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Period clustering of the Anomalous X-ray Pulsars and magnetic field decay in magnetars

Monica Colpi·Ulrich Geppert·Dany Page
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Abstract

We confront theoretical models for the rotational, magnetic, and thermal evolution of an ultra-magnetized neutron star, or magnetar, with available data on the Anomalous X-ray Pulsars (AXPs). We argue that, if the AXPs are interpreted as magnetars, their clustering of spin periods between 6 and 12 seconds, observed at present in this class of objects, their period derivatives, their thermal X-ray luminosities, and the association of two of them with young supernova remnants, can only be understood globally if the magnetic field in magnetars decays significantly on a time scale of the order of 10^4 years.

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Monica Colpi, Ulrich Geppert, Dany Page. 1999-12-03. Period clustering of the Anomalous X-ray Pulsars and magnetic field decay in magnetars. https://doi.org/10.1086/312448

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