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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Relativistic radiative transfer in a moving stratus irradiated by a luminous flat source
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Relativistic radiative transfer in a moving stratus irradiated by a luminous flat source

机译：发光平面光源在运动的地层中的相对论辐射转移

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摘要

Relativistic radiative transfer in a geometrically thin stratus (sheet-like gaseous cloud with finite optical depth), which is moving at a relativistic speed around a luminous flat source, such as accretion disks, and is irradiated by the source, is examined under the special relativistic treatment. Incident radiation is aberrated and Doppler-shifted when it is received by the stratus, and emitted radiation is also aberrated and Doppler-shifted when it leaves the stratus. Considering these relativistic effects, we analytically obtain the emergent intensity as well as other radiative quantities in the purely scattering case for both infinite and finite strati. We mainly consider the frequency-integrated case, but also briefly show the frequency-dependent one. We also solve the relativistic radiative transfer equation numerically, and compare the results with the analytical solutions. In the infinite stratus, the mean intensity in the comoving and inertial frames decreases and becomes constant, as the stratus speed increases. The flux in the comoving frame decreases exponentially with the optical depth. The emergent intensity decreases as the speed increases, since the incident photons are redshifted at the bottom-side of the stratus. In the finite stratus, the mean intensity in the comoving and inertial frames quickly increases in the top-side region due to the aberrated photons. The flux in the comoving frame is positive in the range of 0 < beta <= 0.4, while it becomes negative for beta greater than or similar to 0.5. The behavior of the emergent intensity is similar to that of the infinite case, although there is an irradiation effect caused by the aberrated photons.
机译：在特殊条件下研究了几何薄层（具有有限光学深度的片状气态云）中的相对论辐射传递，该层以相对论的速度围绕发光平板光源（如吸积盘）移动并受到该光源的辐射。相对论治疗。入射辐射在被层吸收时会发生畸变并发生多普勒频移，而发射出的辐射在离开层时也会发生畸变并发生多普勒频移。考虑到这些相对论效应，我们分析了在无限层和有限层的纯散射情况下的出射强度以及其他辐射量。我们主要考虑频率积分的情况，但也简要介绍频率相关的情况。我们还用数值方法求解了相对论的辐射传递方程，并将结果与​​解析解进行了比较。在无限层中，随着层速度的增加，共同运动框架和惯性框架中的平均强度减小并变得恒定。共同移动框架中的光通量随光学深度呈指数下降。由于入射光子在层的底侧发生红移，因此出射强度随速度增加而降低。在有限层中，由于光子的像差，共同运动和惯性系中的平均强度在顶侧区域迅速增加。共同运动框架中的通量在0

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