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Seeking footprints of the primeval Universe in dwarf galaxies

Published online by Cambridge University Press:  05 March 2015

Sebastian L. Hidalgo  and
the LCID group
Sebastian L. Hidalgo
Affiliation:
Instituto de Astrofísica de Canarias. Vía Láctea s/n. E38200 - La Laguna, Tenerife, Canary Islands, Spain email: shidalgo@iac.es Department of Astrophysics, University of La Laguna. Vía Láctea s/n. E38200 - La Laguna, Tenerife, Canary Islands, Spain
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Abstract

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We present the star formation histories (SFHs) of four isolated dwarf galaxies, Cetus, Tucana, LGS-3, and Phoenix, as a function of galactocentric radius. Our results suggest that beyond some distance from the center, there are no significative differences in fundamental properties of these galaxies, such as the star formation rate (SFR) or age-metallicity relation (AMR). The stellar content of this region would be composed of old (≳ 10.5 Gyr) metal-poor stars only. In the innermost regions, dwarf galaxies appear to have formed stars during time intervals which duration varies from galaxy to galaxy. This extended star formation produces the dichotomy between dwarf spheroidal (dSph) and dwarf Transition (dTr) galaxy types.

Keywords

galaxies: dwarfgalaxies: evolutionLocal Group
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 273 - 274
Copyright
Copyright © International Astronomical Union 2015 

References

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