3.8 QSOsin a deep CCD survey
Ian Smail, Alastair C. Edge, Richard S. Ellis, PASA, 15 (3), 267
The html and gzipped postscript versions of this paper are in preprint form.
To access the final published version, download the pdf file.
| Next Section: Acknowledgements Title/Abstract Page: The identification of two Previous Section: Analysis and Discussion | Contents Page: Volume 15, Number 3 |
Conclusions
We have identified two candidate 
QSOs on the basis of their UV and optical colours and stellar morphology from a multi-colour CCD survey covering 0.25 sq. degrees to I=21.
Spectroscopic observations of the two candidates confirms that they are QSOs: Q1332+5034 at z=3.815 and Q1722+3211 at z=3.727. Q1332+5034 is coincident with a faint X-ray source.
Our spectra also show two strong absorption systems along the line of sight to the Q1332+5034. The more distant of these is a damped Lyman-
system at z=3.439 which also produces a Lyman-limit in the QSO spectrum.
The second, lower, redshift absorption system in Q1332+5034 at 
has an observed equivalent width of 
Å, and thus arises either from an extremely high column-density damped Lyman- absorber or from a blend of several strong absorbers. We favour the second interpretation and thus suggest that this feature may represent an over-dense region in the Lyman- forest with a comoving size of 
Mpc. Such structures appear to be rare and we conclude that the Q1332+5034 is worthy of more detailed scrutiny.
| Next Section: Acknowledgements Title/Abstract Page: The identification of two Previous Section: Analysis and Discussion | Contents Page: Volume 15, Number 3 |
© Copyright Astronomical Society of Australia 1997