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Escape fraction of ionizing photons from galaxies at z=0--6
Astrophysics · Submitted 20 May 2006
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim 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 $z\ga4$.
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The abstract, sentence by sentence
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 ($\sim900$ \AA rest-frame) to non-ionizing ultraviolet ($\sim1500$ \AA 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 $z\la1$ to about 0.1 at $z\ga4$.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The escape fraction of ionizing photons from galaxies is a crucial quantity controlling the cosmic ionizing background radiation and the reionization. | background 1.00 | 0.04 | 0.04 | asserted 1.00 |
| s1 | 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. | background 0.93 | 0.08 | 0.03 | asserted 0.67 |
| s2 | We compare them homogeneously in terms of the observed flux density ratio of ionizing ($\sim900$ \AA rest-frame) to non-ionizing ultraviolet ($\sim1500$ \AA rest-frame) corrected for the intergalactic absorption. | method 0.97 | 0.72 | 0.03 | asserted 0.94 |
| s3 | 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 $z\ga4$. | result 1.00 | 0.87 | 0.88 | asserted 1.00 |
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The paper
Original 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 ($\sim900$ \AA rest-frame) to non-ionizing ultraviolet ($\sim1500$ \AA 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 $z\la1$ to about 0.1 at $z\ga4$.
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2 arXiv papers cite this in 2 sentences
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Cites it as background 1 paper
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It should be noted that all these factors: metallicity, initial mass function, star formation efficiency, and escape fraction, are highly uncertain[For a recent take on the predictions and uncertainties for these quantities, and how the James Webb Space Telescope is expected to improve upon these, see for example Ref. [ref] .] [ref] .
On dark matter - dark radiation interaction and cosmic reionization · The parameter $N_ion$ · 0.89
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