young brightest cluster galaxies

Moustakas showed Berlind and me some nice results on the spectral properties of the brightest cluster galaxies from Berlind's low-redshift cluster catalog. There is definitely a range in age or in young fraction (can't tell which), and they clearly contain significant AGN activity (I put AGN in quotation marks because it is not clear that LINER emission really comes directly from central black holes). This relates to my project on identification of the galaxies fading from blue to red, which I worked on refining and—of course—simplifying. Moustakas and Berlind are interested in understanding why some clusters have younger central galaxies. My interest is in understanding the process by which stellar mass gets from the blue population to the red.