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), M., Nysewander (1) ((1) Space Science Telescope Institute, (2) Johns Hopkins, University, (3) University of Hawaii, (4) University of Warwick
TL;DR
This paper reports the discovery of an unusually high metallicity host galaxy for the dark long gamma-ray burst GRB 051022, challenging previous assumptions about host environments.
Contribution
It provides spectroscopic measurements indicating the highest metallicity observed in a long gamma-ray burst host galaxy to date.
Findings
Host galaxy has log(O/H)+12 = 8.77 metallicity.
Host galaxy is highly luminous with M_B = -21.5.
Galaxy exhibits characteristics of rapid star formation.
Abstract
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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Taxonomy
TopicsAstronomy and Astrophysical Research · Stellar, planetary, and galactic studies · Astronomical Observations and Instrumentation