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The UCSD HIRES/KECK I Damped Lya Abundance Database: IV. Probing Galactic Enrichment Histories with Nitrogen
Jason X. Prochaska, Richard B. C. Henry, John M. O'Meara +5
We present 14 N^0 measurements from our HIRES/Keck database of damped Lya abundances. These data are combined with measurements from the recent and past literature to build an homo…
Metallicity Evolution of Damped Lyman Alpha Systems In Lambda CDM Cosmology
Renyue Cen, Jeremiah P. Ostriker, Jason X. Prochaska +1
Utilizing a new, high mass resolution hydrodynamic simulation we compute the metallicity evolution of damped Lyman alpha systems (DLAs) and find a reasonable agreement with observa…
The UCSD HIRES/KeckI Damped Lya Abundance Database III. An Empirical Study of Photoionization in the Damped Lya System Toward GB1759+7539
Jason X. Prochaska, J. Christopher Howk, John M. O'Meara +5
We investigate the ionization state of the damped Lya system at z=2.62 toward GB1759+7539 through an analysis of ionic ratios sensitive to photoionization: ArI/SII, FeIII/FeII, NII…
Galaxies Associated with z~4 Damped Lya Systems: I. Imaging and Photometric Selection
Jason X. Prochaska, Eric Gawiser, Arthur M. Wolfe +5
This paper describes the acquisition and analysis of imaging data for the identification of galaxies associated with z~4 damped Lya systems. We present deep BRI images of three fie…