Selection of galaxies at 1.5 < z < 2.8 based on u∗ − VJ and VJ − i + colors. The galaxy tracks represented by the green and red solid curves correspond to the colors predicted as a function of redshift for two typical star-forming galaxy templates used by Ilbert et al. (2009) for determining of photometric redshifts in COSMOS. The dashed and dotted lines show the effect of dust extinction produced by E(B − V) = 0.1 and 0.2 assuming the law of Calzetti et al. (2000). The cross symbols along the tracks correspond to z = 0, 1, 1.5, 2, 2.8, and 3. The black solid lines show the limits of our modified BM/BX criterion. The distribution of the optically-selected COSMOS galaxies at 1.5 < z < 2.8 (black dots, limited for clarity to sources with i + < 25 and photometric uncertainties below 0.1 mag in u ∗ , VJ and i + ) illustrates the high reliability of our color selection.
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