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An ultraluminous nascent millisecond pulsar.

Abstract : 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 105 yr. The observed (isotropic) luminosity of 1040 erg s-1 also supports the notion that the neutron star will spin up to a millisecond period upon accreting about 0.1 M - 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 ≲ 109 G). 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.
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Submitted on : Monday, April 25, 2022 - 10:51:01 AM
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W. Kluzniak, J. -P. Lasota. An ultraluminous nascent millisecond pulsar.. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2015, 448, pp.L43-L47. ⟨10.1093/mnrasl/slu200⟩. ⟨insu-03645152⟩



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