论文标题
宇宙射线从超新星残留物的时期逃逸可能位于银河系中心非常高的宇宙射线梯度的起源
Time-dependent escape of cosmic rays from supernova remnants potentially at the origin of the very-high-energy cosmic-ray gradient of the Galactic center
论文作者
论文摘要
HE.S.S.表明在银河中心（GC）上存在明显的宇宙射线（CR）梯度峰值。先前的研究表明，这些数据与在GC处脱离固定源的CRS分散的情况是一致的。我们先前表明，考虑到超新星爆炸的3D气体分布和现实的分布，在超新星残留物中加速的CRS（SNR）应考虑H.E.S.S.观察到的GC CRS的很大一部分；但是该模型并未完全重现内部30 PC中明显的过度密度。 在这项工作中，我们研究了时间能量依赖性的宇宙射线从残留物中逃脱，当冲击波在周围介质中减速时会发生。我们表明，由此产生的CR分布遵循H.E.S.S.观察到的准平台轮廓。更紧密。主要的签名是能量依赖性逃逸产生了伽马射线发射的形态与能量的强烈依赖性。 Cherenkov望远镜阵列应观察到这种能量依赖性的存在。
The distribution of the very-high-energy diffuse emission in the inner 200 pc measured by HE.S.S. indicates the existence of a pronounced cosmic-ray (CR) gradient peaking on the Galactic center (GC). Previous studies have shown that these data are consistent with a scenario in which the CRs are diffused away from a stationary source at the GC. We previously showed that, taking the 3D gas distribution and a realistic distribution of supernova explosions into account, CRs accelerated in supernova remnants (SNR) should account for a large fraction of the GC CRs observed by H.E.S.S.; but the model did not fully reproduce the apparent over-density in the inner 30 pc. In this work, we study the time-energy dependent cosmic rays escape from the remnant that is expected to occur when the shock wave decelerates in the surrounding medium. We show that the resulting CR distribution follows the quasi-stationary profile observed by H.E.S.S. more closely. The main signature is that the energy-dependent escape creates a strong dependency of the morphology of the gamma-ray emission with the energy. The existence of this energy dependency should be observable by the Cherenkov Telescope Array.
