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A population of intermediate-mass black holes (BHs) is predicted to be freelyfloating in the Milky Way (MW) halo, due to gravitational wave recoil, ejectionfrom triple BH systems, or tidal stripping in the dwarf galaxies that merged tomake the MW. As these BHs traverse the gaseous MW disk, a bow shock forms,producing detectable radio and mm/sub-mm synchrotron emission from acceleratedelectrons. We calculate the synchrotron flux to be $\sim \rm 0.01-10\, mJy$ atGHz frequency, detectable by Jansky Very Large Array, and $\sim 10-100\,\mu\rmJy$ at $\sim10^{10}-10^{12} \,\rm Hz$ frequencies, detectable by Atacama LargeMillimeter/sub-millimter Array. The discovery of the floating BH populationwill provide insights on the formation and merger history of the MW as well ason the evolution of massive BHs in the early Universe.

Detecting floating black holes as they traverse the gas disk of the Milky Way