Paper:	S0 galaxies and the Hubble sequence
Volume:	10, Evolution of the Universe of Galaxies: Edwin Hubble Centennial Symposium
Page:	70
Authors:	van den Bergh, Sidney
Abstract:	It is shown that the S0 class comprises a number of physically quite distinct types of objects. Many luminous S0's are probably truly intermediate between galaxies of types E and Sa, whereas most less-luminous S0's might be rotationally supported disk-like lenticulars. A third class of S0 galaxies, comprising such objects as NGC 5128 and NGC 5195, probably owe their present appearance to recent close tidal encounters or mergers. The results obtained in this paper suggest that S0 galaxies, even though they exhibit superficial similarities, probably arrived at their present morphological state via a variety of quite different evolution tracks.

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