A HIGH-METALLICITY HOST ENVIRONMENT FOR THE LONG-DURATION GRB 020819
A HIGH-METALLICITY HOST ENVIRONMENT FOR THE LONG-DURATION GRB 020819
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DOI：
10.1088/2041-8205/712/1/l26
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
E. Levesque;L. Kewley;J. Graham;A. Fruchter
中科院分区：
文献类型：
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作者：
E. Levesque;L. Kewley;J. Graham;A. Fruchter
我们给出了长持续时间伽马射线暴020819的宿主星系和爆炸地点的能谱观测结果。我们确定了这个宿主环境的金属丰度为log(O/H)+12=9.0±0.1，这是迄今为止为长时间伽马射线暴(LGRB)确定的最高金属丰度。我们将伽马射线暴020819宿主环境的金属丰度和其他性质与现有的观测结果进行了比较，并考虑了这种金属丰度对我们理解大伽玛暴前驱星系情景的影响。我们还考虑了这种异常高的金属丰度是如何与伽玛暴020819的状态有关的，它是一个没有探测到光学余辉的“暗”爆发。
We present spectroscopic observations of the host galaxy and explosion site of 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 gamma-ray burst (LGRB) to date. We compare the metallicity and other properties of the GRB 020819 host environment to existing observations of LGRB host galaxies and consider the implications that this metallicity has for our understanding of LGRB 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.