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Title:
The external origin of the gas in S0 galaxies
Authors:
Bertola, F.; Buson, L. M.; Zeilinger, W. W.
Affiliation:
AA(Padua Univ., Italy), AB(Osservatorio Astronomico, Padua, Italy), AC(ESO, Garching bei München, Germany)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 401, no. 2, p. L79-L81. (ApJL Homepage)
Publication Date:
12/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
INTERACTING GALAXIES, INTERSTELLAR GAS, SPIRAL GALAXIES, ASTRONOMICAL SPECTROSCOPY, IONIZED GASES
DOI:
10.1086/186675
Bibliographic Code:
1992ApJ...401L..79B

Abstract

We present three new cases of S0 galaxies, namely NGC 2768, NGC 4379, and IC 4889, out of a sample of 15, in which the gas is counterrotating or strongly kinematically decoupled with respect to the stellar body of the galaxy. Assuming gas infall with randomly oriented angular momentum, this result implies that in 40 percent of the galaxies in our sample, the ionized gas is of external origin. However, several pieces of evidence suggest that the acquisition of external gas in S0 galaxies can be even more general.

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