SPECTROSCOPIC DIFFERENCES BETWEEN SUPERNOVAE OF TYPE-IA IN EARLY-TYPE AND IN LATE-TYPE GALAXIES

被引：88

作者：

BRANCH, D ^{[1
]}

VANDENBERGH, S ^{[1
]}

机构：

[1] NATL RES COUNCIL CANADA,DOMINION ASTROPHYS OBSERV,VICTORIA V8X 4M6,BC,CANADA

来源：

ASTRONOMICAL JOURNAL | 1993年 / 105卷 / 06期

关键词：

D O I：

10.1086/116601

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Published data are used to derive a uniform set of blueshifts in the lambda6355 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, SO, 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.

引用

页码：2231 / 2235

页数：5

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