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arXiv astro-ph/0011368astro-ph
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异常X射线脉冲星1 E 1048.1-5937的长期RXTE监测

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

Victoria M. Kaspi, Fotis P. Gavriil, Deepto Chakrabarty, Jessica R. Lackey, Michael P. Muno

摘要:

本文报道了利用Rossi X射线定时探测器(RXTE)对异常X射线脉冲星(AXP)1 E 1048.1-5937的长期观测。这颗脉冲星的计时行为与RXTE监测的其他AXP不同。特别是,我们表明,脉冲星显示出显着的偏差,从简单的自旋下降,使相位相干定时已不可能超过几个月的时间跨度。我们发现,从简单的自旋下降的偏差是不一致的单一的“毛刺”类型的事件,也不符合辐射岁差。我们发现,尽管旋转的不规则性,脉冲星既没有表现出脉冲轮廓的变化,也没有大的脉冲通量变化。我们讨论了我们的研究结果对AXP模型的影响。在磁星模型的背景下,我们认为,1 E 1048.1-5937可能是一个过渡对象之间的软伽马射线中继器和AXP人口,和AXP最有可能有一天经历一次爆发。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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