Journal article

The Universe Is Reionizing at z similar to 7: Bayesian Inference of the IGM Neutral Fraction Using Ly alpha Emission from Galaxies

Charlotte A Mason, Tommaso Treu, Mark Dijkstra, Andrei Mesinger, Michele Trenti, Laura Pentericci, Stephane de Barros, Eros Vanzella

ASTROPHYSICAL JOURNAL | IOP PUBLISHING LTD | Published : 2018

Abstract

We present a new flexible Bayesian framework for directly inferring the fraction of neutral hydrogen in the intergalactic medium (IGM) during the Epoch of Reionization (EoR, z ∼ 6-10) from detections and non-detections of Lyman Alpha (Lyα) emission from Lyman Break galaxies (LBGs). Our framework combines sophisticated reionization simulations with empirical models of the interstellar medium (ISM) radiative transfer effects on Lyα. We assert that the Lyα line profile emerging from the ISM has an important impact on the resulting transmission of photons through the IGM, and that these line profiles depend on galaxy properties. We model this effect by considering the peak velocity offset of Lyα..

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University of Melbourne Researchers

Grants

Awarded by NASA Headquarters through the NASA Earth and Space Science Fellowship Program


Awarded by European Research Council (ERC) under the European Unions Horizon research and innovation program


Awarded by Australian Research Council


Awarded by HST BoRG


Awarded by HST GLASS


Funding Acknowledgements

C.M. acknowledges support by NASA Headquarters through the NASA Earth and Space Science Fellowship Program Grant NNX16AO85H. A.M. acknowledges support from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program (grant agreement No 638809 AIDA). This research was partially supported by the Australian Research Council through awards FT130101593 and CE170100013. This work was supported by the HST BoRG grants GO-12572, 12905, and 13767, and the HST GLASS grant GO-13459.