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Fig. 4

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Left: cumulative number of strong (wr(2796) > 1.0 Å) intervening Mg ii systems towards blazars versus β ≡ v/c, excluding the systems with Δv(zem,zabs) < 5000 km s-1 or β < 0.0167 (thicker, black curve). The curve of intermediate thickness (red) shows the predicted number of strong Mg ii systems, adopting the incidence of these systems towards QSOs derived by Prochter et al. (2006a), and the thinner (green) one is obtained by normalizing the latter to the total number of strong Mg ii systems towards blazars. Right: same for weak (0.3 < wr(2796) < 1.0 Å) Mg ii systems.

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