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- W4200629658 abstract "Bright, high redshift ($z>6$) QSOs are powerful probes of the ionisation state of the intervening intergalactic medium (IGM). The detection of Ly$alpha$ damping wing absorption imprinted in the spectrum of high-z QSOs can provide strong constraints on the epoch of reionisation (EoR). In this work, we perform an independent Ly$alpha$ damping wing analysis of two known $z>7$ QSOs; DESJ0252-0503 at $z=7.00$ (Wang et al.) and J1007+2115 at $z=7.51$ (Yang et al.). For this, we utilise our existing Bayesian framework which simultaneously accounts for uncertainties in: (i) the intrinsic Ly$alpha$ emission profile (reconstructed from a covariance matrix of measured emission lines; extended in this work to include NV) and (ii) the distribution of ionised (H,{scriptsize II}) regions within the IGM using a $1.6^3$ Gpc$^3$ reionisation simulation. This approach is complementary to that used in the aforementioned works as it focuses solely redward of Ly$alpha$ ($1218 < lambda < 1230$AA) making it more robust to modelling uncertainties while also using a different methodology for (i) and (ii). We find, for a fiducial EoR morphology, $bar{x}_{rm HI} = 0.64substack{+0.19 -0.23}$ (68 per cent) at $z=7$ and $bar{x}_{rm HI} = 0.27substack{+0.21 -0.17}$ at $z=7.51$ consistent within $1sigma$ to the previous works above, though both are slightly lower in amplitude. Following the inclusion of NV into our reconstruction pipeline, we perform a reanalysis of ULASJ1120+0641 at $z=7.09$ (Mortlock et al.) and ULASJ1342+0928 at $z=7.54$ (Ba~nados et al.) finding $bar{x}_{rm HI} = 0.44substack{+0.23 -0.24}$ at $z=7.09$ and $bar{x}_{rm HI} = 0.31substack{+0.18 -0.19}$ at $z=7.54$. Finally, we combine the QSO damping wing constraints for all four $zgtrsim7$ QSOs to obtain a single, unified constraint of $bar{x}_{rm HI} = 0.49substack{+0.11 -0.11}$ at $z=7.29$." @default.
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- W4200629658 date "2021-12-07" @default.
- W4200629658 modified "2023-09-27" @default.
- W4200629658 title "IGM damping wing constraints on reionisation from covariance reconstruction of two $zgtrsim7$ QSOs" @default.
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