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Galaxies follow tight scaling relations linking their dynamical properties to their baryonic content. The study of these dynamical laws strongly constrains cosmological models of galaxy formation. I will present new results on the baryonic Tully-Fisher relation (BTFR), which links the total baryonic mass of a galaxy to its outer rotation velocity. I will discuss both successes and failures of LCDM models that attempt to reproduce the BTFR using gas outflows from stellar feedback. In particular, I will show that starburst dwarf galaxies in the nearby Universe provide no evidence for massive gas outflows. Finally, I will present new dynamical scaling laws that link the baryonic mass distribution of a galaxy to the detailed shape of its rotation curve: these relations can be thought of as local inner-galaxy counterparts of the BTFR. |
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