Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.2704s&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #27.04; Bulletin of the American Astronomical Society, Vol. 24, p.1162
Astronomy and Astrophysics
Astronomy
Scientific paper
The high HI column density Lyman Limit absorption line systems (LLS) are the parent population from which absorbers that are selected on the basis of MgII absorption are drawn. At z=0.5--1.0 the MgII systems have been shown to be associated with the extended halos of bright galaxies (Bergeron & Boisse 1991). Recent work on LLS evolution by Sargent, Steidel & Boksenberg(1989) and Lanzetta(1991) disagree considerably in the form of evolution observed. Whilst SSB claim no evolution in number density up to z=3.5, Lanzetta reports evidence for strong evolution in the number density of LLS for z > 2.5. We shall present results of a low resolution absorption line study of z>4 quasars. The z>4 quasar sample is the ~ 20 brightest non-BAL quasars from the APM z>4 quasar survey. Our observations have been combined with HST observations in low redshift quasars to enable a new determination of the evolution of LLS over the redshift range 0.5 to 4.5. These observations extend absorption line studies to higher redshifts than have been possible before.
Hazard Cyril
Irwin Mary Jane
McMahon Richard G.
Storrie-Lombardi Lisa J.
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