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- W2117323006 abstract "We present new upper limits on the volume-weighted neutral hydrogen fraction, |$bar{x}_{rm H,small {i}}$|, at z ∼ 5–6 derived from spectroscopy of bright quasars. The fraction of the Lyα and Lyβ forests that is ‘dark’ (with zero flux) provides the only model-independent upper limit on |$bar{x}_{rm H,small {i}}$|, requiring no assumptions about the physical conditions in the intergalactic medium or the quasar's unabsorbed UV continuum. In this work, we update our previous results using a larger sample (22 objects) of medium-depth (∼ few hours) spectra of high-redshift quasars obtained with the Magellan, MMT, and VLT. This significantly improves the upper bound on |$bar{x}_{rm H,small {i}}$| derived from dark pixel analysis to |$bar{x}_{rm H,small {i}}le 0.06{+0.05 (1sigma )}$| at z = 5.9 and |$bar{x}_{rm H,small {i}}le 0.04{+0.05 (1sigma )}$| at z = 5.6. These results provide robust constraints for theoretical models of reionization, and provide the strongest available evidence that reionization has completed (or is very nearly complete) by z ≈ 6." @default.
- W2117323006 created "2016-06-24" @default.
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- W2117323006 date "2014-12-18" @default.
- W2117323006 modified "2023-10-14" @default.
- W2117323006 title "Model-independent evidence in favour of an end to reionization by z ≈ 6" @default.
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- W2117323006 doi "https://doi.org/10.1093/mnras/stu2449" @default.
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