Fig. 12
Luminosity-normalised PNLFs for the bulge of M 31 (triangles) and the halo of M 87 (circles). Open circles and filled circles represent, respectively, the PNLF of the halo of M 87 before and after subtraction of the expected number of Lyα contaminants in each bin. Data are binned into 0.25 mag intervals. M 87 has a higher number of faint PNs per unit bolometric luminosity and its PNLF has a steeper slope towards faint magnitudes than M 31.
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