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We describe a new methodology to analyze the reionization process innumerical simulations: The evo- lution of the reionization is investigated byfocusing on the merger histories of individual HII regions. From the mergertree of ionized patches, one can track the individual evolution of the regionssuch as e.g. their size, or investigate the properties of the percolationprocess by looking at the formation rate, the frequency of mergers and thenumber of individual HII regions involved in the mergers. By applying thistechnique to cosmological simulations with radiative transfer, we show how thismethodology is a good candidate to quantify the impact of the star formationadopted on the history of the reionization. As an application we show howdifferent models of sources result in different evolutions and geometry of thereionization even though they produce e.g. similar ionized fraction or opticaldepth.

Simulated histories of reionization with merger tree of HII regions