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arXiv 1706.01017astro-ph.GA
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SPARC重子Tully-Fisher关系的散射、剩余关联和曲率

The scatter, residual correlations and curvature of the SPARC baryonic Tully-Fisher relation

Harry Desmond

摘要:

在最近的工作中,Lelli et al.(2016)认为,LCDM星系样本的重子Tully-Fisher关系(BTFR)的紧密性,以及其残差与有效半径的相关性的弱点,对LCDM宇宙学提出了挑战。在这封信中,我们计算的统计意义,这些结果的框架中的晕丰度匹配,这强加了一个典型的星系晕连接。考虑到样本方差之间的类SPARC实现的父晕人口,我们发现在预测的BTFR的分散是3.6西格玛太高,但其残差与星系大小的相关性是自然弱。此外,我们发现丰度匹配产生BTFR曲率在3.0西格玛不同意的数据,和一小部分的星系与非平坦的旋转曲线略大于观察。

英文摘要:

In recent work, Lelli et al. (2016) argue that the tightness of the baryonic Tully-Fisher relation (BTFR) of the SPARC galaxy sample, and the weakness of the correlation of its residuals with effective radius, pose challenges to LCDM cosmology. In this Letter we calculate the statistical significance of these results in the framework of halo abundance matching, which imposes a canonical galaxy-halo connection. Taking full account of sample variance among SPARC-like realisations of the parent halo population, we find the scatter in the predicted BTFR to be 3.6 sigma too high, but the correlation of its residuals with galaxy size to be naturally weak. Further, we find abundance matching to generate BTFR curvature in 3.0 sigma disagreement with the data, and a fraction of galaxies with non-flat rotation curves somewhat larger than observed.

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