AI 中文总结
研究银河系PeV伽马射线源周围扩展发射及耀斑回声，考虑天鹅座区域扩展PeV源或由天鹅座X - 3产生，是其过去耀斑回声，通过分析PeV发射与微波光子相互作用等情况来研究。
AI 中文摘要
我们注意到，银河系PeV伽马射线源通常预计会被多度数尺度的扩展发射所包围，这是由于PeV伽马射线与微波光子相互作用，在星际介质中注入电子 - 正电子对而产生的。由于其母源PeV发射功率的变化，这种发射的表面亮度可能随时间变化。母源的一次耀斑会产生一个“回声”，在扩展发射区域传播，可能在数十年到数千年的时间尺度上被探测到。我们考虑天鹅座区域非常扩展的PeV源可能是由天鹅座X - 3 PeV伽马射线源产生的，可能是其过去耀斑的回声。
英文摘要
We notice that Galactic sources of PeV gamma-rays are generally expected to be surrounded by multi-degree-scale extended emission produced as a result of injection of electron-positron pairs in the interstellar medium from interactions of PeV gamma-rays with microwave photons. The surface brightness of such emission may be variable in time because of variability of the PeV emission power of its parent source. A flare of the parent source produces an ``echo'' spreading across the extended emission region that may be detectable on the time scales from decades to millennia. We consider a possibility that the very extended PeV source in the Cygnus region is the produced by the Cygnus X-3 PeV gamma-ray source, possibly being an echo of its past flare.
Comments5 pages, 4 figures
