人马座A* 中的扩散Cosmic-ray加速度
Diffusive Cosmic-ray Acceleration in Sagittarius A*
摘要：
费米-LAT和HESS一起揭示了一个不寻常的GeV-TeV源的存在，与银河系中心的Sgr A* 重合。它的高能发射似乎是双峰的，暗示着一个比单纯的冲击加速更复杂的能量过程。有人认为，这可能是强烈的，快速变化的证据，如果Sgr A* 的发射负责在附近的分子云中检测到的荧光X射线回波。然而，在这封{ \it Letter}中，我们证明了在围绕中心黑洞的更现实的两相环境中的随机加速可以很好地适应Sgr A* 的高能谱。因此，我们认为，费米-HESS数据本身并不一定提供证据，在Sgr A* 强的变化。
英文摘要：
Together, the Fermi-LAT and HESS have revealed the presence of an unusual GeV-TeV source coincident with Sgr A* at the Galactic center. Its high-energy emission appears to be bimodal, hinting at an energizing process more sophisticated than mere shock acceleration. It has been suggested that this may be evidence of strong, rapid variability, as required if Sgr A*'s emission were responsible for the fluorescent X-ray echos detected in nearby molecular clouds. In this {\it Letter}, however, we show that stochastic acceleration in a more realistic two-phase environment surrounding the central black hole can accommodate Sgr A*'s high-energy spectrum quite well. We therefore suggest that the Fermi-HESS data alone do not necessarily provide evidence for strong variability in Sgr A*.
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