Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-05-01
Astrophys.J.703:2113-2117,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Astrophysical Journal, in press
Scientific paper
10.1088/0004-637X/703/2/2113
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.
Gnedin Nick
Volonteri Marta
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