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arXiv 0801.1505astro-ph
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Tully-Fisher零点问题

The Tully-Fisher Zero Point Problem

Aaron A. Dutton, Frank C. van den Bosch, Stéphane Courteau

摘要:

在分层盘星系形成模型中,一个长期存在的问题是Tully-Fisher关系的零点与星系光度函数(LF)的同时匹配。我们说明了这个问题的一个典型的盘星系,并讨论了三个解决方案:低恒星的质量与光比,低初始暗晕浓度,没有晕收缩。我们推测,晕收缩可能是通过组合的质量喷射通过反馈和角动量交换所带来的重子和暗物质之间的动力学摩擦盘形成过程中。

英文摘要:

A long standing problem for hierarchical disk galaxy formation models has been the simultaneous matching of the zero point of the Tully-Fisher relation and the galaxy luminosity function (LF). We illustrate this problem for a typical disk galaxy and discuss three solutions: low stellar mass-to-light ratios, low initial dark halo concentrations, and no halo contraction. We speculate that halo contraction may be reversed through a combination of mass ejection through feedback and angular momentum exchange brought about by dynamical friction between baryons and dark matter during the disk formation process.

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