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arXiv 1504.00735astro-ph.HEastro-ph.CO
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伽马射线暴宇宙学

Gamma-ray Burst Cosmology

F. Y. Wang, Z. G. Dai, E. W. Liang

摘要:

伽马射线暴是宇宙中最明亮的电磁爆炸,它在硬X射线波段发射出高达$8.8\times10^{54}$ erg的各向同性等效能量。高亮度使它们能够在宇宙中探索的最大距离内被探测到。伽玛暴作为宇宙深处的明亮灯塔,将是探测高红移宇宙性质的理想工具,包括宇宙膨胀和宇宙暗能量、恒星形成率、再电离期和宇宙金属富集历史等。本文综述了伽玛暴的光度关联及其对宇宙学参数和暗能量的影响。观测表明,长伽玛暴的前身是大质量恒星。因此,长伽玛暴可以作为恒星形成速率的示踪物。我们还回顾了来自伽玛暴的高红移恒星形成率,以及宇宙再电离历史的影响。伽玛暴的余辉一般具有破幂律谱,因此有可能提取星系际介质(IGM)的吸收特征。我们还介绍了高红移伽玛暴探测银河系前金属富集和第一批恒星的能力。

英文摘要:

Gamma-ray bursts (GRBs) are the most luminous electromagnetic explosions in the Universe, which emit up to $8.8\times10^{54}$ erg isotropic equivalent energy in the hard X-ray band. The high luminosity makes them detectable out to the largest distances yet explored in the Universe. GRBs, as bright beacons in the deep Universe, would be the ideal tool to probe the properties of high-redshift universe: including the cosmic expansion and dark energy, star formation rate, the reionization epoch and the metal enrichment history of the Universe. In this article, we review the luminosity correlations of GRBs, and implications for constraining the cosmological parameters and dark energy. Observations show that the progenitors of long GRBs are massive stars. So it is expected that long GRBs are tracers of star formation rate. We also review the high-redshift star formation rate derived from GRBs, and implications for the cosmic reionization history. The afterglows of GRBs generally have broken power-law spectra, so it is possible to extract intergalactic medium (IGM) absorption features. We also present the capability of high-redshift GRBs to probe the pre-galactic metal enrichment and the first stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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