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arXiv 1010.3259astro-ph.HE
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1 ES 1959+650的同步辐射和逆康普顿谱之间的跃迁

Probing the Transition Between the Synchrotron and Inverse-compton Spectral Components of 1ES 1959+650

E. Bottacini, M. Böttcher, P. Schady, A. Rau, X. -L. Zhang, M. Ajello, C. Fendt, J. Greiner

摘要:

1 ES 1959+650是最显著的高峰值BL Lacertae天体之一。在2002年,它展示了TeV的伽马射线耀斑,但在较低能量下的同步加速器组件没有类似的增亮。我们提出了一个多频运动的结果,触发的整数IBIS检测1 ES 1959+650。我们的数据范围从光学到硬X射线能量,从而同时覆盖同步加速器和逆康普顿组件。我们用INTEGRAL、Swift X射线望远镜和紫外光学望远镜观察了这个源,几乎同时用地面光学望远镜观察了这个源。在X射线能量的陡峭的光谱分量是最有可能由于同步辐射,而在软伽马射线能量的硬光谱指数可以解释为开始的耀变体光谱能量分布(SED)的高能量分量。这是第一次清晰地测量到HBL的凹面X射线-软伽马射线光谱。用轻子同步辐射自康普顿模型可以很好地模拟SED。当SED被拟合时,该模型需要q ~ 1.85的非常硬的电子谱指数,这可能表明二阶费米加速的相关性。

英文摘要:

1ES 1959+650 is one of the most remarkable high-peaked BL Lacertae objects (HBL). In 2002, it exhibited a TeV gamma-ray flare without a similar brightening of the synchrotron component at lower energies. We present the results of a multifrequency campaign, triggered by the INTEGRAL IBIS detection of 1ES 1959+650. Our data range from the optical to hard X-ray energies, thus covering the synchrotron and inverse-Compton components simultaneously. We observed the source with INTEGRAL, the Swift X-Ray Telescope, and the UV-Optical Telescope, and nearly simultaneously with a ground-based optical telescope. The steep spectral component at X-ray energies is most likely due to synchrotron emission, while at soft gamma-ray energies the hard spectral index may be interpreted as the onset of the high-energy component of the blazar spectral energy distribution (SED). This is the first clear measurement of a concave X-ray-soft gamma-ray spectrum for an HBL. The SED can be well modeled with a leptonic synchrotron self-Compton model. When the SED is fitted this model requires a very hard electron spectral index of q ~ 1.85, possibly indicating the relevance of second-order Fermi acceleration.

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