Multiwavelength observations of the eld HS 47.5/22 in

We present the X{ray source catalogue ob- tained from a ROSAT survey in the HQS eld HS 47.5/22. The survey consists of 48 overlapping PSPC pointings which were rst analysed individually, and then merged to increase the sensitivity. Both modes bring forth sources missed in the other, showing that both are necessary to detect all X{ray sources in the eld. The nal catalogue contains 574 X{ray sources. The identications are mainly based on the HQS objective prism plate which allows ob- ject classication down to a magnitude mb < 18: m 5, and a rough distinction between red and blue objects more than a magnitude deeper. Follow{up observations were performed for a number of objects, mainly faint quasar candidates.