Journal article

Beacons into the Cosmic Dark Ages: Boosted Transmission of Ly alpha from UV Bright Galaxies at z greater than or similar to 7

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

The Astrophysical Journal Letters | IOP PUBLISHING LTD | Published : 2018


Recent detections of Lyman alpha (Lyα) emission from z > 7.5 galaxies were somewhat unexpected given a dearth of previous non-detections in this era when the intergalactic medium (IGM) is still highly neutral. But these detections were from UV bright galaxies, which preferentially live in overdensities that reionize early, and have significantly Doppler-shifted Lyα line profiles emerging from their interstellar media (ISM), making them less affected by the global IGM state. Using a combination of reionization simulations and empirical ISM models we show, as a result of these two effects, that UV bright galaxies in overdensities have >2× higher transmission through the z ∼ 7 IGM than typical ..

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University of Melbourne Researchers


Awarded by NASA Earth and Space Science Fellowship Program

Awarded by European Research Council under the European Union

Awarded by Australian Research Council

Awarded by HST BoRG

Awarded by HST GLASS

Funding Acknowledgements

We thank Dan Stark and Crystal Martin for useful discussions. C.M. acknowledges support through the NASA Earth and Space Science Fellowship Program Grant NNX16AO85H. A.M. acknowledges European Research Council support under the European Union's Horizon 2020 research and innovation program (grant No. 638809-AIDA). M.T. acknowledges support by the Australian Research Council (awards FT130101593 and CE170100013). This work was supported by HST BoRG grants GO-12572, 12905, 13767, and 15212, and HST GLASS grant GO-13459.