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A photometric redshift of z = 6.39 +/- 0.12 for GRB 050904.

机译：对于GRB 050904，z = 6.39 +/- 0.12的光度红移。

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摘要

Gamma-ray bursts (GRBs) and their afterglows are the most brilliant transient events in the Universe. Both the bursts themselves and their afterglows have been predicted to be visible out to redshifts of z approximately 20, and therefore to be powerful probes of the early Universe. The burst GRB 000131, at z = 4.50, was hitherto the most distant such event identified. Here we report the discovery of the bright near-infrared afterglow of GRB 050904 (ref. 4). From our measurements of the near-infrared afterglow, and our failure to detect the optical afterglow, we determine the photometric redshift of the burst to be z = 6.39 - 0.12 + 0.11 (refs 5-7). Subsequently, it was measured spectroscopically to be z = 6.29 +/- 0.01, in agreement with our photometric estimate. These results demonstrate that GRBs can be used to trace the star formation, metallicity, and reionization histories of the early Universe.
机译：伽玛射线爆发（GRB）及其余辉是宇宙中最辉煌的瞬变事件。据预测，爆发本身及其余辉都可以看到z的红移约20，因此是早期宇宙的有力探测。突发GRB 000131（z = 4.50）是迄今为止最远的此类事件。在这里，我们报告了GRB 050904（参考文献4）明亮的近红外余辉的发现。根据我们对近红外余辉的测量以及我们未能检测到光学余辉，我们确定该突发的光度红移为z = 6.39-0.12 + 0.11（参考文献5-7）。随后，与我们的光度估算结果一致，经分光光度法测量为z = 6.29 +/- 0.01。这些结果表明，GRB可用于追踪早期宇宙的恒星形成，金属性和电离历史。

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