Summary

• HDF starbursts emit at 850-mm

  • statistical detections down to 0.1 mJy
  • mean hidden : visible SFR is 4.5 : 1

• The 850-mm background is clustered

  • consistent with shot noise
  • limits background clustering to q0 < 2 arcsec
  • consistent with very broad redshift range contributing to background

• Future issues

  • what is the upper redshift limit?
  • nature of HDF 850.1?
  • comparison with NICMOS

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