SGR 1806 20 about two years after the giant flare: Suzaku, XMM-Newton and INTEGRAL observations
SGR 1806 20 about two years after the giant flare: Suzaku, XMM-Newton and INTEGRAL observations
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DOI：
10.1051/0004-6361:20078562
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发表时间：
2007-10
影响因子：
6.5
通讯作者：
P. Esposito;S. Mereghetti;A. Tiengo;S. Zane;R. Turolla;D. Gotz;N. Rea;N. Kawai;M. Ueno;G. Israel;L. Stella;M. Feroci
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文献类型：
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作者：
P. Esposito;S. Mereghetti;A. Tiengo;S. Zane;R. Turolla;D. Gotz;N. Rea;N. Kawai;M. Ueno;G. Israel;L. Stella;M. Feroci
2004 年 12 月，软伽马射线中继器 SGR 1806-20 发射了迄今为止观测到的最强大的巨型耀斑。这可能涉及磁层的大规模重新排列，导致其 X 射线发射特性发生可观察到的变化。在这里，我们展示了 SGR 1806-20 的首次朱雀观测结果，以及 XMM-Newton 和 INTEGRAL 几乎同时进行的观测结果。源似乎已经达到了一种状态，其特征是通量接近耀斑前的水平，并且光谱相对较软。尽管如此，SGR 1806-20 在巨大耀斑之后仍然相当活跃，使我们能够研究朱雀在 1-100 keV 范围内观察到的几次短爆发。我们在磁星模型的背景下讨论了 SGR 1806-20 的宽带光谱特性，涵盖持续发射和爆发发射，并考虑其最新的理论发展。
In December 2004, the soft gamma-ray repeater SGR 1806-20 emitted the most powerful giant flare ever observed. This probably involved a large-scale rearrangement of the magnetosphere leading to observable variations in the properties of its X-ray emission. Here we present the results of the first Suzaku observation of SGR 1806-20, together with almost simultaneous observations with XMM-Newton and INTEGRAL. The source seems to have reached a state characterized by a flux close to the pre-flare level and by a relatively soft spectrum. Despite this, SGR 1806-20 also remained quite active after the giant flare, allowing us to study several short bursts observed by Suzaku in the 1-100 keV range. We discuss the broad-band spectral properties of SGR 1806-20, covering both persistent and bursting emission, in the context of the magnetar model, and consider its recent theoretical developments.