Research Papers in Physics and Astronomy

 

Date of this Version

1976

Comments

Published in The Astrophysical Journal 204. Copyright (c) 1976 The American Astronomical Society. Used by permission.

Abstract

Implications of observed upper limits to the neutral hydrogen content of E and SO galaxies from Paper I are discussed. If gas shed by dying stars is completely retained by these galaxies and exists as H I, these upper limits will be exceeded in only 109 yr for E's and SO's and in only 2 x 108 yr for NGC 4472. Evidently, gas either is hidden in some undetectable form or is removed from the interstellar medium completely.

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