The Evolution of Weak MgII Absorbers from 0 < z < 2.4.

Details The Evolution of Weak MgII Absorbers from 0 < z < 2.4. The Evolution of Weak MgII Absorbers from 0 < z < 2.4.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7705n&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.05; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from a VLT/UVES survey of weak absorbers in the redshift interval 0.4 < z < 2.4. Using 81 quasar spectra extracted from the ESO archive, we were able to identify 112 weak systems in a survey that is 84% complete down to a rest-frame equivalent width limit of Wr(2796) = 0.02 Angstrom. Based on this identified sample, we present results on the statistical properties of weak MgII absorbers, the redshift number density (dN/dz) for single and multiple cloud weak systems and the equivalent width distribution. Synthesizing results from previous weak and strong MgII surveys, we also demonstrate an evolution in the incidence of weak systems from redshift 2.4 to the present. Based on these results, we discuss the physical nature of weak systems and the potential processes that could be responsible for the observed evolution.

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