Escape fraction of ionizing photons from galaxies at z=0--6

Abstract

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 ($\sim 900$ Årest-frame) to non-ionizing ultraviolet ($\sim 1500$ Årest-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 $z\la1$ to about 0.1 at $z\ga4$.

MNRAS Letters, in press

References in corpus (2)

• Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 in the Subaru Deep Fields: Photometric Properties
• Significant primordial star formation at redshifts z ~ 3-4

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