Photon Damping of Waves in Accretion Disks
Photon Damping of Waves in Accretion Disks
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吸积盘中波的光子阻尼
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. Krolik
中科院分区：
文献类型：
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作者：
E. Agol;J. Krolik
人们通常认为MHD湍流在吸积盘中有两个重要功能：它向外传输角动量，并且其最短波长模式的能量被消散为吸积盘辐射的热量。在本文中，我们研究了一对机制，可能发挥重要作用，在调节这种动荡的振幅和频谱：光子扩散和粘度。我们表明，在辐射压力占主导地位的磁盘，压缩MHD波的光子阻尼是如此之快，它可能主导所有其他耗散机制。
MHD turbulence is generally believed to have two important functions in accretion disks: it transports angular momentum outward, and the energy in its shortest wavelength modes is dissipated into the heat that the disks radiate. In this paper we examine a pair of mechanisms that may play an important role in regulating the amplitude and spectrum of this turbulence: photon diffusion and viscosity. We demonstrate that in radiation pressure-dominated disks, photon damping of compressive MHD waves is so rapid that it likely dominates all other dissipation mechanisms.