A CRASH simulation of the contribution of binary stars to the epoch of reionization

Abstract

We use a set of 3D radiative transfer simulations to study the effect that a large fraction of binary stars in galaxies during the epoch of reionization has on the physical properties of the intergalactic medium (i.e. the gas temperature and the ionization state of hydrogen and helium), on the topology of the ionized bubbles and on the 21 cm power spectra. Consistently to previous literature, we find that the inclusion of binary stars can speed up the reionization process of HI and HeI, while HeII reionization is still dominated by more energetic sources, especially accreting black holes. The earlier ionization attained with binary stars allows for more time for cooling and recombination, so that gas fully ionized by binary stars is typically colder than that ionized by single stars at any given redshift. With the same volume averaged ionization fraction, the inclusion of binary stars results in fewer small ionized bubbles and more large ones, with visible effects also on the large scales of the 21 cm power spectrum.

14 pages, 11 figures, MNRAS accepted

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Cited by in corpus (4)

• The THESAN project: ionizing escape fractions of reionization-era galaxies
• SPICE: the connection between cosmic reionisation and stellar feedback in the first galaxies
• Ionizing photon production and escape fractions during cosmic reionization in the TNG50 simulation
• Gravitational waves from mergers of Population III binary black holes: roles played by two evolution channels