%0 Generic %1 choudhury2014lymanalpha %A Choudhury, Tirthankar Roy %A Puchwein, Ewald %A Haehnelt, Martin G. %A Bolton, James S. %D 2014 %K alpha emitters lyman reionization %T Lyman-$\alpha$ emitters gone missing: evidence for late reionization? %U http://arxiv.org/abs/1412.4790 %X We combine high resolution hydrodynamical simulations with an intermediate resolution, dark matter only simulation and an analytical model for the growth of ionized regions to estimate the large scale distribution and redshift evolution of the visibility of Ly$\alpha$ emission in $6 z8$ galaxies. The inhomogeneous distribution of neutral hydrogen during the reionization process results in significant fluctuations in the Ly$\alpha$ transmissivity on large scales, and is sensitive not only to the ionized fraction of the intergalactic medium by volume and amplitude of the local ionizing background, but also to the relative velocity shift of the Ly$\alpha$ emission line due to resonant scattering. We reproduce a decline in the space density of Ly$\alpha$ emitting galaxies as rapid as observed with a volume-weighted neutral fraction of $30$ (50) per cent at $z=7$ ($z=8$), and a typical Ly$\alpha$ line velocity offset of $100\rm\,km\,s^-1$ redward of systemic at $z=6$ which decreases toward higher redshift. The latest preliminary (12/2014) Planck results indicate such a recent end to reionization is no longer disfavoured by constraints from the cosmic microwave background.

@misc{choudhury2014lymanalpha, abstract = {We combine high resolution hydrodynamical simulations with an intermediate resolution, dark matter only simulation and an analytical model for the growth of ionized regions to estimate the large scale distribution and redshift evolution of the visibility of Ly$\alpha$ emission in $6 \leq z\leq 8$ galaxies. The inhomogeneous distribution of neutral hydrogen during the reionization process results in significant fluctuations in the Ly$\alpha$ transmissivity on large scales, and is sensitive not only to the ionized fraction of the intergalactic medium by volume and amplitude of the local ionizing background, but also to the relative velocity shift of the Ly$\alpha$ emission line due to resonant scattering. We reproduce a decline in the space density of Ly$\alpha$ emitting galaxies as rapid as observed with a volume-weighted neutral fraction of $\sim 30$ (50) per cent at $z=7$ ($z=8$), and a typical Ly$\alpha$ line velocity offset of $100\rm\,km\,s^{-1}$ redward of systemic at $z=6$ which decreases toward higher redshift. The latest preliminary (12/2014) Planck results indicate such a recent end to reionization is no longer disfavoured by constraints from the cosmic microwave background.}, added-at = {2014-12-17T09:29:05.000+0100}, author = {Choudhury, Tirthankar Roy and Puchwein, Ewald and Haehnelt, Martin G. and Bolton, James S.}, biburl = {https://www.bibsonomy.org/bibtex/2c8b72fbf769568bfc5352ad04f6c8f63/miki}, description = {[1412.4790] Lyman-$\alpha$ emitters gone missing: evidence for late reionization?}, interhash = {f901115b67ff1afe3de0c42ca508d202}, intrahash = {c8b72fbf769568bfc5352ad04f6c8f63}, keywords = {alpha emitters lyman reionization}, note = {cite arxiv:1412.4790Comment: 17 pages, submitted to MNRAS}, timestamp = {2014-12-17T09:29:05.000+0100}, title = {Lyman-$\alpha$ emitters gone missing: evidence for late reionization?}, url = {http://arxiv.org/abs/1412.4790}, year = 2014 }