标题： 伽马射线暴中的辐射转移 显示英文标题

标题： Radiation Transfer in Gamma-Ray Bursts

摘要： 我们计算了高能密度区域（如伽马射线暴源区）中的伽马射线辐射输运，使用的是离散坐标和离散能群方法。 计算包括双光子对产生和湮灭，以及三光子对湮灭。 辐射场本身充当吸收介质，且光学深度取决于其强度，因此该问题本质上是非线性的。 球形发散导致通量的有效准直。 在高光学深度时，外逸谱的高能（$E > 1$ 兆电子伏特）部分呈现出几乎普遍的形式。 推导出了来自特定大小伽马射线暴源区的高能通量的近似极限，并简要讨论了这一极限对1979年3月5日事件距离的影响。 我们更广泛地讨论了非常明亮的爆发问题以及银河晕距离对耀斑模型的影响。 显示英文摘要

摘要： We have calculated gamma-ray radiative transport in regions of high energy density, such as gamma-ray burst source regions, using a discrete ordinate, discrete energy group method. The calculations include two-photon pair production and annihilation, as well as three-photon pair annihilation. The radiation field itself acts as an absorbing medium, and the optical depth depends on its intensity, so the problem is intrinsically nonlinear. Spherical divergence produces effective collimation of the flux. At high optical depth the high energy ($E > 1$ MeV) portion of the emergent spectrum assumes a nearly universal form. An approximate limit is derived for the high energy flux from a gamma-ray burst source region of given size, and the implications of this limit for the distance to the March 5, 1979 event are briefly discussed. We discuss more generally the problem of very luminous bursts, and implications of Galactic halo distances for flare models.