CO deficiency in LSB galaxies. Clues to their star-formation history

James M. Schombert, Gregory D. Bothun, Christopher D Impey, Lee G. Mundy

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Abstract

An optical Hα, CO, and H I survey of six low surface-brightness galaxies from the Schombert and Bothun catalog is presented. These galaxies are all late-type, low H I mass disk systems with unusually low-luminosity densities. Overall, the sample exhibits several paradoxical properties such as no detectable CO emission (a mean upper limit of script M signH2/script M signHI.<0.10) despite normal H I surface density, very blue colors without evidence of strong star formation, weak H I regions lacking in massive stars and high script M sign/L's. These properties suggest two possible star-formation histories for this class of objects centering on (1) inefficient star formation in a very metal-poor environment and (2) star formation which occurs preferentially outside of the giant molecular cloud environment with an IMF operating in a suppressed high mass mode.

Original languageEnglish (US)
Pages (from-to)1523-1531
Number of pages9
JournalAstronomical Journal
Volume100
Issue number5
Publication statusPublished - Nov 1990

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ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Schombert, J. M., Bothun, G. D., Impey, C. D., & Mundy, L. G. (1990). CO deficiency in LSB galaxies. Clues to their star-formation history. Astronomical Journal, 100(5), 1523-1531.