Determining the escape fraction of ionizing photons during reionization with the GRB-derived star formation rate
JSB Wyithe, AM Hopkins, MD Kistler, H Yueksel, JF Beacom
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2010
The fraction of ionizing photons that escape their host galaxies and so are able to ionize hydrogen in the inter-galactic medium (IGM) is a critical parameter in the analyses of the reionization era and early galaxy formation. Studies of the reionization history normally suffer from a degeneracy between the unknown values for the efficiency with which high-redshift galaxies turn mass into stars and the escape fraction of ionizing photons. Recent gamma-ray burst (GRB) measurements of the star formation rate density during reionization provide the first opportunity to break this degeneracy. We confront a semi-analytic model for reionization with the GRB-derived star formation rate, as well as ..View full abstract
Awarded by NSF CAREER
Awarded by DOE
This work was supported in part by the Australian Research Council (JSBW and AMH). MDK and JFB were supported by NSF CAREER Grant PHY-0547102 (to JFB) and HY by DOE Grant DE-FG02-91ER40626.