Implications of the dwarfs spheroidal galaxy mass-metallicity relation

Details Implications of the dwarfs spheroidal galaxy mass-metallicity relation Implications of the dwarfs spheroidal galaxy mass-metallicity relation

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97.1058s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Nov. 1985, p. 1058-1064.

Astronomy and Astrophysics

Astronomy

13

Chemical Evolution, Dwarf Galaxies, Galactic Evolution, Metallicity, Stellar Mass, Abundance, Astronomical Models, Elliptical Galaxies, Spheroids, Supernovae

Scientific paper

The properties of the mass-metallicity relation among dwarf spheroidal galaxies are discussed in terms of a model which assumes that the internal chemical evolution of the dwarf spheroidals was promoted by supernova activity. The model can be used to explain the observed dwarf spheroidal mass-metallicity relation assuming the present mass of these systems Ms is proportional to their initial masses M as Ms varies according to a power-law index of exp 7/4. It is inferred from the power-law dependence of M on the proto-cloud radius that the most massive dwarf spheroids were formed from the densest clouds. The observed slope of the mass-metallicity relation for dwarf spheroidal galaxies is found to be significantly different from theoretical estimates of this slope for elliptical galaxies. It is suggested that the difference may imply that spheroidal dwarfs and elliptical galaxies had different formation histories, confirming Kormendy's (1985) observations of differences in the brightness and luminosity trends.

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