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arXiv 1104.0300astro-ph.CO
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南半球的五颗超新星巡天星系。II。超新星爆发率

Five supernova survey galaxies in the southern hemisphere. II. The supernova rates

A. A. Hakobyan, A. R. Petrosian, G. A. Mamon, B. McLean, D. Kunth, M. Turatto, E. Cappellaro, F. Mannucci, R. J. Allen, N. Panagia, M. Della Valle

摘要:

本文利用在南半球3838个星系中发现的56个超新星事件,计算了不同类型超新星在哈勃序列上的发生率,并将其归一化到星系的光学和近红外光度以及恒星质量。我们发现,所有SN类型的速率显示依赖于星系的形态和颜色,因此,对恒星形成活动。核心坍缩速率(CC)SNe被证实与恒星形成速率(SFR)密切相关,而与星系的总质量只有间接的关系。Ia超新星的速率可以通过假设旋涡星系中至少15%的Ia事件起源于相对年轻的恒星星族来解释。我们发现,该速率没有显示出与核活动或环境的调制。Ib/c型和II型的SN率比值与螺旋型无趋势性变化。

英文摘要:

Based on the database compiled in the first article of this series, with 56 SN events discovered in 3838 galaxies of the southern hemisphere, we compute the rate of supernovae (SNe) of different types along the Hubble sequence normalized to the optical and near-infrared luminosities as well as to the stellar mass of the galaxies. We find that the rates of all SN types show a dependence on both morphology and colors of the galaxies, and therefore, on the star-formation activity. The rate of core-collapse (CC) SNe is confirmed to be closely related to the Star Formation Rate (SFR) and only indirectly to the total mass of the galaxies. The rate of SNe Ia can be explained by assuming that at least 15% of Ia events in spiral galaxies originates in relatively young stellar populations. We find that the rates show no modulation with nuclear activity or environment. The ratio of SN rates between types Ib/c and II shows no trend with spiral type.

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