We study a sample of eight massive galaxies that are extreme outliers ( 3 - 5 \sigma ) in the M _ { \bullet } - M _ { \mathrm { bulge } } local scaling relation .
Two of these galaxies are confirmed to host extremely large super massive black holes ( SMBHs ) , whereas the virial mass estimates for the other six are also consistent with having abnormally large SMBHs .
From the analysis of their star formation histories and their structural properties we find that all these extreme outliers can be considered as relic galaxies from the early ( z \sim 2 ) Universe : i.e .
they are compact ( R _ { \mathrm { e } } < 2 kpc ) and have purely old stellar populations ( t \gtrsim 10 Gyr ) .
In order to explain the nature of such deviations from the local relations , we propose a scenario in which the hosts of these über-massive SMBHs are galaxies that have followed a different evolutionary path than the two-phase growth channel assumed for massive galaxies .
Once the SMBH and the core of the galaxy are formed at z \sim 2 , the galaxy skips the second phase , remaining structurally untouched and without further mass and size increase .
We show that if the outliers had followed the normal evolutionary path by growing in size via merger activity , the expected ( mild ) growth in mass would place them closer to the observed local relations .
Our results suggest that the SMBH growth epoch for the most massive galaxies stopped \sim 10 Gyr ago .