Measuring cosmology with Gamma-Ray Bursts

被引：0

作者：

Dai, ZG ^{[1
]}

Xu, D ^{[1
]}

Liang, EW ^{[1
]}

机构：

[1] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China

来源：

NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA C-COLLOQUIA ON PHYSICS | 2005年 / 28卷 / 4-5期

关键词：

D O I：

10.1393/ncc/i2005-10122-5

中图分类号：

学科分类号：

摘要：

Gamma-Ray Bursts (GRBs) are becoming more and more standardizable candles. Different methods have been proposed to measure cosmology with the relation between the gamma-ray energy E-gamma of a GRB jet and the peak energy E-p of the nu F-nu spectrum in the burst frame. We compare the procedures and results of these methods. Using the present sample of 17 GRBs, we obtain a constraint on the mass density Omega(M)=0.22(-0.07)(+0.42) (1 sigma) for a flat Lambda CDM universe with the median circumburst density n similar or equal to 3.0 cm(-3). Theoretical investigations of the E-gamma proportional to E-p(alpha) relation reach a similar to 1.5. A larger sample in the Swift era is expected to provide further constraints on the GRB cosmography.

引用

页码：657 / 660

页数：4

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