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arXiv 0704.0877astro-ph
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Ia型超新星的双峰性

The bimodality of type Ia Supernovae

F. Mannucci, N. Panagia, M. Della Valle

摘要:

我们评论的存在下的双峰分布的延迟时间之间的形成的祖细胞和他们的爆炸Ia型SNe。文献中有两种双峰性:一种是“弱”双峰性,即Ia型超新星必须从年轻和年老的祖先中爆发;另一种是“强”双峰性,即大约一半的系统在形成后的10^8年内爆发。“弱”双峰性是基于观测上观测到的辐射率与宿主星系SFR的依赖关系,而“强”双峰性则是基于射电强和射电静的早型星系的不同辐射率。我们回顾这些双模态的证据。最后,我们估计SNe的分数错过了光学和近红外搜索,因为在大规模的星爆尘埃消光。

英文摘要:

We comment on the presence of a bimodality in the distribution of delay time between the formation of the progenitors and their explosion as type Ia SNe. Two "flavors" of such bimodality are present in the literature: a "weak" bimodality, in which type Ia SNe must explode from both young and old progenitors, and a "strong" bimodality, in which about half of the systems explode within 10^8 years from formation. The "weak" bimodality is observationally based on the dependence of the rates with the host galaxy SFR, while the "strong" one on the different rates in radio-loud and radio-quiet early-type galaxies. We review the evidence for these bimodalities. Finally, we estimate the fraction of SNe which are missed by optical and near-IR searches because of dust extinction in massive starbursts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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