Relative Role of Stars and Quasars in Cosmic Reionization

Abstract

We revisit the classical view that quasar contribution to the reionization of hydrogen is unimportant. When secondary ionization are taken into account, in many plausible scenarios for the formation and growth of supermassive black holes quasars contribute substantially or even dominantly at z>8, although their contribution generally falls below that of star-forming galaxies by z=6. Theoretical models that guide the design of the first generation of redshifted 21 cm experiments must, therefore, substantially account for the quasar contribution in order to be even qualitatively accurate.

Astrophysical Journal, in press

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Cited by in corpus (21)

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• An X-ray Selected Sample of Candidate Black Holes in Dwarf Galaxies
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• Definitive upper bound on the negligible contribution of quasars to cosmic reionization
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• Difficulties in Mid-Infrared selection of AGN in dwarf galaxies
• Late-end reionization with ATON-HE: towards constraints from Lyman-$\alpha$ emitters observed with JWST
• The Impact of Unresolved Turbulence on the Escape Fraction of Lyman Continuum Photons
• Effect of primordial non-Gaussianities on the far-UV luminosity function of high-redshift galaxies: implications for cosmic reionization
• JADES reveals a large population of low mass black holes at high redshift
• On the Evolution of High-Redshift Active Galactic Nuclei
• AGN ruled out as the dominant source of cosmic reionization
• Blueberry galaxies up to 200 Mpc and their optical and infrared properties
• Radio properties of Green Pea galaxies
• The Composite Spectral Energy Distribution of Quasars is Surprisingly Universal Since Cosmic Noon
• The Fundamentals of the 21-cm Line