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arXiv 1202.1450astro-ph.GAastro-ph.COastro-ph.IM
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旋转双峰和非运动双峰

Rotating Disks and Non-Kinematic Double Peaks

Moshe Elitzur, Andres Asensio Ramos, Cecilia Ceccarelli

摘要:

双峰线轮廓通常被认为是旋转盘的标志,峰值之间的距离是旋转速度的量度。然而,在光学厚的非旋转源中的辐射转移效应也可以引起双峰。利用线传输问题的精确解,我们提出了一个详细的研究线发射的几何薄开普勒磁盘。我们推导出光学薄和厚磁盘中出现运动学双峰的条件,并发现在观察到的双峰轮廓中,运动学和线不透明度的影响通常是不可能解开的。除非有额外的信息补充,双峰轮廓本身并不是旋转圆盘的可靠指标。在某些情况下,三重和四重轮廓可能是光学厚盘中旋转的更好指示器。

英文摘要:

Double-peaked line profiles are commonly considered a hallmark of rotating disks, with the distance between the peaks a measure of the rotation velocity. However, double-peaks can arise also from radiative transfer effects in optically thick non-rotating sources. Utilizing exact solutions of the line transfer problem we present a detailed study of line emission from geometrically thin Keplerian disks. We derive the conditions for emergence of kinematic double peaks in optically thin and thick disks, and find that it is generally impossible to disentangle the effects of kinematics and line opacity in observed double-peaked profiles. Unless supplemented by additional information, a double-peaked profile alone is not a reliable indicator of a rotating disk. In certain circumstances, triple and quadruple profiles might be better indicators of rotation in optically thick disks.

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。

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