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To fully exploit the potential of quasars as probes of cosmic chemicalevolution and the internal gas dynamics of galaxies it is important tounderstand the selection effects behind the quasar samples and in particular ifthe selection criteria exclude foreground galaxies with certain properties(most importantly a high dust content). Here we present spectroscopic follow-upfrom the 10.4-m GTC telescope of a dust-reddened quasar, eHAQ0111+0641, fromthe extended High A_V Quasar (HAQ) survey. We find that the z=3.21 quasar has aforeground Damped Lyman-alpha Absorber (DLA) at z=2.027 along the line ofsight. The DLA has very strong metal lines due to a moderately high metallicity(with an inferred lower limit of 25% of the solar metallicity), but a verylarge gas column density along the line-of-sight in its host galaxy. Thisdiscovery is further evidence that there is a dust bias affecting the census ofmetals, caused by the combined effect of dust obscuration and reddening, inexisting samples of z>2 DLAs. The case of eHAQ0111+0641 illustrates that dustbias is not only caused by dust obscuration, but also dust reddening.

The high A_V Quasar Survey: A z=2.027 metal-rich damped Lyman-alpha absorber towards a red quasar at z=3.21