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arXiv 1303.2601astro-ph.COastro-ph.HE
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Ia型超新星的两个不同种群的证据

Evidence for Two Distinct Populations of Type Ia Supernovae

Xiaofeng Wang, Lifan Wang, Alexei V. Filippenko, Tianmeng Zhang, Xulin Zhao

摘要:

Ia型超新星(SNe Ia)已被用作测量宇宙膨胀的优秀可测量蜡烛,但它们的祖先仍然难以捉摸。在这里,我们报告说,光谱多样性的超新星Ia是与他们的出生地环境。我们发现,那些高速喷出物是实质上更集中在内部和更明亮的区域,其宿主星系比正常速度的超新星Ia。此外,前者倾向于居住在更大和更明亮的宿主中。这些结果表明,高速超新星Ia可能起源于相对年轻和更富含金属的祖先比正常速度超新星Ia,并仅限于星系与大量的化学演化。

英文摘要:

Type Ia supernovae (SNe Ia) have been used as excellent standardizable candles for measuring cosmic expansion, but their progenitors are still elusive. Here we report that the spectral diversity of SNe Ia is tied to their birthplace environments. We find that those with high-velocity ejecta are substantially more concentrated in the inner and brighter regions of their host galaxies than are normal-velocity SNe Ia. Furthermore, the former tend to inhabit larger and more-luminous hosts. These results suggest that high-velocity SNe Ia likely originate from relatively younger and more metal-rich progenitors than normal-velocity SNe Ia, and are restricted to galaxies with substantial chemical evolution.

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