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F. P. Gavriil (McGill), V. M. Kaspi (McGill / MIT), D. Chakrabarty (MIT )
The nature of anomalous X-ray pulsars (AXPs) has been a mystery since the discovery of the first example some 20 years ago. The leading model for AXPs is that they are isolated ultra-magnetized neutron stars, or "magnetars". It has also been suggested that AXPs might be accreting from an accretion disk made up of fall-back material. In order to test these models, the Rossi X-ray Timing Explorer (RXTE) has been used to observe all 5 known AXPs, as part of a long-term monitoring project. ln this poster we will present recent results from this project, including the sources' timing properties as deduced from phase-coherent studies, the sources' pulsed flux-time series and pulse morphology histories. We will also present recent results from searches for mini-outbursts as are observed in SGRs, as well as for quasi-periodic oscillations (QPOs) as observed in accreting X-ray pulsars.
This work is funded by NASA and NSERC.
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