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Numerical relativity predicts that the coalescence of a black hole-binarycauses the newly formed black hole to recoil, and evidence for such recoils hasbeen found in the gravitational waves observed during the merger ofstellar-mass black holes. Recoiling (super)massive black holes are expected toreside in hypercompact stellar clusters (HCSCs). Simulations of galaxy assemblypredict that hundreds of HCSCs should be present in the halo of a MilkyWay-type galaxy, and a fraction of those around the Milky Way should havemagnitudes within the sensitivity limit of existing surveys. However, recoilingblack holes and their HCSCs are still waiting to be securely identified. Withthe goal of enabling searches through recent and forthcoming databases, weimprove over existing literature to produce realistic renditions of HCSCs boundto black holes with a mass of 10$^{5}$ M$_{\odot}$. Including the effects of apopulation of blue stragglers, we simulate their appearance in Pan-STARRS andin forthcoming $Euclid$ images. We also derive broad-band spectra and thecorresponding multi-wavelength colours, finding that the great majority of thesimulated HCSCs fall on the colour-colour loci defined by stars and galaxies,with their spectra resembling those of giant K-type stars. We discuss theclusters properties, search strategies, and possible interlopers.

Hypercompact stellar clusters: morphological renditions and spectro-photometric models