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Among the compact objects observed in gravitational wave merger events a fewhave masses in the gap between the most massive neutron stars (NSs) and leastmassive black holes (BHs) known. Their nature and the formation of theirmerging binaries are not well understood. We report on pulsar timingobservations using the Karoo Array Telescope (MeerKAT) of PSR J0514-4002E, aneccentric binary millisecond pulsar in the globular cluster NGC 1851 with atotal binary mass of $3.887 \pm 0.004$ solar masses. The companion to thepulsar is a compact object and its mass (between $2.09$ and $2.71$ solarmasses, 95% confidence interval) is in the mass gap, so it either is a verymassive NS or a low-mass BH. We propose the companion was formed by a mergerbetween two earlier NSs.

A pulsar in a binary with a compact object in the mass gap between neutron stars and black holes