Imaging and spectroscopy of galaxies associated with two z~0.7 damped Lyman-alpha absorption systems

Details Imaging and spectroscopy of galaxies associated with two z~0.7 damped Lyman-alpha absorption systems Imaging and spectroscopy of galaxies associated with two z~0.7 damped Lyman-alpha absorption systems

2003-08-11

arxiv.org/abs/astro-ph/0308193v1

Astron.J.126:2230,2003

Astronomy and Astrophysics

Astrophysics

9 pages, to appear in AJ, November 2003 issue

Scientific paper

10.1086/378957

We have identified galaxies near two quasars which are at the redshift of damped Lyman-alpha (DLA) systems in the UV spectra of the quasars. Both galaxies are actively forming stars. One galaxy has a luminosity close to the break in the local galaxy luminosity function, L*, the other is significantly fainter than L* and appears to be interacting with a nearby companion. Despite the strong selection effects favoring spectroscopic identification of the most luminous DLA galaxies, many of the spectroscopically-identified DLA galaxies in the literature are sub-L*, suggesting that the majority of the DLA population is probably sub-L*, in contrast to MgII absorbers at similar redshifts whose mean luminosity is close to L*.

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