%0 Generic %1 meyer2019galaxies %A Meyer, Romain A. %A Kakiichi, Koki %A Bosman, Sarah E. I. %A Ellis, Richard S. %A Laporte, Nicolas %A Robertson, Brant E. %A Ryan-Weber, Emma V. %A Mawatari, Ken %A Zitrin, Adi %D 2019 %K library %T The role of galaxies and AGN in reionising the IGM -- III : IGM-galaxy cross-correlations at z~6 from 8 quasar fields with DEIMOS and MUSE %U http://arxiv.org/abs/1912.04314 %X We present improved results of the measurement of the correlation between galaxies and the intergalactic medium (IGM) transmission at the end of reionisation. We have gathered a sample of $13$ spectroscopically confirmed Lyman-break galaxies (LBGs) and $21$ Lyman-$\alpha$ emitters (LAEs) at angular separations $20'' 10'$ ($0.1-4$ pMpc at $z\sim 6$) from the sightlines to $8$ background $z6$ quasars. We report for the first time the detection of an excess of Lyman-$\alpha$ transmission spikes at $10-60$ cMpc from LAEs ($3.6\sigma$) and LBGs ($3.1\sigma$). We interpret the data with an improved model of the galaxy-Lyman-$\alpha$ transmission and two-point cross-correlations which includes the enhanced photoionisation due to clustered faint sources, enhanced gas densities around the central bright objects and spatial variations of the mean free path. The observed LAE(LBG)-Lyman-$\alpha$ transmission spike two-point cross-correlation function (2PCCF) constrains the luminosity-averaged escape fraction of all galaxies contributing to reionisation to $f_esc \rangle_M_\rm UV<-12 = 0.10_-0.05^+0.17\,(0.18_-0.06^+0.52)$. We investigate if the 2PCCF measurement can determine whether bright or faint galaxies are the dominant contributors to reionisation. Our results show that a contribution from faint galaxies ($M_UV > -20 \, (2\sigma)$) is necessary to reproduce the observed 2PCCF and that reionisation might be driven by different sub-populations around LBGs and LAEs at $z6$.

@misc{meyer2019galaxies, abstract = {We present improved results of the measurement of the correlation between galaxies and the intergalactic medium (IGM) transmission at the end of reionisation. We have gathered a sample of $13$ spectroscopically confirmed Lyman-break galaxies (LBGs) and $21$ Lyman-$\alpha$ emitters (LAEs) at angular separations $20'' \lesssim \theta \lesssim 10'$ ($\sim 0.1-4$ pMpc at $z\sim 6$) from the sightlines to $8$ background $z\gtrsim 6$ quasars. We report for the first time the detection of an excess of Lyman-$\alpha$ transmission spikes at $\sim 10-60$ cMpc from LAEs ($3.6\sigma$) and LBGs ($3.1\sigma$). We interpret the data with an improved model of the galaxy-Lyman-$\alpha$ transmission and two-point cross-correlations which includes the enhanced photoionisation due to clustered faint sources, enhanced gas densities around the central bright objects and spatial variations of the mean free path. The observed LAE(LBG)-Lyman-$\alpha$ transmission spike two-point cross-correlation function (2PCCF) constrains the luminosity-averaged escape fraction of all galaxies contributing to reionisation to $\langle f_{\rm esc} \rangle_{M_{\rm UV}<-12} = 0.10_{-0.05}^{+0.17}\,(0.18_{-0.06}^{+0.52})$. We investigate if the 2PCCF measurement can determine whether bright or faint galaxies are the dominant contributors to reionisation. Our results show that a contribution from faint galaxies ($M_{\rm UV} > -20 \, (2\sigma)$) is necessary to reproduce the observed 2PCCF and that reionisation might be driven by different sub-populations around LBGs and LAEs at $z\sim 6$.}, added-at = {2019-12-11T07:34:17.000+0100}, author = {Meyer, Romain A. and Kakiichi, Koki and Bosman, Sarah E. I. and Ellis, Richard S. and Laporte, Nicolas and Robertson, Brant E. and Ryan-Weber, Emma V. and Mawatari, Ken and Zitrin, Adi}, biburl = {https://www.bibsonomy.org/bibtex/2a65bc77bc80c21e5e720b772b90a3699/gpkulkarni}, description = {The role of galaxies and AGN in reionising the IGM -- III : IGM-galaxy cross-correlations at z~6 from 8 quasar fields with DEIMOS and MUSE}, interhash = {2630de9df0453b1e009a5dbc3d9dbf79}, intrahash = {a65bc77bc80c21e5e720b772b90a3699}, keywords = {library}, note = {cite arxiv:1912.04314Comment: Submitted to MNRAS. 17 pages, 18 figures, 3 tables + appendices. Key results: Figs. 6,13,14}, timestamp = {2019-12-11T07:34:17.000+0100}, title = {The role of galaxies and AGN in reionising the IGM -- III : IGM-galaxy cross-correlations at z~6 from 8 quasar fields with DEIMOS and MUSE}, url = {http://arxiv.org/abs/1912.04314}, year = 2019 }