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arXiv 0809.0236astro-ph
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来自与H-α发射相关的对核心坍缩超新星祖先的约束

Constraints on core-collapse supernova progenitors from correlations with H-alpha emission

J. P. Anderson, P. A. James

摘要:

我们目前的观测约束不同的核心坍缩超新星类型的性质,通过调查其爆炸地点与最近的恒星形成的关联,跟踪H-α +[NII]线发射。我们讨论了168个核心坍缩超新星的位置相对于其宿主星系内的H-α发射的分析数据的结果。从我们的分析中,我们发现,总的来说,II型祖先人口并没有跟踪潜在的恒星形成。我们的研究结果是一致的SNII产生的祖星小于10个太阳质量的显着部分。我们发现,Ib型超新星显示出更高程度的关联HII地区比II型(没有准确跟踪的排放),而Ic型人口准确跟踪的H-α排放。这意味着主要的核心坍缩超新星类型形成了一个祖先质量不断增加的序列,从II型到Ib型,最后是Ic型。我们发现,IIn型子类显示出类似程度的关联线发射的整体SNII人口,这意味着至少大多数这些SNe不产生于最大质量的恒星。我们还发现,在我们的样本中的SN '冒名顶替者'的少数不跟踪他们的宿主星系的恒星形成,如果这些事件产生于大规模的蓝色发光变星的祖先,这是不可能的结果。

英文摘要:

We present observational constraints on the nature of the different core-collapse supernova types through an investigation of the association of their explosion sites with recent star formation, as traced by H-alpha +[NII] line emission. We discuss results on the analysed data of the positions of 168 core-collapse supernovae with respect to the H-alpha emission within their host galaxies. From our analysis we find that overall the type II progenitor population does not trace the underlying star formation. Our results are consistent with a significant fraction of SNII arising from progenitor stars of less than 10 solar masses. We find that the supernovae of type Ib show a higher degree of association with HII regions than those of type II (without accurately tracing the emission), while the type Ic population accurately traces the H-alpha emission. This implies that the main core-collapse supernova types form a sequence of increasing progenitor mass, from the type II, to Ib and finally Ic. We find that the type IIn sub-class display a similar degree of association with the line emission to the overall SNII population, implying that at least the majority of these SNe do not arise from the most massive stars. We also find that the small number of SN `impostors' within our sample do not trace the star formation of their host galaxies, a result that would not be expected if these events arise from massive Luminous Blue Variable star progenitors.

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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