2015MNRAS.448L..43K

If the ultraluminous source (ULX) M82 X-2 sustains its measured spin-up value of {dot}ν= 10^-10 s^-2, it will become a millisecond pulsar in less than 10⁵yr. The observed (isotropic) luminosity of 10⁴⁰erg/s also supports the notion that the neutron star will spin up to a millisecond period upon accreting about 0.1M_☉ - the reported hard X-ray luminosity of this ULX, together with the spin-up value, implies torques consistent with the accretion disc extending down to the vicinity of the stellar surface, as expected for low values of the stellar dipole magnetic field (B ≲ 10⁹G). This suggests a new channel of millisecond pulsar formation - in high-mass X-ray binaries - and may have implications for studies of gravitational waves, and possibly for the formation of low-mass black holes through accretion-induced collapse.