The metallicity and dust content of a redshift 5 gamma-ray burst host galaxy
- Sparre, M.
- Hartoog, O. E.
- Krühler, T.
- Fynbo, J. P. U.
- Watson, D. J.
- Wiersema, K.
- D'Elia, V.
- Zafar, T.
- Afonso, P. M. J.
- Covino, S.
- de Ugarte Postigo, A.
- Flores, H.
- Goldoni, P.
- Greiner, J.
- Hjorth, J.
- Jakobsson, P.
- Kaper, L.
- Klose, S.
- Levan, Andrew J.
- Malesani, D.
- Milvang-Jensen, B.
- Nardini, M.
- Piranomonte, S.
- Sollerman, J.
- Sánchez-Ramírez, R.
- Schulze, S.
- Tanvir, N. R.
- Vergani, S. D.
- Wijers, R. A. M. J.
DOIAbstract
Observations of the afterglows of long gamma-ray bursts (GRBs) allow the study of star-forming galaxies across most of cosmic history. Here we present observations of GRB 111008A, from which we can measure metallicity, chemical abundance patterns, dust-to-metals ratio (DTM), and extinction of the GRB host galaxy at z = 5.0. The host absorption system is a damped Lyα absorber with a very large neutral hydrogen column density of log N(H i)/cm−2 = 22.30 ± 0.06 and a metallicity of [S/H] = −1.70 ± 0.10. It is the highest-redshift GRB with such a precise metallicity measurement. The presence of fine-structure lines confirms the z = 5.0 system as the GRB host galaxy and makes this the highest redshift where Fe ii fine-structure lines have been d...
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