Unusually High Metallicity Host Of The Dark LGRB 051022

Details Unusually High Metallicity Host Of The Dark LGRB 051022 Unusually High Metallicity Host Of The Dark LGRB 051022

2009-03-31

arxiv.org/abs/0903.5544v1

AIP Conf.Proc.1133:269-272,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Conference procedings for The Sixth Huntsville Gamma-Ray Burst Symposium 2008 October 20-23 (3 pages, 2 figures)

Scientific paper

10.1063/1.3155900

We present spectroscopy of the host of GRB 051022 with GMOS nod and shuffle on Gemini South and NIRSPEC on Keck II. We determine a metallicity for the host of log(O/H)+12 = 8.77 using the R23 method (Kobulnicky & Kewley 2004 scale) making this the highest metallicity long burst host yet observed. The galaxy itself is unusually luminous for a LGRB host with a rest frame B band absolute magnitude -21.5 and has the spectrum of a rapidly star-forming galaxy. Our work raises the question of whether other dark burst hosts will show high metallicities.

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