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arXiv 1107.4050astro-ph.HE
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来自SGR 1806-20爆发的扩展尾部

Extended Tails from SGR 1806-20 Bursts

Ersin Gogus, Peter Woods, Chryssa Kouveliotou, Mark H. Finger, Valentin Pal'shin, Yuki Kaneko, Sergei Golenetskii, Dmitry Frederiks, Carol Airhart

摘要:

2004年,SGR 1806-20经历了一段强烈而持久的爆发活动,其中包括2004年12月27日的巨大耀斑-这是地球上探测到的最强烈的太阳外瞬变事件。在这个活跃的插曲,我们经常监测源与罗西X射线定时探测器,偶尔与钱德拉。在这些观测过程中,我们发现了两个相对明亮的爆发,在硬X射线中观察到Konus-Wind,随后是持续数百到数千秒的延长X射线尾巴或余辉。在这里,我们提出了详细的光谱和时间分析,这些事件观察到约6和1.5个月前2004年12月27日的巨型耀斑。我们发现,这两个X射线尾巴是一致的冷却黑体的恒定半径。这些光谱结果与SGR 1900+14和最近SGR 1550-5418记录到的爆发余辉在性质上相似。然而,后两个源的脉冲X射线强度在爆发后显着增加,而我们在SGR 1806-20事件期间没有检测到RMS脉冲幅度的任何显着变化。此外,我们发现,分割到爆发(即时能量释放)和尾部(余辉)的能量的分数由SGR 1900+14和SGR 1806-20之间的数量级不同。我们认为,这种差异可以归因于这些中子星的地壳加热机制的差异结合发射区的几何形状。

英文摘要:

In 2004, SGR 1806-20 underwent a period of intense and long-lasting burst activity that included the giant flare of 27 December 2004 -- the most intense extra-solar transient event ever detected at Earth. During this active episode, we routinely monitored the source with Rossi X-ray Timing Explorer and occasionally with Chandra. During the course of these observations, we identified two relatively bright bursts observed with Konus-Wind in hard X-rays that were followed by extended X-ray tails or afterglows lasting hundreds to thousands of seconds. Here, we present detailed spectral and temporal analysis of these events observed about 6 and 1.5 months prior to the 27 December 2004 Giant Flare. We find that both X-ray tails are consistent with a cooling blackbody of constant radius. These spectral results are qualitatively similar to those of the burst afterglows recorded from SGR 1900+14 and recently from SGR 1550-5418. However, the latter two sources exhibit significant increase in their pulsed X-ray intensity following the burst, while we did not detect any significant changes in the RMS pulsed amplitude during the SGR 1806-20 events. Moreover, we find that the fraction of energy partitioned to the burst (prompt energy release) and the tail (afterglow) differs by an order of magnitude between SGR 1900+14 and SGR 1806-20. We suggest that such differences can be attributed to differences in the crustal heating mechanism of these neutron stars combined with the geometry of the emitting areas.

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