Chemical history at z ≥ 2.0: first results from the Magellan+KECK survey of Lyman limit systems

Details Chemical history at z ≥ 2.0: first results from the Magellan+KECK survey of Lyman limit systems Chemical history at z ≥ 2.0: first results from the Magellan+KECK survey of Lyman limit systems

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pgqa.conf..463o&link_type=abstract

Probing Galaxies through Quasar Absorption Lines, IAU Colloquium Proceedings of the International Astronomical Union 199, held M

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a measurement of [{O}/{Fe}] versus [{Fe}/{H}] in the z>2 igm derived from a sample of 23 Lyman limit systems whose column density lies in the range 19.0≤log NHI≤ 20.2 cm-2. The systems span a metallicity range of -2.70 ≤ [{Fe}/{H}]≤ -0.50, allowing for a direct comparison with similar studies of stars within the milky way. Although the Lyman limit systems can be highly ionised, the effects of ionisation on the determination of [{O}/{Fe}] is minor for most of the systems in the sample. The data appear to show a decrease in [{O}/{Fe}] with increasing metallicity with an approximate slope of m≃-0.55. We also determine a best fit power law slope of α=-1.86 ± 0.2 to the column density distribution fHI(N) for 19.0 ≤log NHI≤ 20.2 cm-2.

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