DESI Mg II absorbers produce average E(B-V) of about 0.04 for intervening systems and can bias quasar redshifts by up to about 0.005 at z > 1.5, with masking of the absorption lines partially recovering the bias.
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DESI Mg II Absorbers: Extinction Characteristics & Quasar Redshift Accuracy
DESI Mg II absorbers produce average E(B-V) of about 0.04 for intervening systems and can bias quasar redshifts by up to about 0.005 at z > 1.5, with masking of the absorption lines partially recovering the bias.