Unusually High Metallicity Host Of The Dark LGRB 051022

2); (2) Johns Hopkins University; (3) University of Hawaii; (4) University of Warwick; (5) University of Leicester; (6) University of North Carolina at Chapel Hill); A. J. Levan (4); A. S. Fruchter (1); D. E. Reichart (6); E. M. Levesque (3)

arxiv: 0903.5544 · v1 · submitted 2009-03-31 · 🌌 astro-ph.CO

Unusually High Metallicity Host Of The Dark LGRB 051022

J. F. Graham (1 , 2) , A. S. Fruchter (1) , L. J. Kewley (3) , E. M. Levesque (3) , A. J. Levan (4) , N. R. Tanvir (5) , D. E. Reichart (6)

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M. Nysewander (1) ((1) Space Science Telescope Institute (2) Johns Hopkins University (3) University of Hawaii (4) University of Warwick (5) University of Leicester (6) University of North Carolina at Chapel Hill)

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keywords hostmetallicityburstdarkgalaxyhighlgrbunusually

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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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Unusually High Metallicity Host Of The Dark LGRB 051022

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