Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 371, Issue 1, Pages L1-L5Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2006.00195.x
Keywords
galaxies : evolution; intergalactic medium; cosmology : observations; diffuse radiation
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The escape fraction of ionizing photons from galaxies is a crucial quantity controlling the cosmic ionizing background radiation and the reionization. Various estimates of this parameter can be obtained in the redshift range z = 0-6, either from direct observations or from the observed ionizing background intensities. We compare them homogeneously in terms of the observed flux density ratio of ionizing (similar to 900 angstrom rest-frame) to non-ionizing ultraviolet (similar to 1500 angstrom rest-frame) corrected for the intergalactic absorption. The escape fraction is found to increase by an order of magnitude, from a value less than 0.01 at z less than or similar to 1 to about 0.1 at z greater than or similar to 4.
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