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而且是暴周围的金属丰度。不是一般说伽马暴周围的金属丰度低的么？
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| Title: |
| A High-metallicity Host Environment for the Long-duration GRB 020819 |
| Authors: |
| Levesque, Emily M.; Kewley, Lisa J.; Graham, John F.; Fruchter, Andrew S. |
| Affiliation: |
| AA(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA ; Predoctoral Fellow, Smithsonian Astrophysical Observatory.; emsque@ifa.hawaii.edu ), AB(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA kewley@ifa.hawaii.edu), AC(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA graham@stsci.edu), AD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA fruchter@stsci.edu) |
| Publication: |
| The Astrophysical Journal Letters, Volume 712, Issue 1, pp. L26-L30 (2010). (ApJL Homepage) |
| Publication Date: |
| 03/2010 |
| Origin: |
| IOP |
| ApJ Keywords: |
| gamma-ray burst: individual: GRB 020819 |
| DOI: |
| 10.1088/2041-8205/712/1/L26 |
| Bibliographic Code: |
| 2010ApJ...712L..26L |
Abstract
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.
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