Imperial College London
Portrait Picture

Dr Jonathan R. Pritchard

Faculty of Natural Sciences, Department of Physics

Reader in Astrophysics
 
 
 
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Contact

 

+44 (0)20 7594 7557j.pritchard Website CV

 
 
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Location

 

1018CBlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gorce:2019:mnras/stz2195,
author = {Gorce, A and Pritchard, JR},
doi = {mnras/stz2195},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {1321--1337},
title = {Studying the morphology of reionisation with the triangle correlation function of phases},
url = {http://dx.doi.org/10.1093/mnras/stz2195},
volume = {489},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - AbstractWe present a new statistical tool, called the triangle correlation function (TCF), inspired by the earlier work of Obreschkow et al. (2013). It is derived from the 3-point correlation function and aims to probe the characteristic scale of ionised regions during the Epoch of Reionisation 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 ionisation 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 ionisation fields. For example, with well-defined fully ionised disks, there is a peaking scale, which we can relate to the radius of the ionised bubbles. We also 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 ionised 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 reionisation. 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.
AU  - Gorce,A
AU  - Pritchard,JR
DO  - mnras/stz2195
EP  - 1337
PY  - 2019///
SN  - 0035-8711
SP  - 1321
TI  - Studying the morphology of reionisation with the triangle correlation function of phases
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1093/mnras/stz2195
UR  - https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stz2195/5545599
UR  - http://hdl.handle.net/10044/1/72735
VL  - 489
ER  -
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