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Fig. 9.

image

Tests of a possible LBG selection bias. Upper panel: shift of F606W magnitude due to contamination of Lyα emission as a function of redshift. Green, red, and violet lines show the shifts for EW(Lyα) = 25 Å, EW(Lyα) = 50 Å, and EW(Lyα) = 100 Å, respectively. Lower panel: color-color diagram for B (F435W)-dropouts: F435WF606W as a function of F606WF850LP. The grey, green, red, and violet points indicate UV selected galaxies with −20.25 ≤ M1500 ≤ −18.75 mag at zp = 3.5–4.5, those with EW(Lyα) = 20–50 Å, EW(Lyα) = 50–100 Å, and EW(Lyα) ≥ 100 Å, respectively. The black line represents the color-color criteria for B-dropout. Green, red, and violet arrows show the shifts of colors due to contamination of Lyα emission to F606W at z ≈ 4 and z ≈ 4.5 for EW(Lyα) = 25 Å, EW(Lyα) = 50 Å, and EW(Lyα) = 100 Å, respectively.

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