Astrophys. J., 849, 19-19 (2017/November-8)
The dipole magnetic field and spin-down evolutions of the high braking index pulsar PSR J1640-4631.
GAO Z.-F., WANG N., SHAN H., LI X.-D. and WANG W.
Abstract (from CDS):
In this work, we interpreted the high braking index of PSR J1640-4631 with a combination of the magneto-dipole radiation and dipole magnetic field decay models. By introducing a mean rotation energy conversion coefficient , the ratio of the total high-energy photon energy to the total rotation energy loss in the whole life of the pulsar, and combining the pulsar's high-energy and timing observations with a reliable nuclear equation of state, we estimate the pulsar's initial spin period, P0∼(17–44) ms, corresponding to the moment of inertia I∼(0.8–2.1)×1045 g cm2. Assuming that PSR J1640-4631 has experienced a long-term exponential decay of the dipole magnetic field, we calculate the true age tage, the effective magnetic field decay timescale τD, and the initial surface dipole magnetic field at the pole Bp(0) of the pulsar to be 2900-3100 yr, 1.07(2)×105 yr, and (1.84–4.20)×1013 G, respectively. The measured braking index of n=3.15(3) for PSR J1640-4631 is attributed to its long-term dipole magnetic field decay and a low magnetic field decay rate, dBp/dt∼-(1.66–3.85)×108 G yr–1. Our model can be applied to both the high braking index (n 3) and low braking index (n 3) pulsars, tested by the future polarization, timing, and high-energy observations of PSR J1640-4631.
© 2017. The American Astronomical Society.
ISM: supernova remnants - magnetic field: neutron - pulsars: individual: J1640-4631 - stars: evolution - stars: evolution
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