Formation of Gaseous Shells

Details Formation of Gaseous Shells Formation of Gaseous Shells

1999-08-16

arxiv.org/abs/astro-ph/9908162v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, in "Galaxy Dynamics: from the Early Universe to the Present", ASP Conf Series, ed. F. Combes, G. Mamon, V.

Scientific paper

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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