QSOs and Absorption-Line Systems surrounding the Hubble Deep Field

@article{Berk2000QSOsAA,
  title={QSOs and Absorption-Line Systems surrounding the Hubble Deep Field},
  author={Daniel E. vanden Berk and Chris Stoughton and Arlin P. S. Crotts and David Tytler and David Kirkman Fermilab and M. Scodeggio D. Silva European Southern Observatory and Columbia University and UC San Diego},
  journal={The Astronomical Journal},
  year={2000},
  volume={119},
  pages={2571-2582}
}
We have imaged a 45' × 45' area centered on the Hubble Deep Field (HDF) in UBVRI passbands, down to the limiting magnitudes of approximately 21.5, 22.5, 22.2, 22.2, and 21.2, respectively. The principal goals of the survey are to identify quasi-stellar objects (QSOs) and to map structure traced by luminous galaxies and QSO absorption line systems in a wide volume containing the HDF. The area surveyed is 400 times as large as that of the HDF, and 40 times as large as that of the HDF Flanking… 
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