The external origin of the gas in S0 galaxies

Details The external origin of the gas in S0 galaxies The external origin of the gas in S0 galaxies

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401l..79b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 401, no. 2, p. L79-L81.

Astronomy and Astrophysics

Astrophysics

104

Interacting Galaxies, Interstellar Gas, Spiral Galaxies, Astronomical Spectroscopy, Ionized Gases

Scientific paper

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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