Greig, B.B.GreigMesinger, A.A.MesingerBañados, E.E.BañadosBecker, G. D.G. D.BeckerBosman, S. E. I.S. E. I.BosmanChen, H.H.ChenDavies, F. B.F. B.DaviesD'ODORICO, ValentinaValentinaD'ODORICOEilers, A. -C.A. -C.EilersGallerani, S.S.GalleraniHaehnelt, M. G.M. G.HaehneltKeating, L.L.KeatingLai, S.S.LaiQin, Y.Y.QinRyan-Weber, E.E.Ryan-WeberSatyavolu, S.S.SatyavoluWang, F.F.WangYang, J.J.YangZhu, Y.Y.Zhu2024-12-112024-12-1120240035-8711http://hdl.handle.net/20.500.12386/35460The attenuation of Lyα photons by neutral hydrogen in the intergalactic medium (IGM) at z ≳ 5 continues to be a powerful probe for studying the epoch of reionization. Given a framework to estimate the intrinsic (true) Lyα emission of high-z sources, one can infer the ionization state of the IGM during reionization. In this work, we use the enlarged XQR-30 sample of 42 high-resolution and high signal-to-noise quasar spectra between $5.8\lesssim \, z\lesssim \, 6.6$ obtained with VLT/X-shooter to place constraints on the IGM neutral fraction. This is achieved using our existing Bayesian QSO reconstruction framework which accounts for uncertainties such as the: (i) posterior distribution of predicted intrinsic Lyα emission profiles (obtained via covariance matrix reconstruction of the Lyα and N V emission lines from unattenuated high-ionization emission line profiles; C IV, Si IV + O IV], and C III]) and (ii) distribution of ionized regions within the IGM using synthetic damping wing profiles drawn from a 1.6<SUP>3</SUP> Gpc<SUP>3</SUP> reionization simulation. Following careful quality control, we used 23 of the 42 available QSOs to obtain constraints/limits on the IGM neutral fraction during the tail-end of reionization. Our median and 68th percentile constraints on the IGM neutral fraction are: $0.20\substack{+0.14 -0.12}$ and $0.29\substack{+0.14 -0.13}$ at z = 6.15 and 6.35. Further, we also report 68th percentile upper limits of $\bar{x}_{\mathrm{H\, {\small I}}{}} \lt 0.21$, 0.20, 0.21, and 0.18 at z = 5.8, 5.95, 6.05, and 6.55. These results imply reionization is still ongoing at $5.8\lesssim \, z\lesssim \, 6.55$, consistent with previous results from XQR-30 (dark fraction and Lyα forest) along with other observational probes considered in the literature.STAMPAenArticle10.1093/mnras/stae10802-s2.0-85193050698https://academic.oup.com/mnras/article/530/3/3208/7656977https://api.elsevier.com/content/abstract/scopus_id/851930506982024MNRAS.530.3208GFIS/05 - ASTRONOMIA E ASTROFISICA