed by the quasar's redshift. 
Ian Robson (1), Robert Priddey (2 and 3), Kate Isaak (4), Richard   McMahon (5) ((1) UK ATC, Edinburgh, (2) Imperial College...