Journal article

Modification of the 21-cm power spectrum by X-rays during the epoch of reionization

L Warszawski, PM Geil, JSB Wyithe

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2009

Abstract

We incorporate a contribution to reionization from X-rays within analytic and seminumerical simulations of the 21-cm signal arising from neutral hydrogen during the epoch of reionization. The relatively long X-ray mean free path (MFP) means that ionizations due to X-rays are not subject to the same density bias as UV ionizations, resulting in a substantive modification to the statistics of the 21-cm signal. We explore the impact that X-ray ionizations have on the power spectrum (PS) of 21-cm fluctuations by varying both the average X-ray MFP and the fractional contribution of X-rays to reionization. In general, prior to the epoch when the intergalactic medium (IGM) is dominated by ionized re..

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University of Melbourne Researchers

Grants

Funding Acknowledgements

We wish to thank Steve Furlanetto for detailed comments on an earlier draft of this paper. We also thank the anonymous referee, whose report served to improve this paper. LW and PMG acknowledge the support of Australian Postgraduate Awards. PMG is grateful for the hospitality of the Institute for Theory and Computation at the Harvard-Smithsonian Centre for Astrophysics. The research was supported by the Australian Research Council (JSBW).