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26 April 2024 |
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The evolution of the stellar populations in low surface brightness galaxies | | L.B. van den Hoek
; W.J.G. de Blok
; J.M. van der Hulst
; T. de Jong .
; | | Date: |
15 Mar 2000 | | Subject: | astro-ph | | Affiliation: | 1,4). ( Astronomical Institute ’Anton Pannekoek’ Amsterdam, Netherlands Australia Telescope National Facility, Sydney, Australia Kapteyn Astronomical Institute Groningen, The Netherlands Space Research Organisation of the Netherlands Utr | | Abstract: | 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 depen dent 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 (M_{gas}/(M_{gas}+M_{stars}) = 0.5 for a galaxy age of 14 Gyr. For some galaxies small amplitude star formation bursts are required to explain the contribution of the young (5-50 Myr 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. | | Source: | arXiv, astro-ph/0003224 | | Services: | Forum | Review | PDF | Favorites | |
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