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The HI surface density in low surface brightness galaxies
J. M. Van Der Hulst, E. D. Skillman, G. D. Bothun, T. R. Smith
Journal:

Symposium - International Astronomical Union / Volume 149 / 1992

Published online by Cambridge University Press:

07 August 2017, p. 499

Print publication:

1992
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The HI surface density of 8 low surface brightness galaxies falls below the critical density for star formation. This may explain why these galaxies appear so unevolved and are generally deficient in molecular gas.