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• W2923356883 abstract "ABSTRACT We present a new statistical tool, called the triangle correlation function (TCF), inspired by the earlier work of Obreschkow et al. It is derived from the three-point correlation function and aims to probe the characteristic scale of ionized regions during the epoch of reionization from 21cm interferometric observations. Unlike most works, which focus on power spectrum, i.e. amplitude information, our statistic is based on the information we can extract from the phases of the Fourier transform of the ionization field. In this perspective, it may benefit from the well-known interferometric concept of closure phases. We find that this statistical estimator performs very well on simple ionization fields. For example, with well-defined fully ionized discs, there is a peaking scale, which we can relate to the radius of the ionized bubbles. We explore the robustness of the TCF when observational effects such as angular resolution and noise are considered. We also get interesting results on fields generated by more elaborate simulations such as 21CMFAST. Although the variety of sources and ionized morphologies in the early stages of the process make its interpretation more challenging, the nature of the signal can tell us about the stage of reionization. Finally, and in contrast to other bubble size distribution algorithms, we show that the TCF can resolve two different characteristic scales in a given map." @default.
• W2923356883 created "2019-04-01" @default.
• W2923356883 creator A5006821432 @default.
• W2923356883 creator A5039957125 @default.
• W2923356883 date "2019-08-09" @default.
• W2923356883 modified "2023-10-16" @default.
• W2923356883 title "Studying the morphology of reionization with the triangle correlation function of phases" @default.
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• W2923356883 doi "https://doi.org/10.1093/mnras/stz2195" @default.
• W2923356883 hasPublicationYear "2019" @default.
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