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The Astrophysical Journal


The Astrophysical Journal Volume 785 Number 2

M. Sparre et al. 2014 ApJ 785 150 doi:10.1088/0004-637X/785/2/150

THE METALLICITY AND DUST CONTENT OF A REDSHIFT 5 GAMMA-RAY BURST HOST GALAXY*

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M. Sparre1, O. E. Hartoog2, T. Krühler1,3, J. P. U. Fynbo1, D. J. Watson1, K. Wiersema4, V. D'Elia5,6, T. Zafar7, P. M. J. Afonso8, S. Covino9, A. de Ugarte Postigo1,10, H. Flores11, P. Goldoni12, J. Greiner13, J. Hjorth1, P. Jakobsson14, L. Kaper2, S. Klose15, A. J. Levan16, D. Malesani1, B. Milvang-Jensen1, M. Nardini17, S. Piranomonte18, J. Sollerman19, R. Sánchez-Ramírez10, S. Schulze20,21, N. R. Tanvir4, S. D. Vergani9,11, and R. A. M. J. Wijers2

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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 $\log N({{\rm H}\,{\scriptsize {I}}})/{\rm cm}^{-2}=22.30\pm 0.06$ 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 detected. The afterglow is mildly reddened with AV = 0.11 ± 0.04 mag, and the host galaxy has a DTM that is consistent with being equal to or lower than typical values in the Local Group.


Footnote
*  Based on observations carried out under ESO program ID 088.A-0051(B) and 091.A-0703(A).
Keywords

dust, extinction; galaxies: high-redshift; gamma-ray burst: individual (GRB 111008A)


Dates

Issue 2 (2014 April 20)

Received 2013 September 12, accepted for publication 2014 March 10

Published 2014 April 4

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