Fig. 3
VRI colour image of MACSJ1147.3-1252 obtained with the UH2.2 m telescope in variable conditions in February 2008. The dashed lines mark the 1 and 2σ error circles (derived using the entire MACS cluster sample) around the nominal RASS X-ray position for this 22-photon detection. Arrows point to the two competing optical counterparts of this X-ray source: The 6dF quasar g1147207-125310 (z = 0.497) and the galaxy cluster LCDCS S031 (z = 0.580). (This figure is available in color in electronic form.)
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