Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..393..571s&link_type=abstract
The seventh astrophysical conference: Star formation, near and far. AIP Conference Proceedings, Volume 393, pp. 571-581 (1997).
Astronomy and Astrophysics
Astrophysics
9
Dwarf Galaxies, Origin, Formation, Evolution, Age, And Star Formation, Galactic Halos, Stellar Content And Populations, Radii, Morphology And Overall Structure
Scientific paper
The nine dwarf spheroidal galaxies (dSphs) that are companions of the Galaxy provide excellent laboratories for exploring the physical processes that regulate star formation and galaxy evolution. Although the dSphs are currently devoid of gas, recent investigations of their stellar populations have shown that their star formation histories are surprisingly complex. The Carina dSph is a prime example; it actively formed stars in four distinct episodes over the last 1 to 14 Gyr. Carina retained an interstellar medium over numerous generations of supernovae explosions, which proves that star formation can be self-regulated even in these very low mass galaxies. Explaining the observed star-formation rates and chemical-enrichment histories of the dSphs will be challenging, but in doing so we will gain insight into the balance between star formation and the negative feedback from massive stars, and how galactic winds and massive dark matter halos shape the evolution of galaxies.
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