New simulation of QSO X-ray heating during the Cosmic Dawn
arXiv:1801.06527 · doi:10.1017/S1743921317011115
Abstract
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 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.
5 pages, 2 figures, Proceedings IAU Symposium No. 333, 2018
References in corpus (8)
- Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
- Lyman-alpha and CIII] Emission in z=7-9 Galaxies: Accelerated Reionization Around Luminous Star Forming Systems?
- Faint AGNs at z>4 in the CANDELS GOODS-S field: looking for contributors to the reionization of the Universe
- Spectroscopic detections of CIII]1909 at z~6-7: A new probe of early star forming galaxies and cosmic reionisation
- Heating the IGM by X-rays from Population III Binaries in High Redshift Galaxies
- Simulating the Impact of X-ray Heating during the Cosmic Dawn
- High redshift AGNs and HI reionisation: limits from the unresolved X-ray background
- The Thermal Proximity Effect: A New Probe of He II Reionization History and the Quasar Lifetime