Star Formation Histories of the Galactic Satellites

Details Star Formation Histories of the Galactic Satellites Star Formation Histories of the Galactic Satellites

1999-10-22

arxiv.org/abs/astro-ph/9910409v2

in The Galactic Halo: from Globular Clusters to Field Stars, 35th Liege conference

Astronomy and Astrophysics

Astrophysics

latex, 2 figures, 5 pages

Scientific paper

Late accretion models for formation of the Galactic halo require that many Galactic satellite galaxies have been cannibalised into the halo field. Comparison of the metallicity and age distribution function of stars in the surviving satellites with the apparently exclusively old stars in the field halo can constrain the importance of any such process. We have developed a new objective technique to determine star formation histories in dSph galaxies. We apply this technique to the surviving Galactic satellites, deducing an approximately uniform distribution of ages for the constituents, quite unlike the halo field stars. Thus, late accretion did not play a substantial part in Galactic halo formation.

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