Spectroscopic differences between supernovae of type Ia in early-type and in late-type galaxies
Spectroscopic differences between supernovae of type Ia in early-type and in late-type galaxies
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DOI：
10.1086/116601
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发表时间：
1993-06
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影响因子：
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通讯作者：
D. Branch;S. Bergh
中科院分区：
文献类型：
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作者：
D. Branch;S. Bergh
已发布的数据用于在SI II的λ6355特征中得出一组均匀的蓝光，用于IA型的33个超新星（SNE IA）。类型（e，s0，sa）星系。蓝调对父级的依赖性表明，蓝调蓝调是由于全局的物理差异而不是由于其扩张中的不对称性而引起的据推测，膨胀速度低的SNE IA可能比具有较高膨胀速度的祖细胞较老
Published data are used to derive a uniform set of blueshifts in the λ6355 feature of Si II for 33 supernovae of type Ia (SNe Ia). All seven SNe Ia with blueshifts at ten days past maximum < 9500 km s −1 occurred in early-type (E, S0, Sa) galaxies. The observed dependence of Si II blueshift on parent-galaxy type indicates that differing SNe Ia blueshifts are due to global physical differences, rather than to asymmetries in their expansion that are viewed from different directions. It is speculated that SNe Ia with low expansion velocities might, in the mean, have older progenitors than those with high expansion velocities