Paper:	Propeller vs. Magnetar Concepts for SGRs/AXPs
Volume:	271, Neutron Stars in Supernova Remnants
Page:	257
Authors:	Rothschild, R. E.; Lingenfelter, R. E.; Marsden, D.
Abstract:	Two lines of thought exist as to the nature of Soft Gamma-ray Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs). On the one hand, Duncan &Thompson (1992) and Thompson &Duncan (1995) propose neutron stars with super-critical (>1014 G) magnetic fields, which spin-down the stars and power the gamma-ray bursts. On the other hand, several authors (van Paradijs, Taam &van den Heuvel 1995; Chatterjee, Hernquist &Narayan 2000; Alpar 2001; Marsden et al. 2001; Menou, Perna &Hernquist 2001) propose neutron stars with typical pulsar magnetic fields (~1012 G), which are spun-down by magnetospheric ``propeller'' torques from fallback or fossil disks in addition to magnetic dipole radiation. We discuss these two concepts in light of various observations.

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