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Fig. 3

image

Central FUV-NUV vs. global NUV-r color-color diagram in the best sample (colored by redshift). For comparison, pale green dots show the location of the other BCGs. The vertical line indicates NUV-r = 5.4, above whichthere should be no contamination from young stars, and the horizontal line indicates FUV-NUV = 0.9, below which the UV slope is consistent with a UV upturn (Yi et al. 2011). Peculiarities found in our visual inspection (blue) or in the SDSS spectral subclass (red) are marked as in Fig. 2.

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