Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-05
Astron.J.131:686-700,2006
Astronomy and Astrophysics
Astrophysics
37 pages, 24 figures, 5 tables, Accepted on Oct. 26 2005 for publication in Astronomical Journal. The figures have been lowere
Scientific paper
10.1086/499299
We have carried out a high angular resolution near-infrared imaging study of the fields of 6 quasars with 7 strong absorption line systems at z < 0.5, using the Hokupa'a adaptive optics system and the QUIRC near-infrared camera on the Gemini-North telescope. These absorption systems include 4 classical damped Lyman-alpha absorbers (DLAs), 2 sub-DLAs, and one Lyman-limit system. Images were obtained in the H or K' filters with FWHM between 0.2"-0.5" with the goal of detecting the absorbing galaxies and identifying their morphologies. Features are seen at projected separations of 0.5"-16.0" from the quasars and all of the fields show features at less than 2" separation. We find candidate absorbers in all of the seven systems. With the assumption that some of these are associated with the absorbers, the absorbers are low luminosity < 0.1 L*_H or L*_K; we do not find any large bright candidate absorbers in any of our fields. Some fields show compact features that are too faint for quantitative morphology, but could arise in dwarf galaxies.
Chun Mark R.
Gharanfoli Soheila
Kulkarni Varsha P.
Takamiya Marianne
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