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| Paper: |
Long-Term Monitoring of Anomalous X-ray Pulsars |
| Volume: |
271, Neutron Stars in Supernova Remnants |
| Page: |
274 |
| Authors: |
Gavriil, F. P.; Kaspi, V. M.; Chakrabarty, D. |
| Abstract: |
We report on long-term monitoring of anomalous X-ray pulsars (AXPs) using the Rossi X-ray Timing Explorer. Using phase-coherent timing, we find a wide variety of behaviors among the sources, ranging from high stability (in 1E 2259.1+586 and 4U 0142+61), to instabilities so severe that phase-coherent timing is not possible (in 1E 1048.1-5937). We note a correlation in which timing stability in AXPs decreases with increasing nudot. The timing stability of soft gamma repeaters in quiescence is consistent with this trend, which is similar to one seen in radio pulsars. We consider high signal-to-noise ratio average pulse profiles as a function of energy for each AXP, and find a variety of behaviors. We find no large variability in pulse morphology nor in pulsed flux as a function of time. |
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