The influence of the environment on the rate of type Ia supernovae in radio galaxies

被引：0

作者：

Della Valle, M ^{[1
]}

Panagia, N ^{[1
]}

Padovani, P ^{[1
]}

Cappellaro, E ^{[1
]}

Mannucci, F ^{[1
]}

Turatto, M ^{[1
]}

机构：

[1] INAF Arcetri, Florence, Italy

来源：

1604-2004: Supernovae as Cosmological Lighthouses | 2005年 / 342卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An analysis of Type Ia Supernova (SNIa) events in early type galaxies from the Cappellaro, Evans & Turatto (1999) database provides conclusive evidence that the rate of type Ia Supernovae (SNe) in radio-loud galaxies is about 4 times higher than the rate measured in radio-quiet galaxies, i.e. SNIa-rate(radio - loud galaxies) = 0.43(-0.14)(+0.19)h(75)(2) SNu as compared to SNIa-rate(radio quiet galaxies) = 0.11(-0.03)(+0.06)h(75)(2) SNu. The actual value of the enhancement is likely to be in the range similar to 2 - 7 (P similar to 10(-4)). We analyse the possible causes of this result and conclude that the enhancement of SNIa explosion rate in radio-loud galaxies has the same origin as their being strong radio sources, but there is no causality link between the two phenomena. We argue that repeated episodes of interaction and/or mergers of early type galaxies with dwarf companions, on times-scale of about 1 Gyr, are responsible for inducing both strong radio activity observed in similar to 14% of early type galaxies and to supply an adequate number of SNIa progenitors to the stellar population of ellipticals.

引用

页码：133 / 139

页数：7

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