arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.2693astro-ph
收藏

相对论喷流中反常边界层的观测效应

Observational Effects of Anomalous Boundary Layers in Relativistic Jets

M. A. Aloy, P. Mimica

摘要:

最近的理论工作指出,射流与周围介质之间的过渡层可能比以前认为的更复杂。在物理上可实现的条件下,边界层中的洛伦兹因子的横向分布可以是非单调的,在流速比射流脊快的地方显示绝对最大值,然后急剧下降。同样,静止质量密度达到绝对最小值(与洛伦兹因子的最大值一致),然后增长,直到达到外部介质值。这种行为与洛伦兹因子的标准单调下降(从射流中心脊处的最大值开始)和静止质量密度的相应增加(从射流核心处达到的最小值开始)形成对比。我们研究了千帕尺度喷流中上述异常剪切层结构的发射特性,旨在显示与传统单调光滑边界层的可观察差异。

英文摘要:

Recent theoretical work has pointed out that the transition layer between a jet an the medium surrounding it may be more complex than previously thought. Under physically realizable conditions, the transverse profile of the Lorentz factor in the boundary layer can be non-monotonic, displaying the absolute maximum where the flow is faster than at the jet spine, followed by an steep fall off. Likewise, the rest-mass density, reaches an absolute minimum (coincident with the maximum in Lorentz factor) and then grows until it reaches the external medium value. Such a behavior is in contrast to the standard monotonic decline of the Lorentz factor (from a maximum value at the jet central spine) and the corresponding increase of the rest-mass density (from the minimum reached at the jet core). We study the emission properties of the aforementioned anomalous shear layer structures in kiloparsec-scale jets aiming to show observable differences with respect to conventional monotonic and smooth boundary layers.

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。

↑