An optical spectrum of the afterglow of a gamma-ray burst at a redshift of z = 6.295.-猫眼课题宝

DOI：

发表时间：

2006

期刊：

Nature

影响因子：

64.8

通讯作者：

中科院分区：

综合性期刊1区

文献类型：

作者：

N. Kawai;G. Kosugi;K. Aoki;T. Yamada;T. Totani;K. Ohta;M. Iye;T. Hattori;W. Aoki;H. Furusawa;K. Hurley;K. Kawabata;N. Kobayashi;Y. Komiyama;Y. Mizumoto;K. Nomoto;J. Noumaru;R. Ogasawara;R. Sato;K. Sekiguchi;Y. Shirasaki;M. Suzuki;T. Takata;T. Tamagawa;H. Terada;J. Watanabe;Y. Yatsu;A. Yoshida

伽玛射线暴（GRBs）的快速伽玛射线发射应该可以探测到z bbbb10的距离（参考文献1），因此应该为宇宙恒星形成的演化、星系间介质的再电离和宇宙的金属富集历史提供一个很好的探针。迄今为止，GRB测量到的最高红移是z = 4.50（参考文献5）。这里我们报道了爆发后3.4天获得的GRB 050904余辉的光谱；在光谱的长波长端，由于z约为6.3的莱曼α吸收（带有阻尼翼），在9000 a左右有一个明显的截止点，光谱显示出一个清晰的连续体。在z = 6.295 +/- 0.002的重元素吸收谱线系统也被检测到，得到了红移的精确测量。Si精细结构线表明，在GRB的前身周围有一个密集的、富含金属的环境。

The prompt gamma-ray emission from gamma-ray bursts (GRBs) should be detectable out to distances of z > 10 (ref. 1), and should therefore provide an excellent probe of the evolution of cosmic star formation, reionization of the intergalactic medium, and the metal enrichment history of the Universe. Hitherto, the highest measured redshift for a GRB has been z = 4.50 (ref. 5). Here we report the optical spectrum of the afterglow of GRB 050904 obtained 3.4 days after the burst; the spectrum shows a clear continuum at the long-wavelength end of the spectrum with a sharp cut-off at around 9,000 A due to Lyman alpha absorption at z approximately 6.3 (with a damping wing). A system of absorption lines of heavy elements at z = 6.295 +/- 0.002 was also detected, yielding the precise measurement of the redshift. The Si ii fine-structure lines suggest a dense, metal-enriched environment around the progenitor of the GRB.

An optical spectrum of the afterglow of a gamma-ray burst at a redshift of z = 6.295.

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