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Paper: Thin discs and dense bulges - What do they tell us about galaxies?
Volume: 10, Evolution of the Universe of Galaxies: Edwin Hubble Centennial Symposium
Page: 25
Authors: Ostriker, Jeremiah P.
Abstract: Two basic facts about galaxies, the high density of the bulges and the thinness of the disks, are analyzed dynamically with the following conclusions: (1) the mass added in stellar lumps after the formation of the major part of the disks is less than 3 percent of the Galactic mass, and (2) spiral bulges are not made from mergers of bulgeless spirals, i.e., not made out of disk material.
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