Stabilizing a Cold Disk with a 1/r Force Law [chapter]

Joel E. Tohline
1983 Internal Kinematics and Dynamics of Galaxies  
Massive "dark" halos are currently believed to surround individual galaxies and systems of galaxies primarily because: (a) individual galaxies exhibit "flat" rather than Keplerian rotation curves (see the review by Faber and Gallagher 1979); (b) the measured ratio of mass to light in systems of galaxies continues to increase roughly linearly with radius as one observes larger and larger systems (Rood 1982); and (c) rapidly spinning "cold" stellar disks are not dynamically stable if they are
more » ... ble if they are fully self-gravitating (Ostriker and Peebles 1973). It can be shown, however, that properties (a) and (b) of galaxies and systems of galaxies can be explained without invoking dark halos if one assumes that the force of gravity has the form 205 E. Athanassoula (ed.), Internal Kinematics and Dynamics of Galaxies,[205][206]
doi:10.1007/978-94-009-7075-5_56 fatcat:5zlnu6otyjgjbjqydtbf2ci2lq