Reionization in the Light of Dark Stars

Author:

Gondolo Paolo,Sandick Pearl,Shams Es Haghi BarmakORCID,Visbal EliORCID

Abstract

Abstract We investigate the effect of dark stars (DSs) on the reionization history of the universe, and the interplay between them and feedback due to Lyman–Werner (LW) radiation in reducing the cosmic microwave background (CMB) optical depth to a value within the τ = 0.054 ± 0.007 range measured by Planck. We use a semianalytic approach to evaluate reionization histories and CMB optical depths, which includes Population II stars in atomic cooling halos and Population III stars in minihalos with LW feedback, preceded by a DS phase. We show that while LW feedback by itself can reduce the integrated optical depth to the last scattering surface to ∼0.05 only if the Population III star formation efficiency is less than ∼0.2%, the inclusion of a population of DSs can naturally lead to the measured CMB optical depth for much larger Population III star formation efficiencies ≳1%.

Funder

National Science Foundation United States

NASA Grant

JSPS Grant-in-Aid for Scientific Research Number

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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