arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.2020astro-ph.HE
收藏

经典吸积盘的高频谱

On the high frequency spectrum of a classical accretion disc

Steven A. Balbus

备注：
10 pages, 2 figures. To appear in MNRAS Letters
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们导出了经典吸积盘高频频谱的简单而明确的表达式。无应力和有限应力的内边界被认为是。一个经典的吸积盘光谱与无应力的内边界偏离维恩谱在大$ν$，缩放为$ν^{2.5}$（而不是$ν^3$）倍通常的指数截止。如果在内部盘边界处存在有限的应力，则最大盘温度通常发生在该边缘处，即使在相对适度的应力值下也是如此。在这种情况下，高频谱与$ν^2$乘以指数截止值成比例。如果温度最大值是局部热点，而不是轴对称环，则内部最大值产生$ν^2$前因子，而边缘最大值产生$ν^{1.5}$。由于光束效应，后一种发现应该属于经典的相对论圆盘。的渐近一般是强大的和独立的详细的温度分布，只要释放的自由能的差分旋转耗散局部，并可能被证明是有用的超越严格的域的经典光盘理论。随着观测结果的不断改善，我们的研究结果表明，使用高能量的光谱成分的黑洞候选人作为经典理论的签名预测，以及在吸积盘的内部区域的应力诊断的可能性。

英文摘要：

We derive simple and explicit expressions for the high frequency spectrum of a classical accretion disc. Both stress-free and finite stress inner boundaries are considered. A classical accretion disc spectrum with a stress-free inner boundary departs from a Wien spectrum at large $ν$, scaling as $ν^{2.5}$ (as opposed to $ν^3$) times the usual exponential cut-off. If there is finite stress at the inner disc boundary, the maximum disc temperature generally occurs at this edge, even at relatively modest values of the stress. In this case, the high frequency spectrum is proportional to $ν^2$ times the exponential cut-off. If the temperature maximum is a local hot spot, instead of an axisymmetric ring, then an interior maximum produces a $ν^2$ prefactor while an edge maximum yields $ν^{1.5}$. Because of beaming effects, these latter findings should pertain to a classical relativistic disc. The asymptotics are in general robust and independent of the detailed temperature profile, provided only that the liberated free energy of differential rotation is dissipated locally, and may prove useful beyond the strict domain of classical disc theory. As observations continue to improve with time, our findings suggest the possibility of using the high energy spectral component of black hole candidates as a signature prediction of classical theory, as well as an diagnostic of the stress at the inner regions of an accretion disc.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑