X-Ray Bursts from the Transient Magnetar Candidate XTE J1810–197
X-Ray Bursts from the Transient Magnetar Candidate XTE J1810–197
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瞬态磁星候选 XTE J1810–197 发出的 X 射线爆发
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发表时间：
2005
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通讯作者：
M. Finger
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作者：
P. Woods;C. Kouveliotou;F. Gavriil;V. Kaspi;M. Roberts;A. Ibrahim;C. Markwardt;J. Swank;M. Finger
我们已经发现了四个X射线爆发，记录与罗西X射线定时探测器比例计数器阵列之间的2003年9月和2004年4月，我们表明，起源于瞬态磁星候选人XTE J1810-197。爆发形态包括一个短尖峰或多个尖峰，每个尖峰持续约1 s，随后是延长的发射尾部，其中XTE J1810-197的脉冲通量明显较高。突发尖峰可能与脉冲最大值相关，具有0.4%的随机相位分布的机会概率。爆发光谱最适合于温度为4-8 keV的黑体，比持续的X射线发射要难得多。在这些爆发之后的X射线尾期间，温度随着通量的下降而迅速冷却，在最初的爆发峰值之后保持恒定的发射半径。在最亮的X射线尾，我们检测到一个狭窄的发射线在12.6 keV，与1.4 keV的等效宽度和概率小于4 × 10-6的机会出现。这些爆发的时间和光谱特征与1 E 1048.1-5937观测到的爆发和1 E 2259+586观测到的爆发子集非常相似，因此XTE J1810-197被确定为候选磁星。从这三个物体检测到的爆发彼此足够相似，但与从软伽马中继器中看到的爆发有显着不同，它们可能代表了一种新的爆发类别，从磁星候选者中排除（到目前为止）异常X射线脉冲星样源。
We have discovered four X-ray bursts, recorded with the Rossi X-ray Timing Explorer Proportional Counter Array between 2003 September and 2004 April, that we show to originate from the transient magnetar candidate XTE J1810-197. The burst morphologies consist of a short spike or multiple spikes lasting ~1 s each, followed by extended tails of emission where the pulsed flux from XTE J1810-197 is significantly higher. The burst spikes are likely correlated with the pulse maxima, having a chance probability of a random phase distribution of 0.4%. The burst spectra are best fitted to a blackbody with temperatures 4-8 keV, considerably harder than the persistent X-ray emission. During the X-ray tails following these bursts, the temperature rapidly cools as the flux declines, maintaining a constant emitting radius after the initial burst peak. During the brightest X-ray tail, we detect a narrow emission line at 12.6 keV, with an equivalent width of 1.4 keV and a probability of chance occurrence of less than 4 × 10-6. The temporal and spectral characteristics of these bursts closely resemble the bursts seen from 1E 1048.1-5937 and a subset of the bursts detected from 1E 2259+586, thus establishing XTE J1810-197 as a magnetar candidate. The bursts detected from these three objects are sufficiently similar to one another, yet significantly different from those seen from soft gamma repeaters, that they likely represent a new class of bursts from magnetar candidates exclusive (thus far) to the anomalous X-ray pulsar-like sources.