We use the hydrodynamic EAGLE simulation to predict the numbers and masses of
supermassive black holes in stripped nuclei and compare these to confirmed
measurements of black holes in observed UCDs. We find that black holes in
stripped nuclei are consistent with the numbers and masses of those in observed
UCDs. Approximately 50 per cent of stripped nuclei with M>2Γ106Mββ should contain supermassive black holes. We further calculate a mass
elevation ratio, Ξ¨ of the population of simulated stripped nuclei of
Ξ¨simβ=1.51β0.04+0.06β for M>107Mββ stripped nuclei,
consistent with that of observed UCDs which have Ξ¨obsβ=1.7Β±0.2
above M>107Mββ. We also find that the mass elevation ratios of
stripped nuclei with supermassive black holes can explain the observed number
of UCDs with elevated mass-to-light ratios. Finally, we predict the relative
number of massive black holes in stripped nuclei and galaxy nuclei and find
that stripped nuclei should increase the number of black holes in galaxy
clusters by 30-100 per cent, depending on the black hole occupation fraction of
low-mass galaxies. We conclude that the population of supermassive black holes
in UCDs represents a large and unaccounted-for portion of supermassive black
holes in galaxy clusters.Comment: 14 pages, Submitted to MNRA