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The formation and evolution of local brightest cluster galaxies (BCGs) isinvestigated by determining the stellar populations and dynamics from thegalaxy core, though the outskirts and into the intracluster light (ICL).Integral spectroscopy of 23 BCGs observed out to 4 r_e is collected and highsignal-to-noise regions are identified. Stellar population synthesis codes areused to determine the age, metallicity, velocity, and velocity dispersion ofstars within each region. The intracluster light (ICL) spectra are best modeledwith populations that are younger and less metal-rich than those of the BCGcores. The average BCG core age of the sample is 13.3$\pm$ 2.8 Gyr and theaverage metallicity is [Fe/H] = 0.30 $\pm$ 0.09, whereas for the ICL theaverage age is 9.2$\pm$3.5 Gyr and the average metallicity is [Fe/H] =0.18$\pm$0.16. The velocity dispersion profile is seen to be rising or flat inmost of the sample (17/23), and those with rising values reach the value of thehost cluster's velocity dispersion in several cases. The most extended BCGs areclosest to the peak of the cluster's X-ray luminosity. The results areconsistent with the idea that the BCG cores and inner regions formed quicklyand long ago, with the outer regions and ICL forming more recently, andcontinuing to assemble through minor merging. Any recent star formation in theBCGs is a minor component, and is associated with the cluster cool core status.

Clocking the formation of today's largest galaxies: Wide field integral spectroscopy of Brightest Cluster Galaxies and their surroundings