The evolution of the stellar populations in low surface brightness galaxies

LB van den Hoek, WJG de Blok*, JM van der Hulst, T de Jong

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

63 Citations (Scopus)

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 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 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 nl 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.

Original languageEnglish
Pages (from-to)397-413
Number of pages17
JournalAstronomy & astrophysics
Volume357
Issue number2
Publication statusPublished - May-2000

Keywords

  • galaxies : evolution
  • galaxies : fundamental parameters
  • galaxies : formation
  • galaxies : spiral
  • STAR FORMATION RATES
  • H-II-REGIONS
  • SPIRAL GALAXIES
  • INTERSTELLAR-MEDIUM
  • IRREGULAR GALAXIES
  • MAGELLANIC CLOUDS
  • GALACTIC DISKS
  • VIRGO CLUSTER
  • ABUNDANCES
  • PHOTOMETRY

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