Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-09-23
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, To appear in the Proceedings of the Xth Conference of Blois, "The Birth of Galaxies", held at Blois, Franc
Scientific paper
We show how Type Ia/II supernova rates at various redshifts can be used to follow the cosmic star formation rate (CSFR) history. Using the recent e stimate of the Cosmic Star Formation (CSFR), we compute the predicted cosmic Type Ia/II supernovae rates. We show that while SNII rates provide a direct measurement of the instantaneous CSFR, the SNIa rate depends on the past history of the CSFR. This provides us with a new and independent diagnostic of the star formation rate. The comparison with the data are in good agreement with both local and high-$z$ measurement and provides an additional evid ence of the validity of the CSFR up to $z = 1$, but suggests higer values at $z > 1$ co nsistent with the presence of extinction effects. Measurement of SNIa rate up to $z {\s im}$ 1 will be crucial for our understanding of the star formation history at early epo chs $z > 1$. We also show that current observations on Type Ia supernovae rate already give us valubale information on the nature of their progenitors.
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