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引用次数: 0
摘要
神奇速度是解释 SS 433 稳定喷流速度的可行机制之一,它由辐射压力和辐射阻力(以及重力)之间的平衡决定。我们研究了几种典型情况(如平面平行和球面情况)下光厚亚相对论流的神奇速度,结果表明,与光薄流相比较,在简单的光厚流中很难建立神奇速度。相反,我们提出了漏斗喷流作为改进模型。也就是说,我们考虑的是由超临界吸积盘形成的漏斗中的光学厚流,质量和辐射能量从漏斗壁注入。在这个模型中,质量增殖速度决定了漏斗的构造、喷流质量损失率的增加和辐射环境,然后亚相对论魔速就自然而然地建立起来了。
Magic speed under radiation drag for the optically thick outflows and SS 433 jets
One of the promising mechanisms to explain the stable jet speed of SS 433 is the magic speed, which is established by the balance between radiation pressure and radiation drag (and gravity). We examine the magic speed in the optically thick sub-relativistic flows for several typical situations, such as plane-parallel and spherical cases, and show that it is difficult to establish the magic speed in the simple optically thick flows in contrast to the optically thin ones. Instead, we propose the funnel jets as an improved model. That is, we consider the optically thick flows in the funnel, which is formed by the supercritical accretion disk, and mass and radiation energy are injected from the funnel wall. In this model the mass-accretion rate determines the configuration of the funnel, the increasing mass-loss rate of jets, the radiative environments, and then the sub-relativistic magic speed is naturally established.
期刊介绍:
Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.