Light-cone anisotropy in 21cm fluctuations during the epoch of reionization

Details Light-cone anisotropy in 21cm fluctuations during the epoch of reionization Light-cone anisotropy in 21cm fluctuations during the epoch of reionization

2005-12-17

arxiv.org/abs/astro-ph/0512453v2

Mon.Not.Roy.Astron.Soc.Lett.372:L43-L47,2006

Astronomy and Astrophysics

Astrophysics

5 journal pages, 4 figures, MNRAS Letters, revised version

Scientific paper

10.1111/j.1745-3933.2006.00222.x

The delay in light travel time along the line of sight generates an anisotropy in the power spectrum of 21cm brightness fluctuations from the epoch of reionization. We show that when the fluctuations in the neutral hydrogen fraction become non-linear at the later stages of reionization, the light-cone anisotropy becomes of order unity on scales >50 comoving Mpc. During this period the density fluctuations and the associated anisotropy generated by peculiar velocities are negligible in comparison.

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