Modelling recombinations during cosmological reionization

Details Modelling recombinations during cosmological reionization Modelling recombinations during cosmological reionization

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.412l..16r&link_type=abstract

Monthly Notices of the Royal Astronomical Society: Letters, Volume 412, Issue 1, pp. L16-L19.

Astronomy and Astrophysics

Astronomy

6

Radiative Transfer, Methods: Numerical, Cosmology: Dark Ages, Reionization, First Stars

Scientific paper

An ionization front expanding into a neutral medium can be slowed down significantly by recombinations. In cosmological numerical simulations the recombination rate is often computed using a ‘clumping factor’ that takes into account that not all scales in the simulated density field are resolved. Here we demonstrate that using a single value of the clumping factor significantly overestimates the recombination rate, and how a local estimate of the clumping factor is both easy to compute, and gives significantly better numerical convergence. We argue that this lower value of the recombination rate is more relevant during the reionization process and hence that the importance of recombinations during reionization has been overestimated.

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