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Improved Constraints on The Neutral Intergalactic Hydrogen Surrounding Quasars at Redshifts z>6
Stuart Wyithe, Abraham Loeb, Chris Carilli
We analyze the evolution of HII regions around the seven known SDSS quasars at z>6. The comparison between observed and model radii of the HII regions generated by these quasars in…
Undetected Sources Allow Transmission of the Lyman-alpha Line From Galaxies Prior to Reionization
Stuart Wyithe, Abraham Loeb
The discovery of Lyman-alpha emission from galaxies at redshifts beyond z~6.5 should not be naively interpreted as implying that the intergalactic medium (IGM) had been reionized a…
Calibrating the Galaxy Halo - Black Hole Relation Based on the Clustering of Quasars
Stuart Wyithe, Abraham Loeb
The observed number counts of quasars may be explained either by long-lived activity within rare massive hosts, or by short-lived activity within smaller, more common hosts. It has…
Redshifted 21cm Signatures Around the Highest Redshift Quasars
Stuart Wyithe, Abraham Loeb
The Ly-alpha absorption spectrum of the highest redshift quasars indicates that they are surrounded by giant HII regions, a few Mpc in size. The neutral gas around these HII region…