A HST Survey of Lyman Limit Systems at z < 2

Details A HST Survey of Lyman Limit Systems at z < 2 A HST Survey of Lyman Limit Systems at z < 2

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348201r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #482.01; Bulletin of the American Astronomical Society, Vol. 41, p.450

Astronomy and Astrophysics

Astronomy

Scientific paper

QSO absorbers with HI columns between the Lyman-alpha forest and damped Lyman-alpha systems, aka Lyman limit systems (LLS), are likely associated with galaxies, their outflows, and their interactions with the diffuse intergalactic medium. As such, they provide a key tool in understanding the formation and evolution of galaxies, the distribution of metals in galaxies and the universe, and the overall structure of the universe. Despite their importance, LLS are the least understood of the QSO absorbers, especially at low redshift (z < 2) where observations require the space UV telescopes. We present a statistical survey of LLS (redshift density and column density frequency distribution), including for the first time partial LLS, at z < 2 using archival spectroscopic data (FOS, STIS) from the Hubble Space Telescope. We study the evolution of these systems by comparing our results with ongoing surveys at z > 2.

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