Does the light cone effect make reionization HI 21-cm power spectrum anisotropic?

K. K. Datta1*, H. Jensen2, S. Majumdar2, G. Mellema2 and I. T. Iliev3
1National Centre For Radio Astrophysics, Post Bag 3, Ganeshkhind, Pune 411007, India
2Department of Astronomy & Oskar Klein Centre, AlbaNova, Stockholm University, SE-106 91 Stockholm, Sweden
3Astronomy Centre, Department of Physics & Astronomy, Pevensey II Building, University of Sussex, Falmer, Brighton BN1 9QH

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Abstract

Redshifted HI 21-cm signal from the reionization epoch evolves considerably along the line of sight direction of any observed volume. Using simulations we investigate this so-called ‘light-cone’ effect on the HI 21-cm power spectrum. In particular, we investigate whether the effect introduces anisotropies in the power spectra and could not find any.



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Keywords : supernova remnants – radio lines: ISM – H II regions – radio continuum