超新星速率来自SUDARE VST-Omegacam搜索。I
Supernova rates from the SUDARE VST-Omegacam search. I
摘要：
我们描述的观测策略，数据处理工具和超新星（SN）搜索项目的早期结果，命名为SUDARE，进行与欧洲南方天文台VST望远镜，旨在测量不同类型的SNe的红移范围0.2<z<0.8的速率。搜索是在两个最好的研究河外领域，CDFS和COSMOS，其中丰富的辅助数据可在文献或公共档案。最终获得了117个SNe样品，其中大部分是SNIa（57%），其余的堆芯坍塌事件中有44%是II型，22%是IIn型，34%是Ib/c型。为了将这些瞬变联系起来，我们建立了一个红移范围为0<z<1、极限星等K_AB=23.5等的~ 1.3 × 10^5星系的星表。这些值与文献中的其他测量值一致。超新星Ia的速率测量的分散度与单（SD）和双简并（DD）二元系统模型的理论轨道的分散度相当，因此数据不允许在两种不同的祖先场景中解开。然而，我们可能会注意到，在三个测试的模型中，SD和两种DD，无论是陡峭的（DDC）还是宽的（DDW）延迟时间分布，SD在整个红移范围内给出了更好的拟合，而DDC更好地匹配红移~1.2的陡峭上升。DDW似乎不太受欢迎。与最近的说法不同，核心坍缩SN速率与基于最近对恒星形成历史和标准祖星质量范围的估计的预测完全一致。
英文摘要：
We describe the observing strategy, data reduction tools and early results of a supernova (SN) search project, named SUDARE, conducted with the ESO VST telescope aimed at measuring the rate of the different types of SNe in the redshift range 0.2<z<0.8. The search was performed in two of the best-studied extragalactic fields, CDFS and COSMOS, for which a wealth of ancillary data are available in the literature or public archives. (abridged) We obtained a final sample of 117 SNe, most of which are SNIa (57%) and the remaining core collapse events of which 44% type II, 22% type IIn and 34% type Ib/c. In order to link the transients, we built a catalog of ~1.3x10^5 galaxies in the redshift range 0<z<1 with a limiting magnitude K_AB=23.5 mag. We measured the SN rate per unit volume for SN Ia and core collapse SNe in different bin of redshifts. The values are consistent with other measurements from the literature. The dispersion of the rate measurements for SNe Ia is comparable with the scatter of the theoretical tracks for single (SD) and double degenerate (DD) binary systems models, therefore the data do not allow to disentangle among the two different progenitor scenarios. However, we may notice that among the three tested models, SD and two flavours of DD, either with a steep (DDC) or a wide (DDW) delay time distribution, the SD gives a better fit across the whole redshift range whereas the DDC better matches the steep rise up to redshift ~1.2. The DDW appears instead less favoured. The core collapse SN rate is fully consistent, unlike recent claims, with the prediction based on recent estimates of the star formation history, and standard progenitor mass range.
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