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Title:
Relative Role of Stars and Quasars in Cosmic Reionization
Authors:
Volonteri, Marta; Gnedin, Nickolay Y.
Affiliation:
AA(Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA ), AB(Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510, USA ; Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA ; Department of Astronomy & Astrophysics, The University of Chicago, Chicago, IL 60637, USA; )
Publication:
The Astrophysical Journal, Volume 703, Issue 2, pp. 2113-2117 (2009). (ApJ Homepage)
Publication Date:
10/2009
Origin:
IOP
ApJ Keywords:
cosmology: theory, galaxies: formation, intergalactic medium, large-scale structure of universe
DOI:
10.1088/0004-637X/703/2/2113
Bibliographic Code:
2009ApJ...703.2113V

Abstract

We revisit the classical view that quasar contribution to the reionization of hydrogen is unimportant. When secondary ionizations 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 gsim 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.
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