论文标题
来自银河系和宇宙星形成历史的IA型超新星的延迟时间分布
Delay Time Distributions of Type Ia Supernovae From Galaxy and Cosmic Star Formation Histories
论文作者
论文摘要
我们通过两种独立方法提出了IA型超新星(SN IA)延迟时间分布(DTD)的分析重建:Markov Chain Monte Carlo最佳拟合技术将体积率历史历史与当今的Cosmend Ia cosmic cosmic cosmic Star history的最大范围进行比较,并通过对星体形成率的群体进行分析,从SN IA产生。我们采用灵活的偏斜正常DTD模型,该模型可以与广泛的身体动机DTD形式相匹配。我们找到了一个本质上是指数DTD的解决方案家族,其形状类似于$β\ 1 $ 1 $ power-law Lawl DTD,但比及时事件(<1 gyr)的延迟事件(> 1 GYR)的延迟(> 1 GYR)。将这些解决方案与延迟从场星系和星系簇分别得出的时间度量进行比较时,我们发现偏斜的正常溶液可以同时容纳两者,而无需在不同的环境中需要不同的DTD形式。这些模型拟合通常与单脱位二元种群合成模型的结果不一致,并且对于大多数SN IA事件而言,似乎支持双层祖细胞。
We present analytical reconstructions of type Ia supernova (SN Ia) delay time distributions (DTDs) by way of two independent methods: by a Markov chain Monte Carlo best-fit technique comparing the volumetric SN Ia rate history to today's compendium cosmic star-formation history, and secondly through a maximum likelihood analysis of the star formation rate histories of individual galaxies in the GOODS/CANDELS field, in comparison to their resultant SN Ia yields. We adopt a flexible skew-normal DTD model, which could match a wide range of physically motivated DTD forms. We find a family of solutions that are essentially exponential DTDs, similar in shape to the $β\approx-1$ power-law DTDs, but with more delayed events (>1 Gyr in age) than prompt events (<1 Gyr). Comparing these solutions to delay time measures separately derived from field galaxies and galaxy clusters, we find the skew-normal solutions can accommodate both without requiring a different DTD form in different environments. These model fits are generally inconsistent with results from single-degenerate binary population synthesis models, and are seemingly supportive of double-degenerate progenitors for most SN Ia events.