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arXiv 0908.0654astro-ph.GA
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一个改进的Tully-Fisher关系和星系盘的一个新标度律

A refined Tully-Fisher relationship and a new scaling law for galaxy discs

D F Roscoe

摘要:

我们展示了如何假设,星系盘符合自相似动力学导致一个客观的识别,在数据中,光盘的环形区域,这是这样的,对应于经典的塔利-费舍尔标度律定义的外部环形边界上,有一个类似的标度律定义的内部环形边界上。该结果在几个大型ORC样品的统计确定性水平上得到证实。此外,同样的分析提供了与定义Vmax的最佳方法相关的不确定性,Vmax是Tully-Fisher标度律所用的旋转速度,Rmax是测量Vmax时的星系半径。最后,作为一个直接的后果,我们导致了一个精致的塔利-费舍尔定律,这在很大程度上是不敏感的手段,其中一个星系的旋转速度的定义。

英文摘要:

We show how the hypothesis that galaxy discs conform to self-similar dynamics leads to an objective identification, in the data, of an annular region of the optical disc which is such that, corresponding to the classical Tully-Fisher scaling law defined on the exterior annular boundary, there is a similar scaling law defined on the interior annular boundary. This result is confirmed at the level of statistical certainty over several large ORC samples. Furthermore, the same analysis provides insight into the uncertainties associated with the best way of defining Vmax, the rotation velocity used for the Tully-Fisher scaling law and Rmax, the galaxy radius at which Vmax is measured. Finally, as a direct consequence, we are led to a refined Tully-Fisher law which is largely insensitive to the means by which a galaxy's rotation velocity is defined.

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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