Long-Term RXTE Monitoring of the Anomalous X-ray Pulsar 1E 1048.1-5937

Details Long-Term RXTE Monitoring of the Anomalous X-ray Pulsar 1E 1048.1-5937 Long-Term RXTE Monitoring of the Anomalous X-ray Pulsar 1E 1048.1-5937

2000-11-20

arxiv.org/abs/astro-ph/0011368v2

Astronomy and Astrophysics

Astrophysics

27 pages, 4 figures, to appear in August issue of ApJ. Revised text and Figure 3

Scientific paper

10.1086/321682

We report on long-term monitoring of the anomalous X-ray pulsar (AXP) 1E 1048.1-5937 using the Rossi X-ray Timing Explorer (RXTE). The timing behavior of this pulsar is different from that of other AXPs being monitored with RXTE. In particular, we show that the pulsar shows significant deviations from simple spin-down such that phase-coherent timing has not been possible over time spans longer than a few months. We find that the deviations from simple spin down are not consistent with single "glitch" type events, nor are they consistent with radiative precession. We show that in spite of the rotational irregularities, the pulsar exhibits neither pulse profile changes nor large pulsed flux variations. We discuss the implications of our results for AXP models. In the context of the magnetar model, we suggest that 1E 1048.1-5937 may be a transition object between the soft gamma-ray repeater and AXP populations, and the AXP most likely to one day undergo an outburst.

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