The Tully-Fisher Zero Point Problem

Details The Tully-Fisher Zero Point Problem The Tully-Fisher Zero Point Problem

2008-01-09

arxiv.org/abs/0801.1505v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to appear in proceedings of "Formation and Evolution of Galaxy Disks", Rome, October 2007, Eds. J.G. Funes,

Scientific paper

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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