%0 Generic %1 sparre2013highredshift %A Sparre, M. %A Hartoog, O. E. %A Krühler, T. %A Fynbo, J. P. U. %A Watson, D. J. %A Wiersema, K. %A D'Elia, V. %A De Cia, A. %A Afonso, P. M. J. %A Covino, S. %A Postigo, A. de Ugarte %A Flores, H. %A Goldoni, P. %A Greiner, J. %A Hjorth, J. %A Jakobsson, P. %A Kaper, L. %A Klose, S. %A Malesani, D. %A Milvang-Jensen, B. %A Nardini, M. %A Piranomonte, S. %A Sollerman, J. %A Ramirez, R. Sanchez %A Schulze, S. %A Tanvir, N. R. %A Vergani, S. D. %A Wijers, R. A. M. J. %A Zafar, T. %D 2013 %K dla high-z %T Two high-redshift DLAs towards a z~5 gamma-ray burst %U http://arxiv.org/abs/1309.2940 %X 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 abundance patterns, metallicity, dust content and extinction of the GRB host galaxy (z=5.0) as well as a Damped Lyman-alpha Absorber (DLA) galaxy along the line of sight (z=4.6). These systems have column densities of log N =22.30 +/- 0.06 and 21.34 +/- 0.10, respectively. The GRB host galaxy has a metallicity of 2% solar (based on sulfur), and a lower limit of the metallicity for the intervening DLA is 3% (based on silicon). For the intervening absorber we also measure -1.73<Fe/H<-1.09, but the true metallicity can be higher, because it is unclear how much the abundances are affected by dust depletion. The presence and variability of fine-structure lines confirms the z=5.0 system as the GRB host. This is the highest redshift where Fe II fine-structure lines have been detected. The afterglow is only mildly reddened with A_V = 0.11 +/- 0.04 mag, and the host galaxy has a dust-to-metals ratio which is consistent with being equal to or lower than typical values in the Local Group.

@misc{sparre2013highredshift, abstract = {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 abundance patterns, metallicity, dust content and extinction of the GRB host galaxy (z=5.0) as well as a Damped Lyman-alpha Absorber (DLA) galaxy along the line of sight (z=4.6). These systems have column densities of log N =22.30 +/- 0.06 and 21.34 +/- 0.10, respectively. The GRB host galaxy has a metallicity of 2% solar (based on sulfur), and a lower limit of the metallicity for the intervening DLA is 3% (based on silicon). For the intervening absorber we also measure -1.73<[Fe/H]<-1.09, but the true metallicity can be higher, because it is unclear how much the abundances are affected by dust depletion. The presence and variability of fine-structure lines confirms the z=5.0 system as the GRB host. This is the highest redshift where Fe II fine-structure lines have been detected. The afterglow is only mildly reddened with A_V = 0.11 +/- 0.04 mag, and the host galaxy has a dust-to-metals ratio which is consistent with being equal to or lower than typical values in the Local Group.}, added-at = {2013-09-13T16:45:10.000+0200}, author = {Sparre, M. and Hartoog, O. E. and Krühler, T. and Fynbo, J. P. U. and Watson, D. J. and Wiersema, K. and D'Elia, V. and De Cia, A. and Afonso, P. M. J. and Covino, S. and Postigo, A. de Ugarte and Flores, H. and Goldoni, P. and Greiner, J. and Hjorth, J. and Jakobsson, P. and Kaper, L. and Klose, S. and Malesani, D. and Milvang-Jensen, B. and Nardini, M. and Piranomonte, S. and Sollerman, J. and Ramirez, R. Sanchez and Schulze, S. and Tanvir, N. R. and Vergani, S. D. and Wijers, R. A. M. J. and Zafar, T.}, biburl = {https://www.bibsonomy.org/bibtex/29b7894e6ae7f270e1343c4c6824fa08a/miki}, description = {[1309.2940] Two high-redshift DLAs towards a z~5 gamma-ray burst}, interhash = {571e69e6f7016c99611b52967514fb11}, intrahash = {9b7894e6ae7f270e1343c4c6824fa08a}, keywords = {dla high-z}, note = {cite arxiv:1309.2940Comment: 13 pages, 9 figures, Submitted to ApJ}, timestamp = {2013-09-13T16:45:10.000+0200}, title = {Two high-redshift DLAs towards a z~5 gamma-ray burst}, url = {http://arxiv.org/abs/1309.2940}, year = 2013 }