Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1523s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Nov. 1990, p. 1523-1531. Research supported by the National Geographic Society,
Astronomy and Astrophysics
Astronomy
84
Astronomical Models, Brightness Distribution, Carbon Monoxide, Galaxies, Star Formation Rate, Astronomical Catalogs, H Alpha Line, H I Regions, Luminosity
Scientific paper
An optical H-alpha, 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 despite normal H I surface density, very blue colors without evidence of strong star formation, weak H II regions lacking in massive stars, and high M/L. 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.
Bothun Gregory D.
Impey Chris David
Mundy Lee G.
Schombert James M.
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