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arXiv 0904.1064astro-ph.HE
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Gamma-ray二元LS 5039非热X射线调制的长期稳定性

Long-term Stability of Non-thermal X-ray Modulation in the Gamma-ray Binary LS 5039

Tetsuichi Kishishita, Takaaki Tanaka, Yasunobu Uchiyama, Tadayuki Takahashi

摘要:

我们报告的长期稳定性X射线调制明显同步的轨道周期为3.9天的伽马射线双星LS 5039。2007年对朱雀卫星进行的连续观测超过一个轨道周期,为我们提供了X射线通量和光谱形状随轨道相位变化的详细特征。受朱雀实验结果的启发,我们重新分析了1999年至2005年期间ASCA、XMM-牛顿和钱德拉获得的X射线数据,以研究LS 5039在X射线波段的长期行为。我们发现1999- 2007年的调制曲线非常稳定。即使是光变曲线中的细微结构,如尖峰和凹陷,也被发现从一个轨道到另一个轨道非常相似。过去观测到的光谱特征与朱雀号观测到的某些轨道相位段的光谱特征一致。我们认为,磁流体动力学碰撞之间的相对论性流出的紧凑的对象和恒星风O星解释了时钟般的非热X射线发射超过八年,通过显着稳定的生产高能量粒子附近的二元系统。

英文摘要:

We report on long-term stability of X-ray modulation apparently synchronized with an orbital period of 3.9 days in the gamma-ray binary LS 5039. Recent observations with the Suzaku satellite in the year 2007, which covered continuously more than one orbital period, have provided us with detailed characterization of X-ray flux and spectral shape as a function of orbital phase. Motivated by the results from Suzaku, we have re-analyzed the X-ray data obtained with ASCA, XMM-Newton, and Chandra between 1999 and 2005, to investigate long-term behavior of LS 5039 in the X-ray band. We found that the modulation curves in 1999--2007 are surprisingly stable. Even fine structures in the light curves such as spikes and dips are found to be quite similar from one orbit to another. The spectral characteristics observed in the past are consistent with those seen with Suzaku for some orbital phase segments. We suggest that magneto-hydrodynamical collisions between the relativistic outflow from a compact object and the stellar wind from the O star explain the clock-like non-thermal X-ray emission over eight years through remarkably stable production of high-energy particles near the binary system.

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