%0 Journal Article %T Light cone effect on the reionization 21-cm signal - II. Evolution, anisotropies and observational implications %+ Institut d'Astrophysique de Paris (IAP) %A Datta, Kanan K. %A Jensen, Hannes %A Majumdar, Suman %A Mellema, Garrelt %A Iliev, Ilian T. %A Mao, Yi %A Shapiro, Paul R. %A Ahn, Kyungjin %< avec comité de lecture %@ 0035-8711 %J Monthly Notices of the Royal Astronomical Society %I Oxford University Press (OUP): Policy P - Oxford Open Option A %V 442 %P 1491-1506 %8 2014 %D 2014 %Z 1402.0508 %Z 2014MNRAS.442.1491D %R 10.1093/mnras/stu927 %K methods: numerical %K methods: statistical %K cosmology: theory %K dark ages %K reionization %K first stars %K diffuse radiation %K Astrophysics - Cosmology and Nongalactic Astrophysics %Z Sciences of the Universe [physics] %Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles %X Measurements of the H I 21-cm power spectra from the reionization epoch will be influenced by the evolution of the signal along the line-of-sight direction of any observed volume. We use numerical as well as seminumerical simulations of reionization in a cubic volume of 607 Mpc across to study this so-called light-cone effect on the H I 21-cm power spectrum. We find that the light-cone effect has the largest impact at two different stages of reionization: one when reionization is ∼20 per cent and other when it is ∼80 per cent completed. We find a factor of ∼4 amplification of the power spectrum at the largest scale available in our simulations. We do not find any significant anisotropy in the 21-cm power spectrum due to the light-cone effect. We argue that for the power spectrum to become anisotropic, the light-cone effect would have to make the ionized bubbles significantly elongated or compressed along the line of sight, which would require extreme reionization scenarios. We also calculate the two-point correlation functions parallel and perpendicular to the line of sight and find them to differ. Finally, we calculate an optimum frequency bandwidth below which the light-cone effect can be neglected when extracting power spectra from observations. We find that if one is willing to accept a 10 per cent error due to the light-cone effect, the optimum frequency bandwidth for k = 0.056 Mpc-1 is ∼7.5 MHz. For k = 0.15 and 0.41 Mpc-1, the optimum bandwidth is ∼11 and ∼16 MHz, respectively. %G English %2 https://insu.hal.science/insu-03645338/document %2 https://insu.hal.science/insu-03645338/file/stu927.pdf %L insu-03645338 %U https://insu.hal.science/insu-03645338 %~ INSU %~ CNRS %~ IAP %~ SORBONNE-UNIVERSITE %~ SU-INF-2018 %~ SU-SCIENCES %~ SU-TI %~ ALLIANCE-SU