Period Clustering of the Anomalous X-Ray Pulsars and Magnetic Field Decay in Magnetars

  • Colpi M
  • Geppert U
  • Page D
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Abstract

We confront theoretical models for the rotational, magnetic, and thermal evolution of an ultramagnetized 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 s (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 timescale of the order of 10 4 yr.

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Colpi, M., Geppert, U., & Page, D. (2000). Period Clustering of the Anomalous X-Ray Pulsars and Magnetic Field Decay in Magnetars. The Astrophysical Journal, 529(1), L29–L32. https://doi.org/10.1086/312448

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