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Evidence for Merger-Driven Activity in the Clustering of High Redshift Quasars
Stuart Wyithe, Abraham Loeb
Recently, a very large clustering length has been measured for quasars at a redshift of z~4. In combination with the observed quasar luminosity function we assess the implications…
A microlensing study of the accretion disc in the quasar MG 0414+0534
N. F. Bate, D. J. E. Floyd, R. L. Webster +1
Observations of gravitational microlensing in multiply imaged quasars currently provide the only direct probe of quasar emission region structure on sub-microarcsecond scales. Anal…
The Impact of HI in Galaxies on 21-cm Intensity Fluctuations During the Reionisation Epoch
Stuart Wyithe, Lila Warszawski, Paul M. Geil +1
We investigate the impact of neutral hydrogen (HI) in galaxies on the statistics of 21-cm fluctuations using analytic and semi-numerical modelling. Following the reionisation of hy…
Modification of the 21-cm power spectrum by X-rays during the epoch of reionisation
Lila Warszawski, Paul M. Geil, Stuart Wyithe
We incorporate a contribution to reionization from X-rays within analytic and semi-numerical simulations of the 21-cm signal arising from neutral hydrogen during the epoch of reion…
The 21cm Power Spectrum After Reionization
Stuart Wyithe, Abraham Loeb
We discuss the 21cm power spectrum (PS) following the completion of reionization. In contrast to the reionization era, this PS is proportional to the PS of mass density fluctuation…
Testing the Copernican Principle via Cosmological Observations
Krzysztof Bolejko, J. Stuart B. Wyithe
Observations of distances to Type-Ia supernovae can be explained by cosmological models that include either a gigaparsec-scale void, or a cosmic flow, without the need for Dark Ene…