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arXiv 0808.0591astro-ph
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z>6时长伽马射线暴的光度函数及其速率

The Luminosity Function of Long Gamma-Ray Bursts and their rate at z>6

R. Salvaterra, S. Campana, G. Chincarini, T. R. Choudhury, S. Covino, A. Ferrara, S. Gallerani, C. Guidorzi, G. Tagliaferri

摘要:

我们计算了三种不同情况下长伽马射线暴(GRB)的光度函数(LF)和形成率:i)GRB跟随宇宙星形成,LF随时间恒定; ii)GRB跟随宇宙星形成,但LF随红移变化; iii)GRB优先在低金属丰度环境中形成。然后,我们根据Swift 3年的数据测试了模型预测,结果表明情况i)被强烈排除。此外,我们表明,明亮的伽玛暴的雨燕检测到的数量表明,伽玛暴应该经历了某种红移的光度演化,在过去更明亮。最后,我们提出了利用z>5.5的伽玛暴余辉谱的观测结果来约束再电离历史,并将我们的方法应用于伽玛暴050904的情况。

英文摘要:

We compute the luminosity function (LF) and the formation rate of long gamma ray bursts (GRBs) in three different scenarios: i) GRBs follow the cosmic star formation and their LF is constant in time; ii) GRBs follow the cosmic star formation but the LF varies with redshift; iii) GRBs form preferentially in low-metallicity environments. We then test model predictions against the Swift 3-year data, showing that scenario i) is robustly ruled out. Moreover, we show that the number of bright GRBs detected by Swift suggests that GRBs should have experienced some sort of luminosity evolution with redshift, being more luminous in the past. Finally we propose to use the observations of the afterglow spectrum of GRBs at z>5.5 to constrain the reionization history and we applied our method to the case of GRB 050904.

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