标题： 从高红移处的Ia型/II型超新星速率中我们可以学到什么？ 显示英文标题

标题： What can we learn from Type Ia/II Supernovae rates at high-z ?

摘要： 我们展示如何利用不同红移处的Ia/II型超新星速率来追踪宇宙恒星形成率（CSFR）的历史。 利用最近的宇宙恒星形成率（CSFR）估计，我们计算了预测的宇宙Ia/II型超新星速率。 我们表明，虽然SNII速率能直接测量瞬时的CSFR，但SNIa速率取决于CSFR的过去历史。 这为我们提供了一种新的独立诊断恒星形成率的方法。 与数据的比较在本地和高-$z$测量中都表现出良好的一致性，并提供了CSFR在至$z = 1$的有效性额外证据，但在$z > 1$处表明更高的值，这与消光效应的存在一致。 对SNIa速率至$z {\s im}$ 1 的测量对于理解早期时期$z > 1$的恒星形成历史至关重要。 我们还表明，目前对Ia型超新星速率的观测已经为我们提供了关于其前身天体性质的有价值信息。 显示英文摘要

摘要： 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.