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We show herein that a proto-cluster of Ly$\alpha$ emitting galaxies,spectroscopically confirmed at redshift 6.5, produces a remarkable number ofionising continuum photons. We start from the Ly$\alpha$ fluxes measured in thespectra of the sources detected spectroscopically. From these fluxes we derivethe ionising emissivity of continuum photons of the proto-cluster, which wecompare with the ionising emissivity required to reionise the proto-clustervolume. We find that the sources in the proto-cluster are capable of ionising alarge bubble, indeed larger than the volume occupied by the proto-cluster. Forvarious calculations we have used the model AMIGA, in particular to derive theemissivity of the Lyman continuum photons required to maintain the observedvolume ionised. Besides, we have assumed the ionising photons escape fractiongiven by AMIGA at this redshift.

An ionised bubble powered by a proto-cluster at z = 6.5