Cosmic Lumberjackery: The Search For Lyman Limit Systems

Details Cosmic Lumberjackery: The Search For Lyman Limit Systems Cosmic Lumberjackery: The Search For Lyman Limit Systems

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7201o&link_type=abstract

American Astronomical Society, AAS Meeting #211, #72.01; Bulletin of the American Astronomical Society, Vol. 39, p.863

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The study of absorption due to hydrogen towards distant quasars over the last three decades has dramatically influenced our understanding of the universe on many scales. The absorption line systems are typically broken into three groups by their neutral hydrogen content N(HI): the Lyman-alpha forest with log(N(HI)) < 16.0, the Lyman limit systems with 16.0 < log(N(HI)) < 20.2, and the damped Lyman-alpha systems with log(N(HI)) > 20.2. While the Lyman-alpha forest and the damped Lyman-alpha systems are well studied relatively well understood, the Lyman limit systems have received less scrutiny. In this talk, I describe an ongoing survey for Lyman limit absorption at all redshifts, using data from HST, SDSS, Keck and Magellan. I will present the latest results from this survey, which include the incidence frequency of the Lyman limit systems, constraints on their Hydrogen column density distribution, and their impact on the cosmological metal budget.

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