Abstract
We analyse the scatter in the correlation between super-massive black hole
(SMBH) mass and bulge stellar mass of the host galaxy, and infer that it cannot
be accounted for by mergers alone. The merger-only scenario, where small
galaxies merge to establish a proportionality relation between the SMBH and
bulge masses, leads to a scatter around the linear proportionality line that
increases with the square root of the SMBH (or bulge) mass. By examining a
sample of 96 galaxies we find that the intrinsic scatter increases more rapidly
than expected from the merger-only scenario. The correlation between SMBH
masses and their host galaxy properties is therefore more likely to be
determined by a negative feedback mechanism that is driven by an active
galactic nucleus. We find a hint that some galaxies with missing stellar mass
reside close to the centre of clusters. We propose that ram-pressure stripping
of gas off the young galaxy as it moves near the cluster centre, might explain
the missing stellar mass at later times.
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