Giant Flare of SGR 1806-20 from a Relativistic Jet
Giant Flare of SGR 1806-20 from a Relativistic Jet
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DOI：
10.1093/pasj/57.3.l11
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发表时间：
2005-02
期刊：
影响因子：
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通讯作者：
R. Yamazaki;K. Ioka;F. Takahara;N. Shibazaki
中科院分区：
文献类型：
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作者：
R. Yamazaki;K. Ioka;F. Takahara;N. Shibazaki
日本磁层探测器GEOTAIL于2004年12月27日记录了SGR 1806-20巨大耀斑初始峰值的详细光变曲线。我们发现，所观察到的光变曲线很好地解释了相对论膨胀火球，如伽马射线暴（GRBs）的排放。特别是，观察到的快速衰落后500毫秒表明，喷出物在射流准直。我们推导出的上限喷流开口的半角为0.2弧度，这是窄的伽玛暴。观察到的无线电图像的质心的适当运动也表明准直流出。本文还讨论了避免“统计”问题的可能途径。
The Japanese magnetospheric explorer, GEOTAIL, recorded a detailed light curve of the initial spike of a giant flare from SGR 1806-20 on 27 December 2004. We show that the observed light curve is well explained by emission from relativistically expanding fireballs, like those of gamma-ray bursts (GRBs). Especially, the observed rapid fading after 500 msec suggests that ejecta was collimated in a jet. We derived an upper limit on the jet opening halfangle of 0.2 rad, which is as narrow as those of GRBs. Observed proper motion of a centroid of a radio image also suggests the collimated outflow. Possible way to avoid the ''statistical'' problem is also discussed.