2000A&A...357..397V -
Astronomy and Astrophysics, volume 357, 397-413 (2000/5-2)
The evolution of the stellar populations in low surface brightness galaxies.
VAN DEN HOEK L.B., DE BLOK W.J.G., VAN DER HULST J.M. and DE JONG T.
Abstract (from CDS):
We investigate the star formation history and chemical evolution of low surface brightness (LSB) disk galaxies by modelling their observed spectro-photometric and chemical properties using a galactic chemical and photometric evolution model incorporating a detailed metallicity dependent set of stellar input data. For a large fraction of the LSB galaxies in our sample, observed properties are best explained by models incorporating an exponentially decreasing global star formation rate (SFR) ending at a present-day gas fraction Mgas/(Mgas+Mstars)=0.5 for a galaxy age of 14Gyr. For some galaxies small amplitude star formation bursts are required to explain the contribution of the young (5-50Myr old) stellar population to the galaxy integrated luminosity. This suggests that star formation has proceeded in a stochastic manner. The presence of an old stellar population in many late-type LSB galaxies suggests that LSB galaxies roughly follow the same evolutionary history as HSB galaxies, except at a much lower rate. In particular, our results imply that LSB galaxies do not form late, nor have a delayed onset of star formation, but simply evolve slowly.
Abstract Copyright:
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Journal keyword(s):
galaxies: evolution - galaxies: fundamental parameters - galaxies: formation - galaxies: spiral
Simbad objects:
17
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