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We present a search for "hyper-compact" star clusters in the Milky Way usinga combination of Gaia and the Dark Energy Camera Legacy Survey (DECaLS). Suchputative clusters, with sizes of ~1 pc and containing 500-5000 stars, areexpected to remain bound to intermediate-mass black holes (Mbh~10^3-10^5 M-sun)that may be accreted into the Milky Way halo within dwarf satellites. Using thesemi-analytic model SatGen we find an expected ~100 wandering intermediate-massblack holes with if every infalling satellite hosts a black hole. We do notfind any such clusters in our search. Our upper limits rule out 100% occupancy,but do not put stringent constraints on the occupation fraction. Of course, weneed stronger constraints on the properties of the putative star clusters,including their assumed sizes as well as the fraction of stars that would becompact remnants.

A Search for Wandering Black Holes in the Milky Way with Gaia and DECaLS