Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-19
Mon.Not.Roy.Astron.Soc.317:831,2000
Astronomy and Astrophysics
Astrophysics
14 pages including 7 figures. Accepted to MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03809.x
We use recent HST colour-magnitude diagrams of the resolved stellar populations of a sample of local dSph galaxies (Carina, LeoI, LeoII, Ursa Minor and Draco) to infer the star formation histories of these systems, $SFR(t)$. Applying a new variational calculus maximum likelihood method which includes a full Bayesian analysis and allows a non-parametric estimate of the function one is solving for, we infer the star formation histories of the systems studied. This method has the advantage of yielding an objective answer, as one need not assume {\it a priori} the form of the function one is trying to recover. The results are checked independently using Saha's $W$ statistic. The total luminosities of the systems are used to normalize the results into physical units and derive SN type II rates. We derive the luminosity weighted mean star formation history of this sample of galaxies.
Gilmore Gerard
Hernandez Xabier
Valls-Gabaud David
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