A Small Magnetic Inclination Model For The Paucity Of Accreting Millisecond X-ray Pulsars

Statistics – Computation

Scientific paper

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Scientific paper

Given their status as progenitors of rotation-powered millisecond radio pulsars, it is somewhat surprising that accretion-powered millisecond X-ray pulsars are so rare, and that all current examples are transient sources. We show that this and other phenomenology can be explained by a model in which the magnetic poles are close to one or both rotational poles. Accreting gas is therefore channeled close to the rotational poles, leading to oscillations that have low amplitudes, are nearly sinusoidal, and can exhibit large phase variations. We present general relativistic ray-tracing computations and population studies using such a model and compare the results with observations. These results are based on research supported by NASA grant NAG 5-12030, NSF grant AST0709015, and funds of the Fortner Endowed Chair at Illinois, and by NSF grant AST0708424 at Maryland.

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