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We report the discovery of a candidate stellar-mass black hole in the MilkyWay globular cluster M62. We detected the black hole candidate, which we termM62-VLA1, in the core of the cluster using deep radio continuum imaging fromthe Karl G. Jansky Very Large Array. M62-VLA1 is a faint source, with a fluxdensity of 18.7 +/- 1.9 microJy at 6.2 GHz and a flat radio spectrum(alpha=-0.24 +/- 0.42, for S_nu = nu^alpha). M62 is the second Milky Waycluster with a candidate stellar-mass black hole; unlike the two candidateblack holes previously found in the cluster M22, M62-VLA1 is associated with aChandra X-ray source, supporting its identification as a black hole X-raybinary. Measurements of its radio and X-ray luminosity, while not simultaneous,place M62-VLA1 squarely on the well-established radio--X-ray correlation forstellar-mass black holes. In archival Hubble Space Telescope imaging, M62-VLA1is coincident with a star near the lower red giant branch. This possibleoptical counterpart shows a blue excess, H alpha emission, and opticalvariability. The radio, X-ray, and optical properties of M62-VLA1 are verysimilar to those for V404 Cyg, one of the best-studied quiescent stellar-massblack holes. We cannot yet rule out alternative scenarios for the radio source,such as a flaring neutron star or background galaxy; future observations arenecessary to determine whether M62-VLA1 is indeed an accreting stellar-massblack hole.

A Radio-Selected Black Hole X-ray Binary Candidate in the Milky Way Globular Cluster M62