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arXiv 1402.4137astro-ph.GAastro-ph.CO
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流体动力学模拟中Ia型超新星的祖先和化学富集-I。单一退化情景

Progenitors of Supernovae Type Ia and Chemical Enrichment in Hydrodynamical Simulations -I. The Single Degenerate Scenario

Noelia Jimenez, Patricia B. Tissera, Francesca Matteucci

摘要:

Ia型超新星(SNIa)祖先的性质仍然不确定。这是星系演化模型的一个主要问题,因为化学和能量反馈在气体动力学、恒星形成以及整个恒星演化中都起着重要作用。在文献中可用的SNIa的祖先模型提出了不同的分布来调节这些事件的爆发时间。这些函数被称为延迟时间分布(DTD)。这项工作是第一个在一系列的文件,旨在研究五个不同的DTD SNIA。在这里,我们实现和分析的单一退化的情况下(SD)在星系中占主导地位的快速淬火的恒星形成,显示大部分的恒星集中在凸起组件。我们发现一个很好的适合目前观察到的SNIa率在球状为主的星系,和[O/Fe]比所示的银河系的凸起。此外,SD的情况下,发现重现特定SNIa率和特定的恒星形成率之间的相关性,这非常类似的观测趋势,与以前的作品。我们的研究结果表明,在具有非常低和非常高的特定恒星形成率的星系中,SNIa观测可以帮助对DTD施加更严格的约束,从而对SNIa祖先施加更严格的约束。

英文摘要:

The nature of the Type Ia supernovae (SNIa) progenitors remains still uncertain. This is a major issue for galaxy evolution models since both chemical and energetic feedback play a major role in the gas dynamics, star formation and therefore in the overall stellar evolution. The progenitor models for the SNIa available in the literature propose different distributions for regulating the explosion times of these events. These functions are known as the Delay Time Distributions (DTDs). This work is the first one in a series of papers aiming at studying five different DTDs for SNIa. Here, we implement and analyse the Single Degenerate scenario (SD) in galaxies dominated by a rapid quenching of the star formation, displaying the majority of the stars concentrated in the bulge component. We find a good fit to both the present observed SNIa rates in spheroidal dominated galaxies, and to the [O/Fe] ratios shown by the bulge of the Milky Way. Additionally, the SD scenario is found to reproduce a correlation between the specific SNIa rate and the specific star formation rate, which closely resembles the observational trend, at variance with previous works. Our results suggest that SNIa observations in galaxies with very low and very high specific star formation rates can help to impose more stringent constraints on the DTDs and therefore on SNIa progenitors.

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