期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 512, 期 4, 页码 5390-5403出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac825
关键词
galaxies: high-redshift; intergalactic medium; cosmology: theory; dark ages, reionization, first stars; diffuse radiation; early Universe
资金
- Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) [CE170100013]
- European Research Council (ERC) under the European Union [638809]
- NASA - Space Telescope Science Institute [HST-HF2- 51448.001-A]
- NASA [NAS5-26555]
- European Research Council (ERC) [638809] Funding Source: European Research Council (ERC)
This study utilizes the Ly alpha damping wing absorption in the spectra of bright, high-redshift quasars to probe the ionization state of the intergalactic medium. By using a Bayesian framework and reionization simulations, the authors obtain constraints on the distribution of ionized regions at different redshifts. Combining the data from multiple quasars, a unified constraint on the epoch of reionization is derived.
Bright, high-redshift (z > 6) QSOs are powerful probes of the ionization state of the intervening intergalactic medium (IGM). The detection of Ly a damping wing absorption imprinted in the spectrum of high-z QSOs can provide strong constraints on the epoch of reionization (EoR). In this work, we perform an independent Ly alpha damping wing analysis of two known z > 7 QS05; DESJ0252-0503 at z = 7.00 (Wang et al.) and J1007+2115 at z = 7.51 (Yang et al.). For this, we utilize 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 N v) and (ii) the distribution of ionized (H II) regions within the IGM using a 1.6(3) Gpc(3) reionization simulation. This approach is complementary to that used in the aforementioned works as it focuses solely redward of Ly alpha (1218 < lambda < 1230 angstrom) making it more robust to modelling uncertainties while also using a different methodology for (i) and (ii). We find, for an EoR morphology driven by galaxies within M-h greater than or similar to 10(9) M-circle dot haloes, (x) over barH(I) = 0.64(-0.23)(+0.19) (68 percent) at z = 7 and (x) over barH(I) = 0.27(-0.17)(+0.21) at z = 7.51 consistent within 1 sigma to the previous works above, though both are slightly lower in amplitude. Following the inclusion of N v 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 (Bafiados et al.) finding (x) over barH(I )= 0.44(-0.24)(+0.23) at z = 7.09 and (x) over barH(I) = 0.31(-0.19)(+0.18 )at z = 7.54. Finally, we combine the QSO damping wing constraints for all four z greater than or similar to 7 QSO5 to obtain a single, unified constraint of (x) over barH(I) = 0.49(-0.11)(+0.11) at z = 7.29.
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