论文标题
在复发性novae的壳中加速颗粒多长时间？
For how long are particles accelerated in shells of recurrent Novae ?
论文作者
论文摘要
银河novae目前是伽玛射线来源良好的类别。我们想知道电子加速度在Novae壳中运行的机理多长时间。为了在电子加速度的时间尺度上放大约束，我们考虑了一个特定模型，用于注射和传播电子在复发的Nova RS Ophiuchi中。我们计算了Nova壳内电子的平衡光谱以及这些电子在Nova二元系统内的红色巨头的软辐射中产生的伽马射线通量以及Nova Photosphere的辐射。我们研究了两个组件，相关的模型，其中球形弹出的Nova壳在Nova二元系统的极性区域自由传播。但是，在二进制系统的密集赤道区域中，壳会显着减速。我们讨论电子可以产生伽马射线的条件，这些伽马射线可能可通过当前和/或将来的伽马射线观测值检测到。可以得出结论，在最佳情况下（强磁性壳和10％的电子加速度的效率）在Cherenkov望远镜阵列的灵敏度内仅在爆炸后的1 - 2年内，可以在1-2年的敏感性中产生TEV Gamma-Rays。另一方面，在RS Ophiuchi的整个复发期，即〜15年。
Galactic Novae is at present well established class of gamma-ray sources. We wonder for how long the mechanism of acceleration of electrons operates in shells of Novae. In order to put constraints on the time scale of the electron acceleration, we consider a specific model for the injection and propagation of electrons within the shell of the recurrent Nova RS Ophiuchi. We calculate the equilibrium spectra of electrons within the Nova shell and the gamma-ray fluxes produced by these electrons in the comptonization of the soft radiation from the Red Giant within the Nova binary system and also radiation from the Nova photosphere. We investigate two component, time dependent model in which a spherically ejected Nova shell propagates freely in the polar region of the Nova binary system. But, the shell is significantly decelerated in the dense equatorial region of the binary system. We discuss the conditions for which electrons can produce gamma-rays which might be detectable by the present and/or future gamma-ray observatories. It is concluded that freely expending shells of Novae in the optimal case (strongly magnetised shell and efficiency of acceleration of electrons of the order of 10%) can produce TeV gamma-rays within the sensitivity of the Cherenkov Telescpe Array only within 1-2 years after explosion. On the other hand, decelerated shells of Novae have a chance to be detected during the whole recurrence period of RS Ophiuchi, i.e. ~15 years.
