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arXiv 0912.3722astro-ph.HE
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gamma-ray双星的高能辐射模拟

Modeling the high-energy radiation in gamma-ray binaries

B. Cerutti, G. Dubus, G. Henri

摘要:

伽玛射线双星是银河系中的轨道调制伽玛射线源,可以在GeV和TeV能量下探测到。高能辐射可能来自年轻脉冲星注入的高能电子与来自大质量伴星的光子的相互作用。我们提出了一个模型的高能量辐射的产生,其中考虑了发射,吸收和对级联。费米太空望远镜对LS I +61 303的最新观测显示,在几个GeV的能量下,光谱出现指数截止,与伽马-伽马吸收不一致。电子辐射在GeV和TeV可能有两个不同的起源。我们调查是否从未受冲击的脉冲星风的发射解释了在LS I +61 303的GeV分量。

英文摘要:

Gamma-ray binaries are orbital modulated gamma-ray sources in the Galaxy detected both at GeV and TeV energies. The high-energy radiation may come from the interaction of energetic electrons injected by a young pulsar and photons from the massive companion star. We present a model for the production of high-energy radiation where emission, absorption and pair cascading are considered. New observations of LS I +61 303 by the Fermi Space Telescope revealed an exponential cut-off in the spectrum at a few GeV, inconsistent with gamma-gamma absorption. Electrons radiating at GeV and TeV have probably two different origins. We investigate whether the emission from the unshocked pulsar wind explains the GeV component in LS I +61 303.

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