An Imaging and Spectroscopic Study of thezabs = 3.38639 Damped Lyα System in Q0201+1120: Clues to Star Formation at High Redshift

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Abstract
We present the results of a series of imaging and spectroscopic observations aimed at identifying and studying the galaxy responsible for the zabs = 3.38639 damped Lyα system in the zem = 3.61 quasar Q0201+1120. We find that the damped Lyα systems (DLA) is part of a concentration of matter that includes at least four galaxies (probably many more) over linear comoving dimensions greater than 5 h-1 Mpc. The absorber may be a 0.7L* galaxy at an impact parameter of 15 h-1 kpc, but follow-up spectroscopy is still required for positive identification. The gas is turbulent, with many absorption components distributed over ~270 km s-1 and a large spin temperature, Ts 4000 K. The metallicity is relatively high for this redshift, ZDLA 1/20 Z☉. From consideration of the relative ratios of elements that have different nucleosynthetic timescales, it would appear that the last major episode of star formation in this DLA occurred at z 4.3, more than ~500 Myr prior to the time when we observe it.
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