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New simulation of QSO X-ray heating during the Cosmic Dawn

Published online by Cambridge University Press:  08 May 2018

Hannah E. Ross ,
Keri Dixon ,
Ilian Iliev  and
Garrelt Mellema
Hannah E. Ross*
Affiliation:
Department of Physics and Astronomy, University of Sussex, Falmer, BN1 9QH, UK
Keri Dixon
Affiliation:
New York University Abu Dhabi, Computational Research Building, Abu Dhabi, UAE
Ilian Iliev
Affiliation:
Department of Physics and Astronomy, University of Sussex, Falmer, BN1 9QH, UK
Garrelt Mellema
Affiliation:
AlbaNova SCFAB, Astronomi, 106 91, Stockholm, Sweden
*
*email: H.Ross@sussex.ac.uk
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Abstract

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The upcoming radio interferometer Square Kilometre Array is expected to directly detect the redshifted 21-cm signal from the Cosmic Dawn for the first time. In this era temperature fluctuations from X-ray heating of the neutral intergalactic medium can impact this signal dramatically. Previously, in Ross et al. (2017), we presented the first large-volume, 244 h-1 Mpc=349 Mpc a side, fully numerical radiative transfer simulations of X-ray heating. This work is a follow-up where we now also consider QSO-like sources in addition to high mass X-ray binaries. Images of the two cases are clearly distinguishable at SKA1-LOW resolution and have RMS fluctuations above the expected noise. The inclusion of QSOs leads to a dramatic increase in non-Gaussianity of the signal, as measured by the skewness and kurtosis of the 21-cm signal. We conclude that this increased non-Gaussianity is a promising signature of early QSOs.

Keywords

cosmology: theory — radiative transfer — reionization — intergalactic medium — large-scale structure of universe — galaxies: formation — QSOs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 34 - 38
Copyright
Copyright © International Astronomical Union 2018 

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