The Chemical Evolution of QSO Absorbers

Details The Chemical Evolution of QSO Absorbers The Chemical Evolution of QSO Absorbers

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.........1e&link_type=abstract

PhD thesis, University of Cambridge

Physics

8

Quasar, Absorption, Chemical, Evolution, Damped, Lyman, Alpha, Systems, Forest

Scientific paper

The chemical evolution of the high redshift intergalactic and interstellar media of galaxies is studied using QSO absorption lines. The redshift evolution of damped Lyman alpha (DLA) system metallicity is studied down to z=0.5, and no significant increase in metals is found. The CIV/HI ratio in the Lyman alpha forest is investigated at z approximately 3 and traces of are metals found in the low density HI gas with optical depth of around 1. Finally, a new survey for DLAs in a radio-selected sample of QSOs is presented, with the aim of determining whether a significant dust bias may have affected previous surveys.

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