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.
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 [10.1086/312448].
Period clustering of the anomalous X-ray pulsars and magnetic field decay in magnetars
COLPI, MONICA;
2000
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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