2010

Topology and Sizes of HII Regions during Cosmic Reionization

Friedrich, Martina M., Mellema, Garrelt, Alvarez, Marcelo A. et al.

Understand

We use the results of large-scale simulations of reionization to explore methods for characterizing the topology and sizes of HII regions during reionization.

We use four independent methods for characterizing the sizes of ionized regions.
Three of them give us a full size distribution: the friends-of-friends (FOF) method, the spherical average method (SPA) and the power spectrum (PS) of the ionized fraction.
These latter three methods are complementary: While the FOF method captures the size distribution of the small scale H II regions, which contribute only a small amount to the total ionization fraction, the spherical average method provides a smoothed measure for the average size of the H II regions constituting the main contribution to the ionized fraction, and the power spectrum does the same while retaining more details on the size distribution.

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