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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…
Detecting the Earliest Galaxies Through Two New Sources of 21cm Fluctuations
Rennan Barkana, Abraham Loeb
The first galaxies that formed at a redshift ~20-30 emitted continuum photons with energies between the Lyman-alpha and Lyman limit wavelengths of hydrogen, to which the neutral un…
A Size of ~10 Mpc for the Ionized Bubbles at the End of Cosmic Reionization
Stuart Wyithe, Abraham Loeb
The first galaxies to appear in the universe at redshifts z>20 created ionized bubbles in the intergalactic medium of neutral hydrogen left over from the Big-Bang. It is thought th…
Is Double Reionization Physically Plausible?
Steven Furlanetto, Abraham Loeb
Recent observations of z~6 quasars and the cosmic microwave background imply a complex history to cosmic reionization. Such a history requires some form of feedback to extend reion…
A Method for Separating the Physics from the Astrophysics of High-Redshift 21cm Fluctuations
Rennan Barkana, Abraham Loeb
Fluctuations in the 21cm brightness from cosmic hydrogen at redshifts z > 6 were sourced by the primordial density perturbations from inflation as well as by the radiation from gal…
The Environmental Impact of Supermassive Black Holes
Abraham Loeb
The supermassive black holes observed at the centers of almost all present-day galaxies, had a profound impact on their environment. I highlight the principle of self-regulation, b…