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Published March 2001 | Published + Accepted Version
Journal Article Open

Lost and Found: The Damped Lyα Absorbers in the QSO OI 363


The galaxy giving rise to the damped Lyα absorbing system with z = 0.221 in the QSO OI 363 has been found. A galaxy that is probably associated with the second damped Lyα absorber (DLA) in the same QSO (z = 0.0912) has also been found. Neither galaxy is very luminous, and neither galaxy shows signs of extensive current star formation, a massive disk, or lots of gas. The impact parameters for both galaxies with respect to the QSO are reasonable. If most DLAs arise in such low-luminosity galaxies, it will be difficult to pick out the correct source galaxy for DLA systems at high redshift, given the large projected areal density on the sky of faint galaxies around distant QSOs.

Additional Information

© 2001 The American Astronomical Society. Received 2000 August 7; accepted 2000 December 5. Based in large part on observations obtained at the W. M. Keck Observatory, which is operated jointly by the California Institute of Technology and the University of California. The entire Keck/LRIS user community owes a huge debt to Jerry Nelson, Gerry Smith, Bev Oke, and many other people who have worked to make the Keck Telescope and LRIS a reality. We are grateful to the W. M. Keck Foundation and particularly to its late president, Howard Keck, for having the vision to fund the construction of the W. M. Keck Observatory. I thank C. Steidel and the anonymous referee for helpful comments.

Attached Files

Published - Cohen_2001_AJ_121_1275.pdf

Accepted Version - 0012109.pdf


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