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arXiv 1909.05445astro-ph.GAastro-ph.CO
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Ia型超新星UV通量与宿主星系金属丰度关系的光度分析

A Photometric Analysis of the Relationship Between Type Ia Supernova UV Flux and Host Galaxy Metallicity

Peter J. Brown, Nicole R. Crumpler

摘要:

Ia型超新星(SNe Ia)的母星金属丰度的影响具有重要的宇宙学意义,因为需要在大的宇宙时间跨度内比较这些可测量的蜡烛,其中母星可能具有不同的性质。关于金属丰度差异影响的波长范围,理论模型得出了不同的结论,导致对紫外线观测样本的不同解释。最近的工作声称,从雨燕棱镜光谱测量的超新星Ia的中紫外线通量与其宿主星系的气相金属丰度之间存在相关性。在这里,我们检查紫外光度相同的对象。我们没有发现显着的相关性之间的紫外光学颜色(或紫外/光学计数率比)的超新星Ia和宿主星系的质量或金属丰度的属性。缺乏一个显着的相关性与宿主星系金属丰度意味着另一个物理差异以外的祖先金属丰度占主导地位的紫外线通量的差异。我们不再受到缺乏紫外线观测的限制。相反,理解现有的观测结果需要改进的理论模型和更大的物理差异参数空间。

英文摘要:

The effect of progenitor metallicity on Type Ia Supernovae (SNe Ia) has important cosmological implications due to the need for these standardizable candles to be compared across large spans of cosmic time in which the progenitor stars might have different properties. Theoretical models have come to different conclusions as to the wavelength range impacted by metallicity differences, leading to differing interpretations of the growing sample of UV observations. Recent work has claimed a correlation between the mid-UV flux of SNe Ia measured from Swift grism spectra and the gas-phase metallicities measured for their host galaxies. Here we examine UV photometry for the same objects. We find no significant correlations between the UV-optical colors (or UV/optical count rate ratios) of the SNe Ia and the host galaxy properties of mass or metallicity. The lack of a significant correlation with host galaxy metallicity implies another physical difference other than progenitor metallicity dominates the UV flux differences. We are no longer limited by a lack of UV observations. Rather, understanding the existing observations requires improved theoretical models and a larger parameter space of physical differences.

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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