Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..603b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 3, pp. 603-614.
Astronomy and Astrophysics
Astronomy
25
Galaxies: Abundances, Galaxies: Evolution, Galaxies: Fundamental Parameters, Galaxies: Individual: Eso 146-G14, Galaxies: Stellar Content
Scientific paper
In our search for nearby young and unevolved galaxies we encountered ESO 146-G14, a blue low-surface-brightness late-type disc galaxy with remarkable properties. The analysis of the chemical abundances of the brightest HII regions yields an oxygen abundance of 6+/-1 per cent of the solar value, which is low even in comparison with most metal-poor blue compact dwarf galaxies. We determine a dynamical mass of 7+/-x10^9 M_solar of which ~40 per cent is in HI. Optical/near-IR observations in combination with spectral evolutionary models are used to derive information about the star formation history. Two models give good fits to the data. One has a very low age (~10^8 yr), a steep mass function and a high star formation rate. This solution seems marginally incompatible with the dynamical time-scale. We favour a model that has a Salpeter initial mass function (IMF), an age of 9+/-2 Gyr and a low mean star formation rate. We argue that ESO 146-G14 belongs to a population of unevolved galaxies, many of which are likely to have a surface brightness below the optical detection limit.
Bergvall Nils
Ronnback Jari
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