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

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

2010-01-06

arxiv.org/abs/1001.0970v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 3 figures, accepted for publication in ApJ Letters

Scientific paper

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.

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