Magnetars

Computer Science

Scientific paper

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Neutron Stars, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Magnetars are defined as neutron stars with dipole fields in excess of BQED≡m2ec3/eℏ=4.4×1013 G. We describe how such stars could form through the action of an α-Ω dynamo during the first 10-30 seconds after neutron star birth. Magnetars constitute a class of neutron stars distinct from pulsars, in which magnetic energy, rather than rotational energy, plays the dominant role in powering emissions. Possible observable manifestations of magnetars include soft gamma repeaters (SGRs), anomalous X-ray pulsars (AXPs), and classical gamma-ray bursts (GRBs). AXPs are soft-spectrum, pulsating X-ray sources with histories of uniform spindown and no evident companions. We estimate their recoil velocities and, in the context of the magnetar model, their dipole magnetic field strengths.

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