Journal article
Results from EDGES High-band. II. Constraints on Parameters of Early Galaxies
RA Monsalve, B Greig, JD Bowman, A Mesinger, AEE Rogers, TJ Mozdzen, NS Kern, N Mahesh
Astrophysical Journal | IOP PUBLISHING LTD | Published : 2018
Abstract
We use the sky-average spectrum measured by EDGES High-band (90-190 MHz) to constrain parameters of early galaxies independent of the absorption feature at 78 MHz reported by Bowman et al. These parameters represent traditional models of cosmic dawn and the epoch of reionization produced with the 21cmFAST simulation code. The parameters considered are (1) the UV ionizing efficiency (ζ); (2) minimum halo virial temperature hosting efficient star-forming galaxies (Tvir min); (3) integrated soft-band X-ray luminosity (LX<2KeV/SFR); and (4) minimum X-ray energy escaping the first galaxies (E 0), corresponding to a typical H i column density for attenuation through the interstellar medium. The Hi..
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Grants
Awarded by Horizon 2020 Framework Programme
Funding Acknowledgements
We thank Rennan Barkana, Anastasia Fialkov, Jordan Mirocha, and Julian Munoz for useful discussions. We are grateful to the reviewer for valuable comments and suggestions. This work was supported by the NSF through research awards for the Experiment to Detect the Global EoR Signature (AST-0905990, AST-1207761, and AST-1609450). R.A.M. was supported by the NASA Solar System Exploration Virtual Institute cooperative agreement 80ARC017M0006, and by the NASA Ames Research Center grant NNX16AF59G. The Centre for All-Sky Astrophysics in 3D (ASTRO 3D) is an Australian Research Council Centre of Excellence, funded by grant CE170100013. This work was also supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No 638809-AIDA-PI: Mesinger). EDGES is located at the Murchison Radio-astronomy Observatory. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. We thank CSIRO for providing site infrastructure and support.