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arXiv 1001.0970astro-ph.HE
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长时程GRB 020819的高金属度宿主环境

A High-Metallicity Host Environment for the Long-Duration GRB 020819

Emily M. Levesque, Lisa J. Kewley, John F. Graham, Andrew S. Fruchter

摘要:

本文介绍了长持续时间伽马射线暴GRB 020819的宿主星系和爆炸地点的光谱观测结果。我们确定的金属丰度为log(O/H)+ 12 = 9.0 +/- 0.1,到目前为止,最高的金属丰度确定了一个长时间的伽玛射线暴。我们比较金属丰度和其他属性的GRB 020819主机环境的现有观测的长时间GRB主机星系,并考虑这种金属丰度的影响,我们的理解长时间GRB祖场景。我们还考虑了这种异常高的金属丰度可能与GRB 020819的“暗”爆发状态有关,没有检测到光学余辉。

英文摘要:

We present spectroscopic observations of the host galaxy and explosion site of the long-duration gamma-ray burst GRB 020819. We determine a metallicity for this host environment of log(O/H) + 12 = 9.0 +/- 0.1, by far the highest metallicity determined for a long-duration GRB to date. We compare the metallicity and other properties of the GRB 020819 host environment to existing observations of long-duration GRB host galaxies, and consider the implications that this metallicity has for our understanding of long-duration GRB progenitor scenarios. We also consider how this unusually high metallicity may relate to the status of GRB 020819 as a "dark" burst, with no detected optical afterglow.

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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