Jacobus Van Loon j.t.van.loon@keele.ac.uk
The stellar populations in the low-luminosity, early-type galaxy NGC 59
Van Loon
Authors
Abstract
Low-luminosity galaxies may be the building blocks of more luminous systems. Southern African Large Telescope observations of the low-luminosity, early-type galaxy NGC 59 are obtained and analysed. These data are used to measure the stellar population parameters in the centre and off-centre regions of this galaxy, in order to uncover its likely star formation history. We find evidence of older stars, in addition to young stars in the emission-line regions. The metallicity of the stellar population is constrained to be [Z/H] ~ -1.1 to -1.6, which is extremely low, even for this low-luminosity galaxy, since it is not classed as a dwarf spheroidal galaxy. The measured [a/Fe] ratio is subsolar, which indicates an extended star formation history in NGC 59. If such objects formed the building blocks of more massive, early-type galaxies, then they must have been gaseous mergers, rather than dry mergers, in order to increase the metals to observed levels in luminous, early-type galaxies.
Citation
Van Loon. (2015). The stellar populations in the low-luminosity, early-type galaxy NGC 59. Monthly Notices of the Royal Astronomical Society, 1338 - 1348. https://doi.org/10.1093/mnras/stv690
Acceptance Date | Apr 24, 2015 |
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Publication Date | Apr 24, 2015 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Publisher | Oxford University Press |
Pages | 1338 - 1348 |
DOI | https://doi.org/10.1093/mnras/stv690 |
Keywords | galaxies, abundances, elliptical and lenticular cD, individual, NGC 59, stellar content |
Publisher URL | http://mnras.oxfordjournals.org/content/450/2/1338 |
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