论文标题
在边缘星系中，通过其高度来约束IA型超新星
Constraining Type Ia supernovae through their heights in edge-on galaxies
论文作者
论文摘要
在这封信中，使用分类的197个超新星（SNE）ia，我们对它们的高度分布进行了分析，以从螺旋式边缘螺旋中进行光盘分布，并研究其光曲线（LC）下降率$ $（Δm_{15}）$。我们首次证明，SNE IA的91T和91BG样子类对其宿主光盘的平面分布不同。 The average height from the disc and its comparison with scales of thin/thick disc components gives a possibility to roughly estimate the SNe Ia progenitor ages: 91T-like events, being at the smallest heights, originate from relatively younger progenitors with ages of about several 100 Myr, 91bg-like SNe, having the highest distribution, arise from progenitors with significantly older ages $\sim 10$ Gyr, and normal SNe IA分布在另外两个之间的IA中，来自大约一个至$ \ sim 10 $ gyr的祖细胞。我们发现LC下降速率与SN IA高度之间的相关性，这是由椎间盘中恒星种群的垂直年龄梯度和亚chandrasekhar质量白矮爆炸模型的垂直年龄梯度，其中$ΔM_{15} $参数是祖先年龄指标。
In this Letter, using classified 197 supernovae (SNe) Ia, we perform an analyses of their height distributions from the disc in edge-on spirals and investigate their light-curve (LC) decline rates $(Δm_{15})$. We demonstrate, for the first time, that 91T- and 91bg-like subclasses of SNe Ia are distributed differently toward the plane of their host disc. The average height from the disc and its comparison with scales of thin/thick disc components gives a possibility to roughly estimate the SNe Ia progenitor ages: 91T-like events, being at the smallest heights, originate from relatively younger progenitors with ages of about several 100 Myr, 91bg-like SNe, having the highest distribution, arise from progenitors with significantly older ages $\sim 10$ Gyr, and normal SNe Ia, which distributed between those of the two others, are from progenitors of about one up to $\sim 10$ Gyr. We find a correlation between LC decline rates and SN Ia heights, which is explained by the vertical age gradient of stellar population in discs and a sub-Chandrasekhar mass white dwarf explosion models, where the $Δm_{15}$ parameter is a progenitor age indicator.
