Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-11-13
Astronomy and Astrophysics
Astrophysics
5 pages LaTeX; 2 embedded figures; MNRAS Letters, Accepted
Scientific paper
10.1046/j.1365-8711.1999.02282.x
Near-infrared (NIR) K' images of a sample of five low surface brightness disc galaxies (LSBGs) were combined with optical data, with the aim of constraining their star formation histories. Both red and blue LSBGs were imaged to enable comparison of their stellar populations. For both types of galaxy strong colour gradients were found, consistent with mean stellar age gradients. Very low stellar metallicities were ruled out on the basis of metallicity-sensitive optical-NIR colours. These five galaxies suggest that red and blue LSBGs have very different star formation histories and represent two independent routes to low B band surface brightness. Blue LSBGs are well described by models with low, roughly constant star formation rates, whereas red LSBGs are better described by a `faded disc' scenario.
Bell Eric F.
Bower Richard G.
de Jong Roelof S.
Hereld Mark
Rauscher Bernard J.
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