Early reionization by decaying particles in the light of three year WMAP data

Details Early reionization by decaying particles in the light of three year WMAP data Early reionization by decaying particles in the light of three year WMAP data

2006-08-14

arxiv.org/abs/astro-ph/0608283v2

JCAP 0702:010,2007

Astronomy and Astrophysics

Astrophysics

9 pages, 11 figures

Scientific paper

10.1088/1475-7516/2007/02/010

We study the reionization histories where ionizing UV photons are emitted from decaying particles, in addition to usual contributions from stars and quasars, taking account of the fact that the universe is not fully ionized until z = 6 as observed by Sloan Digital Sky Survey. Likelihood analysis of the three-year data from the WMAP (Wilkinson Microwave Anisotropy Probe) severely constrains the decaying particle scenario.In particular, the decaying particle with relatively short lifetime is not favored by the polarization data.

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