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Abstract: The cosmological background of ionizing radiation has been dominated byquasars once the Universe aged by ~2 billion years. At earlier times redshiftsz>3, the observed abundance of bright quasars declined sharply, implying thatcosmic hydrogen was reionized by stars instead. Here, we explain the physicalorigin of the transition between the dominance of stars and quasars as ageneric feature of structure formation in the concordance LCDM cosmology. Atearly times, the fraction of baryons in galaxies grows faster than the maximumEddington-limited growth rate possible for quasars. As a result, quasars werenot able to catch up with the rapid early growth of stellar mass in their hostgalaxies.



Autor: Abraham Loeb Harvard

Fuente: https://arxiv.org/







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