Cosmic gamma-ray background from type Ia supernovae reexamined:: Evidence for missing gamma rays at MeV energy -: art. no. 121301

被引：35

作者：

Ahn, K ^{[1
]}

Komatsu, E ^{[1
]}

Höflich, P ^{[1
]}

机构：

[1] Univ Texas, Dept Astron, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW D | 2005年 / 71卷 / 12期

关键词：

D O I：

10.1103/PhysRevD.71.121301

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The observed cosmic gamma-ray background at similar to MeV has often been attributed to Type Ia supernovae (SNIa). Since SNIa is close to a standard candle, one can calculate the gamma-ray intensity of SNIa integrated over redshifts fairly accurately, once the evolution of the SNIa rate is known. The latest SNIa rate measured at z less than or similar to 1.6 [Dahlen et al., Astrophys. J. 613, 189 ( 2004)] indicates that the previous calculations of the gamma-ray background consistently overestimated the SNIa rate. With the new rate, we find that the SNIa contribution is an order of magnitude smaller than observed, and thus new population(s) of sources should be invoked.

引用

页数：4

共 37 条

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