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They've looked everywhere for HCSS's and haven't found any so far (doesn't mean to say they don't exist, just that they haven't found one). However, any dense, compact stellar association like that would tend to gravitationally collapse unless the individual stars are traveling at high orbital velocities. In which case, the BH at their centre would get larger if they collapsed onto it. If that happened, you'd have Buckley's chance of seeing it unless it lensed an object...like a distant galaxy.
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