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High-signal to noise observations of the Ly$\alpha$ forest transmissivity inthe z = 7.085 QSO ULAS J1120+0641 show seven narrow transmission spikesfollowed by a long 240 cMpc/h trough. Here we use radiative transfersimulations of cosmic reionization previously calibrated to match a wider rangeof Ly$\alpha$ forest data to show that the occurrence of seven transmissionspikes in the narrow redshift range z = 5.85 - 6.1 is very sensitive to theexact timing of reionization. Occurrence of the spikes requires the most underdense regions of the IGM to be already fully ionised. The rapid onset of a longtrough at z = 6.12 requires a strong decrease of the photo-ionisation rate atz$\sim$6.1 in this line-of-sight, consistent with the end of percolation atthis redshift. The narrow range of reionisation histories that we previouslyfound to be consistent with a wider range of Ly$\alpha$ forest data have areasonable probability of showing seven spikes and the mock absorption spectraprovide an excellent match to the spikes and the trough in the observedspectrum of ULAS J1120+0641. Despite the large overall opacity of Ly$\alpha$ atz > 5.8, larger samples of high signal-to-noise observations of raretransmission spikes should therefore provide important further insights intothe exact timing of the percolation of HII bubbles at the tail-end ofreionization

monthly notices of the royal astronomical society

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