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arXiv 0710.2789astro-ph
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大耀斑后约两年的SGR 1806-20:朱雀、XMM-牛顿和INTEGRAL观测

SGR 1806-20 about two years after the giant flare: Suzaku, XMM-Newton and INTEGRAL observations

P. Esposito, S. Mereghetti, A. Tiengo, S. Zane, R. Turolla, D. Gotz, N. Rea, N. Kawai, M. Ueno, G. L. Israel, L. Stella, M. Feroci

摘要:

2004年12月,软伽马射线中继站SGR 1806-20发出了有史以来观测到的最强大的巨型耀斑。这可能涉及磁层的大规模重排,导致其X射线发射特性的可观测变化。在这里,我们介绍了SGR 1806-20的第一个朱雀观测结果,以及几乎同时使用XMM-牛顿和INTEGRAL进行的观测。源似乎已经达到了一个状态,其特点是通量接近耀斑前的水平,并由一个相对较软的频谱。尽管如此,SGR 1806-20在巨大耀斑之后仍然非常活跃,使我们能够研究朱雀观测到的1-100 keV范围内的几次短爆发。我们讨论了宽带光谱特性SGR 1806-20,包括持久性和爆发性发射,在磁星模型的背景下,并考虑其最近的理论发展。

英文摘要:

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 remained quite active also 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.

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