Compton scattering in a converging fluid flow – II. Radiation-dominated shock
Compton scattering in a converging fluid flow – II. Radiation-dominated shock
复制标题
会聚流体流中的康普顿散射 - II。
DOI：
10.1093/mnras/194.4.1041
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发表时间：
1981
影响因子：
4.8
通讯作者：
D. G. Payne
中科院分区：
文献类型：
--
作者：
R. Blandford;D. G. Payne
概括。光学厚流体流中的康普顿散射问题，其中整体运动是光子加热的主要来源，通过分析速度为 u 的辐射主导、平面平行激波来说明，其中光子与电子之比大大超过 ~ (mp/me)- 在穿过激波（厚度 ~ (c/u) 汤姆逊光学深度）时，典型的光子经历 (c/u ) 2 次散射，每次散射都会产生长期分数能量增加 ~ (ujc) 2 且总平均增加阶次统一。在会聚的流体流中，指数级的少量光子被加速到指数级的大能量。因此，幂律频谱将以高频传输。对于马赫数 M 的冲击，体加速度产生谱指数 a= (M 2 - ½) (M 2 + 6) (M 2 - 1)- 2，对于强冲击，该指数趋于一致。简要讨论了这些结果对类星体和微波背景的适用性。
Summary. The problem of Compton scattering in an optically thick fluid flow in which bulk motion is the dominant source of photon heating is illus trated by analysing a radiation-dominated, plane-parallel shock of speed u with photon to electron ratio greatly exceeding ~ (mp/me)- In traversing the shock (of thickness ~ (c/u) Thomson optical depths), a typical photon experiences (c/u ) 2 scatterings, each one giving a secular fractional energy increase ~ (ujc) 2 and a total average increase of order unity. In a converging fluid flow, an exponentially small number of photons are accelerated to an exponentially large energy. Thus, a power-law spectrum will be transmitted at high frequencies. For a shock of Mach number M, bulk acceleration pro duces a spectral index a= (M 2 - ½) (M 2 + 6) (M 2 - 1)- 2, which tends to unity for a strong shock. The applicability of these results to quasars and the micro wave background is briefly discussed.