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arXiv 0901.2928astro-ph.HE
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基于BAT瞬发特性筛选高z伽玛暴的可能性研究

Investigating the Possibility of Screening High-z GRBs based on BAT Prompt Emission Properties

T. N. Ukwatta, T. Sakamoto, K. S. Dhuga, W. C. Parke, S. D. Barthelmy, N. Gehrels, M. Stamatikos, J. Tueller

摘要:

如果能够在雨燕卫星观测到的伽马射线暴(GRB)中迅速选出那些高Z值的候选者,地面观测者就有更好的机会确定如此遥远的GRB的红移。关于这些高z伽玛暴的信息对于帮助解决早期宇宙的问题非常重要,例如高z伽玛暴的形成率,宇宙的再电离期,早期宇宙的金属丰度和哈勃膨胀。最初使用的样本51 GRB与以前测量的红移,我们已经制定了高Z筛选标准采用GRB光谱以及时间特性的提示发射从突发警报望远镜(BAT)雨燕。现在样本已经增加到81个伽玛暴,我们重新审视了筛选标准和方法。本文介绍了我们更新的高z筛选标准。

英文摘要:

Being able to quickly select among gamma-ray bursts (GRBs) seen by the Swift satellite those which are high-z candidates would give ground-based observers a better chance to determine a redshift for such distant GRBs. Information about these high-z GRBs is important in helping to resolve questions about the early universe such as the formation rate of high-z GRBs, the re-ionization period of the universe, the metallicity of the early universe, and the Hubble expansion. Initially using a sample of 51 GRBs with previously measured redshifts, we have developed high-z screening criteria employing the GRB spectral as well as temporal characteristics of the prompt emission from the Burst Alert Telescope (BAT) on Swift. Now that the sample has increased to 81 GRBs, we have revisited the screening criteria and our methodology. Our updated high-z screening criteria are presented in this paper.

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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