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:2021:0004-6361/202140515,
author = {Gorce, A and Hutter, A and Pritchard, JR},
doi = {0004-6361/202140515},
journal = {Astronomy and Astrophysics: a European journal},
pages = {1--14},
title = {Using the sample variance of 21cm maps as a tracer of the ionisation topology},
url = {http://dx.doi.org/10.1051/0004-6361/202140515},
volume = {653},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Intensity mapping of the 21cm signal of neutral hydrogen will yield excitinginsights into the Epoch of Reionisation and the nature of the first galaxies.However, the large amount of data that will be generated by the next generationof radio telescopes, such as the Square Kilometre Array (SKA), as well as thenumerous observational obstacles to overcome, require analysis techniques tunedto extract the reionisation history and morphology. In this context, weintroduce a one-point statistic, to which we refer as the local variance,$\sigma_\mathrm{loc}$, that describes the distribution of the mean differential21cm brightness temperatures measured in two-dimensional maps along thefrequency direction of a light-cone. The local variance takes advantage of whatis usually considered an observational bias, the sample variance. We find theredshift-evolution of the local variance to not only probe the reionisationhistory of the observed patches of the sky, but also trace the ionisationmorphology. This estimator provides a promising tool to constrain the midpointof reionisation as well as gaining insight into the ionising properties ofearly galaxies.
AU  - Gorce,A
AU  - Hutter,A
AU  - Pritchard,JR
DO  - 0004-6361/202140515
EP  - 14
PY  - 2021///
SN  - 0004-6361
SP  - 1
TI  - Using the sample variance of 21cm maps as a tracer of the ionisation topology
T2  - Astronomy and Astrophysics: a European journal
UR  - http://dx.doi.org/10.1051/0004-6361/202140515
UR  - http://arxiv.org/abs/2102.04352v1
UR  - https://www.aanda.org/articles/aa/full_html/2021/09/aa40515-21/aa40515-21.html
UR  - http://hdl.handle.net/10044/1/86978
VL  - 653
ER  -
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