Le 10 février 2017
De 10h30 à 12h00
Stacy McGaugh
Case Western
There exists an empirical scale in galaxy dynamics connecting baryons with kinematics. The mass discrepancy appears at a particular acceleration scale, and grows progressively more severe at lower accelerations. This connection is so orderly that it appears to be a law of nature: velocities in rotating galaxies can be predicted from the observed baryon distribution, even in low surface brightness galaxies that are completely dark matter dominated. This also appears to apply to pressure supported dwarf satellite galaxies, for which the field of the host galaxy also appears to matter.