Linear effects of perturbed recombination

Details Linear effects of perturbed recombination Linear effects of perturbed recombination

2007-07-18

arxiv.org/abs/0707.2727v1

Phys.Rev.D76:063001,2007

Astronomy and Astrophysics

Astrophysics

5 pages; for more details of effect on 21cm see astro-ph/0702600; code available at http://camb.info/sources/

Scientific paper

10.1103/PhysRevD.76.063001

Perturbations in the ionization fraction after recombination affect the Compton cooling of density perturbations. Once the gas temperature starts to decouple from the CMB temperature, ionization fraction perturbations can have a significant influence on the subsequent gas temperature perturbation evolution. This directly affects the 21cm spin temperature of the gas, and also modifies the small-scale baryon perturbation evolution via the difference in baryon pressure. The effect on the gas temperature perturbations can be significant on all scales, and galactic-scale baryon perturbations are modified at the percent level at redshifts z >~ 100 where numerical simulations are typically started.

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