Paper:	Formation of Gaseous Shells
Volume:	197, XVth IAP Meeting Dynamics of Galaxies: From the Early Universe to the Present
Page:	339
Authors:	Combes, F.; Charmandaris, V.
Abstract:	HI observations have revealed in several shell galaxies the presence of gaseous shells slightly displaced from the stellar shells radially, in the outward direction. We propose a mechanism to form this gaseous shells, based on the well-known phase-wrapping process of the companion matter in a merger, with nearly radial orbits. The mechanism relies on the existence of a clumpy interstellar matter, and on dynamical friction experienced by the companion core.

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