Cosmic Reionization On Computers: Reionization Histories of Present-day Galaxies

Abstract

We examine the reionization history of present-day galaxies by explicitly tracing the building blocks of halos from the Cosmic Reionization On Computers project. We track dark matter particles that belong to $z=0$ halos to trace the neutral fractions at corresponding positions during rapid global reionization. The resulting particle reionization histories allow us to explore different definitions of a halo's reionization redshift and to account for the neutral content of the interstellar medium. Consistent with previous work, we find a systematic trend of reionization redshift with mass - present day halos with higher masses have earlier reionization times. Finally, we quantify the spread of reionization times within each halo, which also has a mass dependence.

arXiv comment7 pages, 5 figures, Accepted to ApJ

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• Galaxy Formation and Reionization: Key Unknowns and Expected Breakthroughs by the James Webb Space Telescope
• The Formation Times and Building Blocks of Milky Way-mass Galaxies in the FIRE Simulations
• GRUMPY: a simple framework for realistic forward-modelling of dwarf galaxies
• Topology of Reionisation times: concepts, measurements and comparisons to gaussian random field predictions
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• Forward-modelling the Luminosity, Distance, and Size distributions of the Milky Way Satellites
• Cosmic Reionization On Computers: Baryonic Effects on Halo Concentrations During the Epoch of Reionization