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DOI	10.1126/science.1231502
	Evidence for two distinct populations of type Ia supernovae
	Wang X.; Wang L.; Filippenko A.V.; Zhang T.; Zhao X.
发表日期	2013
ISSN	0036-8075
起始页码	170
结束页码	173
卷号	340 期号:6129
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 found 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 do normal-velocity SNe Ia and are restricted to galaxies with substantial chemical evolution.
英文关键词	chemical composition; cosmology; ejecta; extraterrestrial matter; geology; metal; velocity profile; article; astronomy; evolution; measurement; priority journal; surface property; type ia supernovae; velocity
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/245961
作者单位	Department of Physics, Tsinghua University, Beijing 100084, China; Mitchell Institute for Fundamental Physics and Astronomy, Texas a and M University, College Station, TX 77843, United States; Purple Mountain Observatory, Nanjing, 201008 Jiangsu, China; Department of Astronomy, University of California, Berkeley, CA 94720-3411, United States; National Astronomical Observatory of China, Chinese Academy of Sciences, Beijing 100012, China
推荐引用方式 GB/T 7714	Wang X.,Wang L.,Filippenko A.V.,et al. Evidence for two distinct populations of type Ia supernovae[J],2013,340(6129).
APA	Wang X.,Wang L.,Filippenko A.V.,Zhang T.,&Zhao X..(2013).Evidence for two distinct populations of type Ia supernovae.Science,340(6129).
MLA	Wang X.,et al."Evidence for two distinct populations of type Ia supernovae".Science 340.6129(2013).