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• W2095148441 abstract "One of the most dramatic signatures of the reionization era may be the enormous ionized bubbles around luminous quasars (with radii reaching ~40 comoving Mpc), which may survive as ionized regions long after their source shuts off. Here we study how the inhomogeneous intergalactic medium (IGM) evolves inside such fossils. The average recombination rate declines rapidly with time, and the brief quasar episode significantly increases the mean free path inside the fossil bubbles. As a result, even a weak ionizing background generated by galaxies inside the fossil can maintain it in a relatively highly and uniformly ionized state. For example, galaxies that would ionize 20%-30% of hydrogen in a random patch of the IGM can maintain 80%-90% ionization inside the fossil for a duration much longer than the average recombination time in the IGM. Quasar fossils at z 10 thus retain their identity for nearly a Hubble time and appear gray, distinct from both the average IGM (which has a ionization topology and a lower mean ionized fraction) and the fully ionized bubbles around active quasars. More distant fossils, at z 10, have a weaker galaxy-generated ionizing background and a higher gas density, so they can attain a Swiss cheese topology similar to the rest of the IGM, but with a smaller contrast between the ionized bubbles and the partially neutral regions separating them. Analogous He III fossils should exist around the epoch of He II/He III reionization at z ~ 3, although rapid recombination inside the He III fossils is more common. Our model of inhomogeneous recombination also applies to double-reionization models and shows that a nonmonotonic reionization history is even more unlikely than previously thought." @default.
• W2095148441 created "2016-06-24" @default.
• W2095148441 creator A5067199828 @default.
• W2095148441 creator A5070588335 @default.
• W2095148441 creator A5085339462 @default.
• W2095148441 date "2008-10-10" @default.
• W2095148441 modified "2023-10-05" @default.
• W2095148441 title "Fossil Ionized Bubbles around Dead Quasars during Reionization" @default.
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• W2095148441 doi "https://doi.org/10.1086/591047" @default.

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