Fig. 1

Top panel: probability of an arbitrary high-redshift ALHAMBRA galaxy with observed magnitude I = 22.93 ± 0.11 in z – M UV space. Bottom: the above function convolved with the source function, S (I 0 |I, σ I ), gives the probability in z – M UV space for the real magnitude I 0. In both figures the white dot marks the maximum likelihood redshift, z ML, and the corresponding M UV,ML, labelled in the panel. The red line indicates the applied I 0 = 24 limiting magnitude, and the accessible total volume is shown as shaded grey area.
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