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首页> 外文期刊>The Astrophysical journal >EDDINGTON LIMIT AND RADIATIVE TRANSFER IN HIGHLY INHOMOGENEOUS ATMOSPHERES
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EDDINGTON LIMIT AND RADIATIVE TRANSFER IN HIGHLY INHOMOGENEOUS ATMOSPHERES

机译：非均质大气中的爱丁顿极限和辐射转移

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摘要

Radiation-dominated accretion disks are likely to be subject to the " photon bubble " instability, which may lead to strong density inhomogeneities on scales much shorter than the disk scale height. Such disks, and magnetized, radiation-dominated atmospheres in general, could radiate well above the Eddington limit without being disrupted. When density contrasts become large over distances of the order of the photon mean free path, radiative transfer cannot be described adequately using either the standard diffusion approximation or existing prescriptions for flux-limited diffusion. Using analytical and Monte Carlo techniques, we consider the effects of strong density gradients deep within radiation- and scattering-dominated atmospheres. We find that radiation viscosity, i.e., the off-diagonal elements of the radiation stress tensor, has an important effect on radiative transfer under such conditions. We compare analytical and numerical results in the specific case of a plane-parallel density-wave structure and calculate Eddington enhancement factors due to "the porosity of the atmosphere. Our results can be applied to the study of dynamical coupling between radiation forces and density inhomogeneities in radiation-dominated accretion disks in two or three dimensions.
机译：辐射为主的吸积盘可能会受到“光子气泡”不稳定性的影响，这可能导致比磁盘标尺高度短得多的标尺上出现强烈的密度不均匀性。这样的磁盘，以及通常被磁化，辐射为主的大气层，在不受到干扰的情况下，可能会辐射出高于爱丁顿极限的辐射。当密度对比在光子平均自由程量级的距离上变大时，无法使用标准扩散近似或通量受限扩散的现有处方充分描述辐射传递。使用分析和蒙特卡洛技术，我们考虑了在辐射和散射为主的大气层深处的强密度梯度的影响。我们发现辐射粘度，即辐射应力张量的非对角线元素，在这种条件下对辐射传递具有重要影响。我们比较了平面平行密度波结构在特定情况下的分析结果和数值结果，并计算了由于“大气孔隙度”引起的爱丁顿增强因子。我们的结果可用于研究辐射力与密度不均匀性之间的动力耦合在二维或三个维度上以辐射为主的吸积盘中。

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