Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2018

A tale of seven narrow spikes and a long trough: constraining the timing of the percolation of HII bubbles at the tail end of reionization with ULAS J1120+0641

Martin G. Haehnelt
  • Fonction : Auteur
Sarah E.I. Bosman
  • Fonction : Auteur
Ewald Puchwein

Résumé

High signal-to-noise observations of the Ly α forest transmissivity in the z = 7.085 quasi-stellar object (QSO) ULAS J1120+0641 show seven narrow transmission spikes followed by a long 240 cMpc h^−1 trough. Here, we use radiative transfer simulations of cosmic reionization previously calibrated to match a wider range of Ly α forest data to show that the occurrence of seven transmission spikes in the narrow redshift range z = 5.85–6.1 is very sensitive to the exact timing of reionization. Occurrence of the spikes requires the most underdense regions of the intergalactic medium to be already fully ionized. The rapid onset of a long trough at z = 6.12 requires a strong decrease of the photoionization rate Γ at z ≳ 6.1 in this line of sight, consistent with the end of percolation at this redshift. The narrow range of reionization histories that we previously found to be consistent with a wider range of Ly α forest data have a reasonable probability of showing seven spikes and the mock absorption spectra provide an excellent match to the spikes and the trough in the observed spectrum of ULAS J1120+0641. Larger samples of high signal-to-noise searches for rare Ly α transmission spikes at z > 5.8 should therefore provide important further insights into the exact timing of the percolation of H ii bubbles at the tail end of reionization.

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hal-01724758 , version 1 (04-06-2024)

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Jonathan Chardin, Martin G. Haehnelt, Sarah E.I. Bosman, Ewald Puchwein. A tale of seven narrow spikes and a long trough: constraining the timing of the percolation of HII bubbles at the tail end of reionization with ULAS J1120+0641. Monthly Notices of the Royal Astronomical Society, 2018, 473 (1), pp.765-775. ⟨10.1093/mnras/stx2362⟩. ⟨hal-01724758⟩
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