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Long troughs in the Lyman-$\alpha$ forest below redshift 6 due to islands of neutral hydrogen
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abstract
A long (110 cMpc/$h$) and deep absorption trough in the Ly$\alpha$ forest has been observed extending down to redshift 5.5 in the spectrum of ULAS J0148+0600. Although no Ly$\alpha$ transmission is detected, Ly$\beta$ spikes are present which has led to claims that the gas along this trough must be ionized. Using high resolution cosmological radiative transfer simulations in large volumes, we show that in a scenario where reionization ends late ($z \sim 5.2$), our simulations can reproduce troughs as long as observed. In this model, we find that the troughs are caused by islands of neutral hydrogen. Small ionized holes within the neutral islands allow for the transmission of Ly$\beta$. We have also modelled the Ly$\alpha$ emitter population around the simulated troughs, and show that there is a deficit of Ly$\alpha$ emitters close to the trough as is observed.
Forward citations
Cited by 3 Pith papers
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Ringing of the Reionization: A first direct measurement of the intergalactic pressure smoothing scale at redshift z>4.2 as imprinted onto small-scale peculiar velocities in the Lyman-alpha forest
A claimed first direct measurement of the IGM pressure smoothing scale at z≈4.2–5.0 from a fitted peak in the Lyman-alpha flux power spectrum, tied to an acoustic feature in the peculiar velocity gradient.
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An emulator for the ionizing photon mean free path in ultra-high resolution simulations: the implications of mean free path measurements for the reionization history
Photon mean-free-path observations at z≈5–6, interpreted with a neural-network emulator of high-resolution radiative-transfer simulations, favor a late, extended reionization with substantial neutral hydrogen persisti...
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Probing the ionizing photon output of galaxies near cosmic dawn with the patchy kSZ effect
In calibrated reionization simulations, the patchy kSZ power at ell~3000 correlates strongly with the start of reionization once the end is fixed by Lyman-alpha forest data, yielding model-dependent limits on early io...
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