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arXiv 1206.2643astro-ph.HEastro-ph.CO
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Ibc型超新星宿主星系的光谱研究

A Spectroscopic Study of Type Ibc Supernova Host Galaxies from Untargeted Surveys

Nathan E. Sanders, Alicia M. Soderberg, Emily M. Levesque, Ryan J. Foley, Ryan Chornock, Dan Milisavljevic, Raffaella Margutti, Edo Berger, Maria R. Drout, Ian … 展开作者

Nathan E. Sanders, Alicia M. Soderberg, Emily M. Levesque, Ryan J. Foley, Ryan Chornock, Dan Milisavljevic, Raffaella Margutti, Edo Berger, Maria R. Drout, Ian Czekala, Jason A. Dittmann

摘要:

我们提出了最大的光谱研究的主机环境的Ibc型超新星(SN Ibc)发现专门的非目标SN搜索。过去对SN Ibc宿主环境的研究一直偏向于高质量、高金属丰度的星系,主要集中在以星系为目标的SN搜索中发现的SNe。我们的新观测结果是非目标SN Ibc宿主环境的光谱恒星星族年龄和金属丰度测量结果总数的两倍多,并扩展到中值红移约为以前统计研究的两倍(z = 0.04)。对于我们的金属丰度样本中的12个SNe Ib和21个SNe Ic,我们发现金属丰度的中位数分别为log(O/H)+12 = 8.48和8.61,但确定金属丰度的完整分布的差异在统计学上不显著。这个中间值的差异只对应于金属线驱动风造成的质量损失的一个小差异(<30%),这表明这在区分SN Ib和Ic祖先时并不起主导作用。然而,在我们的样本中,7个宽线SN Ic(SN Ic-BL)的金属丰度中位数明显较低,log(O/H)+12 = 8.34。SN Ic-BL宿主环境的年轻恒星星族的年龄似乎也低于SN Ib和Ic,但我们的年龄样本很小。迄今为止,SN Ibc宿主环境光谱的合成并未揭示SN Ib和Ic金属丰度的显著差异,但强化了SN Ic-BL较低金属丰度的重要性。这个组合的样本表明,以星系为目标的SN搜索引入了一个显着的偏见,研究试图推断SN祖先的金属丰度分布,我们确定和讨论其他系统的影响,发挥较小的作用。我们讨论了LSST时代SN Ibc祖细胞研究取得进展的前进道路。

英文摘要:

We present the largest spectroscopic study of the host environments of Type Ibc supernovae (SN Ibc) discovered exclusively by untargeted SN searches. Past studies of SN Ibc host environments have been biased towards high-mass, high-metallicity galaxies by focusing on SNe discovered in galaxy-targeted SN searches. Our new observations more than double the total number of spectroscopic stellar population age and metallicity measurements published for untargeted SN Ibc host environments, and extend to a median redshift about twice as large as previous statistical studies (z = 0.04). For the 12 SNe Ib and 21 SNe Ic in our metallicity sample, we find median metallicities of log(O/H)+12 = 8.48 and 8.61, respectively, but determine that the discrepancy in the full distribution of metallicities is not statistically significant. This median difference would correspond to only a small difference in the mass loss via metal-line driven winds (<30%), suggesting this does not play the dominant role in distinguishing SN Ib and Ic progenitors. However, the median metallicity of the 7 broad-lined SN Ic (SN Ic-BL) in our sample is significantly lower, log(O/H)+12 = 8.34. The age of the young stellar population of SN Ic-BL host environments also seems to be lower than for SN Ib and Ic, but our age sample is small. A synthesis of SN Ibc host environment spectroscopy to date does not reveal a significant difference in SN Ib and Ic metallicities, but reinforces the significance of the lower metallicities for SN Ic-BL. This combined sample demonstrates that galaxy-targeted SN searches introduce a significant bias for studies seeking to infer the metallicity distribution of SN progenitors, and we identify and discuss other systematic effects that play smaller roles. We discuss the path forward for making progress on SN Ibc progenitor studies in the LSST era.

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