%0 Generic %1 Diaz2011 %A Diaz, C. Gonzalo %A Ryan-Weber, Emma V. %A Cooke, Jeff %A Pettini, Max %A Madau, Piero %A ., %D 2011 %K CIV high-z igm metallicity winds %T A galaxy as the source of a Civ absorption system close to the epoch of reionization %U http://arxiv.org/abs/1104.4194 %X We find a bright (L_UV=2.5 L*_z=6) Lyman alpha emitter at redshift z=5.719 at a projected distance of 79 physical kpc from a strong triply ionized carbon (Civ) absorption system at redshift z=5.7238 previously reported in the spectrum of the z_em = 6.309 QSO SDSS J1030+0524. This is the highest redshift galaxy-absorber pair detected to-date, supporting the idea that galaxy-wide outflows were already in place at the end of the epoch of reionization. The proximity of this object makes it the most likely source of metals, consistent with models of outflows at lower redshift where significant observational evidence relates metal absorption systems with galaxies hosting outflows. Moreover, we estimate that the probability of a closer, fainter galaxy being responsible for the absorption system is only 10^-3. In a typical outflow scenario, a wind of 200 \kms, active since the universe was only 0.6 Gyr old (z ~8.4), could eject metals out to 79 kpc at z=5.719. Although the origin of metals in the intergalactic medium (IGM) is still under debate, our results are consistent with predictions from cosmological simulations which reproduce the evolution of the cosmic density of Civ, from z ~ 6 to the present day based on outflow-driven enrichment of the IGM. We also report two more Lyman alpha emitters in this field, at z=5.973\pm 0.002 and z=5.6760.002 respectively, the former confirming the original identification by Stiavelli et al. Our results suggest that the colour cut typically used to identify i-dropouts (i_775-z_850>1.3) misses a non-negligible fraction of blue galaxies with faint UV continuum at z 5.7.

@misc{Diaz2011, abstract = { We find a bright (L_{UV}=2.5 L*_{z=6}) Lyman alpha emitter at redshift z=5.719 at a projected distance of 79 physical kpc from a strong triply ionized carbon (Civ) absorption system at redshift z=5.7238 previously reported in the spectrum of the z_{em} = 6.309 QSO SDSS J1030+0524. This is the highest redshift galaxy-absorber pair detected to-date, supporting the idea that galaxy-wide outflows were already in place at the end of the epoch of reionization. The proximity of this object makes it the most likely source of metals, consistent with models of outflows at lower redshift where significant observational evidence relates metal absorption systems with galaxies hosting outflows. Moreover, we estimate that the probability of a closer, fainter galaxy being responsible for the absorption system is only 10^{-3}. In a typical outflow scenario, a wind of 200 \kms, active since the universe was only 0.6 Gyr old (z ~8.4), could eject metals out to 79 kpc at z=5.719. Although the origin of metals in the intergalactic medium (IGM) is still under debate, our results are consistent with predictions from cosmological simulations which reproduce the evolution of the cosmic density of Civ, from z ~ 6 to the present day based on outflow-driven enrichment of the IGM. We also report two more Lyman alpha emitters in this field, at z=5.973\pm 0.002 and z=5.676\pm 0.002 respectively, the former confirming the original identification by Stiavelli et al. Our results suggest that the colour cut typically used to identify i-dropouts (i_{775}-z_{850}>1.3) misses a non-negligible fraction of blue galaxies with faint UV continuum at z \geq 5.7. }, added-at = {2011-04-22T12:45:02.000+0200}, author = {Diaz, C. Gonzalo and Ryan-Weber, Emma V. and Cooke, Jeff and Pettini, Max and Madau, Piero and .}, biburl = {https://www.bibsonomy.org/bibtex/2a7738153db0a10f68bc359c4827f65f5/miki}, description = {[1104.4194] A galaxy as the source of a Civ absorption system close to the epoch of reionization}, interhash = {11fd78f245399cc75e14dd287c899921}, intrahash = {a7738153db0a10f68bc359c4827f65f5}, keywords = {CIV high-z igm metallicity winds}, note = {cite arxiv:1104.4194 Comment: 9 pages, 3 figures, 1 table, submitted to MNRAS}, timestamp = {2011-04-22T12:45:02.000+0200}, title = {A galaxy as the source of a Civ absorption system close to the epoch of reionization}, url = {http://arxiv.org/abs/1104.4194}, year = 2011 }