红移0.1-1.0的超新星速率--斯德哥尔摩VIMOS超新星巡天IV
The Rate of Supernovae at Redshift 0.1-1.0 - the Stockholm VIMOS Supernova Survey IV
摘要：
我们目前的超新星速率测量红移0.1-1.0从斯德哥尔摩VIMOS超新星调查（SVISS）。该样本总共包含16颗超新星。根据它们的光变曲线、颜色演化和宿主星系光度红移，已将发现的超新星分类为核心坍缩或Ia型超新星（分别为9和7）。我们发现核心坍缩超新星的速率是3.29（-1.78，-1.45）（+3.08，+1.98）x 10^-4年^-1百万秒差距^-3小时70 ^3（分别有统计误差和系统误差）（-3.12，-2.11）（+5.30，+3.65）x 10^-4 yr^-1 Mpc^-3 h70^3，平均红移为0.73。对于Ia型超新星，我们发现在平均红移为0.62时，速率为1.29（-0.57，-0.28）（+0.88，+0.27）x 10^-4 yr^-1 Mpc^-3 h70 ^3。所有这些速率估计值都已被校正为宿主星系的灭绝，使用的方法包括在高红移的红外明亮星系中错过的超新星。我们使用蒙特卡罗模拟进行了深入的研究，系统的影响，从假设时计算率，发现最重要的错误来自错误的分类，假设的混合暗淡和明亮的超新星类型和不确定性的消光校正。我们比较我们的利率与其他观测和预测率的核心崩溃和Ia型超新星的基础上的恒星形成的历史和不同的模型的延迟时间分布。总的来说，我们的测量，当考虑到灭绝的影响，同意相当不错的预测和早期的结果。我们的研究结果强调了理解系统效应的作用的重要性，特别是当试图估计中等到高红移的超新星发生率时，尘埃消光。
英文摘要：
We present supernova rate measurements at redshift 0.1-1.0 from the Stockholm VIMOS Supernova Survey (SVISS). The sample contains 16 supernovae in total. The discovered supernovae have been classified as core collapse or type Ia supernovae (9 and 7, respectively) based on their light curves, colour evolution and host galaxy photometric redshift. The rates we find for the core collapse supernovae are 3.29 (-1.78,-1.45)(+3.08,+1.98) x 10^-4 yr^-1 Mpc^-3 h70^3 (with statistical and systematic errors respectively) at average redshift 0.39 and 6.40 (-3.12,-2.11)(+5.30,+3.65) x 10^-4 yr^-1 Mpc^-3 h70^3 at average redshift 0.73. For the type Ia supernovae we find a rate of 1.29 (-0.57,-0.28)(+0.88,+0.27) x 10^-4 yr^-1 Mpc^-3 h70^3 at average redshift 0.62. All of these rate estimates have been corrected for host galaxy extinction, using a method that includes supernovae missed in infrared bright galaxies at high redshift. We use Monte Carlo simulations to make a thorough study of the systematic effects from assumptions made when calculating the rates and find that the most important errors come from misclassification, the assumed mix of faint and bright supernova types and uncertainties in the extinction correction. We compare our rates to other observations and to the predicted rates for core collapse and type Ia supernovae based on the star formation history and different models of the delay time distribution. Overall, our measurements, when taking the effects of extinction into account, agree quite well with the predictions and earlier results. Our results highlight the importance of understanding the role of systematic effects, and dust extinction in particular, when trying to estimate the rates of supernovae at moderate to high redshift.
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