SIMBAD references

2009MNRAS.397..467E - Mon. Not. R. Astron. Soc., 397, 467-478 (2009/July-3)

Assessing the dust selection bias in quasar absorbers at 0.7 < z < 1.6: Zn/Fe abundances in a radio-selected sample.


Abstract (from CDS):

The Complete Optical and Radio Absorption Line System (CORALS) survey has previously been used to demonstrate that the number density, gas and metals content of z > 1.6 damped Lyman alpha (DLA) systems is not significantly underestimated in magnitude limited surveys. In this paper, a sample of strong Mgii absorbers selected from the optically complete 0.7 < z < 1.6 CORALS sample of Ellison et al. is used to assess the potential of dust bias at intermediate redshifts. From echelle spectra of all CORALS absorbers with Mgii λ2796 and Feii λ2600 rest equivalent widths >0.5 Å in the redshift range 0.7 < z < 1.6, we determine column densities of Zn, Cr, Fe, Mn and Si. The range of dust-to-metals ratios and inferred number density of DLAs from the D-index are consistent with optical samples. We also report the discovery of four new absorbers in the echelle data in the redshift range 1.7 < z < 2.0, two of which are confirmed DLAs and one is a sub-DLA, whilst the Lyα line is not covered for the fourth.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: high redshift - quasars: absorption lines

Simbad objects: 17

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