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Two Modes of LyC Escape From Bursty Star Formation: Implications for [C II] Deficits and the Sources of Reionization
Astrophysics of Galaxies · Submitted 17 Oct 2022
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Finally, we show that leakers with $f_{\rm esc}>20\%$ dominate the ionizing photon budget at $z\gtrsim7.5$ but the contribution from galaxies with $f_{\rm esc}<5\%$ becomes significant at the tail-end of reionization.
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We use the SPHINX$^{20}$ cosmological radiation hydrodynamics simulation to study how Lyman Continuum (LyC) photons escape from galaxies and the observational signatures of this escape. We define two classes of LyC leaker: Bursty Leakers and Remnant Leakers, based on their star formation rates (SFRs) that are averaged over 10 Myr (SFR$_{10}$) or 100 Myr (SFR$_{100}$). Both have $f_{\rm esc}>20\%$ and experienced an extreme burst of star formation, but Bursty Leakers have ${\rm SFR_{10}>SFR_{100}}$, while Remnant Leakers have ${\rm SFR_{10}<SFR_{100}}$. The maximum SFRs in these bursts were typically $\sim100$ times greater than the SFR of the galaxy prior to the burst, a rare $2\sigma$ outlier among the general high-redshift galaxy population. Bursty Leakers are qualitatively similar to ionization-bounded nebulae with holes, exhibiting high ionization parameters and typical HII region gas densities. Remnant Leakers show properties of density-bounded nebulae, having normal ionization parameters but much lower HII region densities. Both types of leaker exhibit [CII]$_{\rm 158\mu m}$ deficits on the [CII]-SFR$_{100}$ relation, while only Bursty Leakers show deficits when SFR$_{10}$ is used. We predict that [CII] luminosity and SFR indicators such as H$\alpha$ and M$_{\rm 1500\r{A}}$ can be combined to identify both types of LyC leaker and the mode by which photons are escaping. These predictions can be tested with [CII] observations of known $z=3-4$ LyC leakers. Finally, we show that leakers with $f_{\rm esc}>20\%$ dominate the ionizing photon budget at $z\gtrsim7.5$ but the contribution from galaxies with $f_{\rm esc}<5\%$ becomes significant at the tail-end of reionization.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We use the SPHINX$^{20}$ cosmological radiation hydrodynamics simulation to study how Lyman Continuum (LyC) photons escape from galaxies and the observational signatures of this escape. | method 0.53 | 0.95 | 0.03 | asserted 0.85 |
| s1 | We define two classes of LyC leaker: Bursty Leakers and Remnant Leakers, based on their star formation rates (SFRs) that are averaged over 10 Myr (SFR$_{10}$) or 100 Myr (SFR$_{100}$). | method 0.61 | 0.93 | 0.05 | asserted 0.99 |
| s2 | Both have $f_{\rm esc}>20\%$ and experienced an extreme burst of star formation, but Bursty Leakers have ${\rm SFR_{10}>SFR_{100}}$, while Remnant Leakers have ${\rm SFR_{10}<SFR_{100}}$. | method 0.42 | 0.89 | 0.11 | asserted 1.00 |
| s3 | The maximum SFRs in these bursts were typically $\sim100$ times greater than the SFR of the galaxy prior to the burst, a rare $2\sigma$ outlier among the general high-redshift galaxy population. | result 0.98 | 0.87 | 0.05 | asserted 0.99 |
| s4 | Bursty Leakers are qualitatively similar to ionization-bounded nebulae with holes, exhibiting high ionization parameters and typical HII region gas densities. | result 0.83 | 0.86 | 0.06 | asserted 0.99 |
| s5 | Remnant Leakers show properties of density-bounded nebulae, having normal ionization parameters but much lower HII region densities. | result 0.92 | 0.89 | 0.06 | asserted 1.00 |
| s6 | Both types of leaker exhibit [CII]$_{\rm 158\mu m}$ deficits on the [CII]-SFR$_{100}$ relation, while only Bursty Leakers show deficits when SFR$_{10}$ is used. | result 1.00 | 0.90 | 0.15 | asserted 1.00 |
| s7 | We predict that [CII] luminosity and SFR indicators such as H$\alpha$ and M$_{\rm 1500\r{A}}$ can be combined to identify both types of LyC leaker and the mode by which photons are escaping. | interpretation 0.44 | 0.76 | 0.26 | asserted 0.57 |
| s8 | These predictions can be tested with [CII] observations of known $z=3-4$ LyC leakers. | future work 1.00 | 0.17 | 0.05 | hedged possibility 0.73 |
| s9 | Finally, we show that leakers with $f_{\rm esc}>20\%$ dominate the ionizing photon budget at $z\gtrsim7.5$ but the contribution from galaxies with $f_{\rm esc}<5\%$ becomes significant at the tail-end of reionization. | result 0.86 | 0.92 | 0.28 | asserted 1.00 |
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Original abstract
We use the SPHINX$^{20}$ cosmological radiation hydrodynamics simulation to study how Lyman Continuum (LyC) photons escape from galaxies and the observational signatures of this escape. We define two classes of LyC leaker: Bursty Leakers and Remnant Leakers, based on their star formation rates (SFRs) that are averaged over 10 Myr (SFR$_{10}$) or 100 Myr (SFR$_{100}$). Both have $f_{\rm esc}>20\%$ and experienced an extreme burst of star formation, but Bursty Leakers have ${\rm SFR_{10}>SFR_{100}}$, while Remnant Leakers have ${\rm SFR_{10}<SFR_{100}}$. The maximum SFRs in these bursts were typically $\sim100$ times greater than the SFR of the galaxy prior to the burst, a rare $2\sigma$ outlier among the general high-redshift galaxy population. Bursty Leakers are qualitatively similar to ionization-bounded nebulae with holes, exhibiting high ionization parameters and typical HII region gas densities. Remnant Leakers show properties of density-bounded nebulae, having normal ionization parameters but much lower HII region densities. Both types of leaker exhibit [CII]$_{\rm 158\mu m}$ deficits on the [CII]-SFR$_{100}$ relation, while only Bursty Leakers show deficits when SFR$_{10}$ is used. We predict that [CII] luminosity and SFR indicators such as H$\alpha$ and M$_{\rm 1500\r{A}}$ can be combined to identify both types of LyC leaker and the mode by which photons are escaping. These predictions can be tested with [CII] observations of known $z=3-4$ LyC leakers. Finally, we show that leakers with $f_{\rm esc}>20\%$ dominate the ionizing photon budget at $z\gtrsim7.5$ but the contribution from galaxies with $f_{\rm esc}<5\%$ becomes significant at the tail-end of reionization.
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What it cites · 4 sentences without a confident label
Cites as background 3 papers
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These include high O$_32$ ratios [ref] , Ly$α$ peak separations [ref] , SII deficits [ref] , MgII doublet flux ratios [ref] , strong C iv emission [ref] , the combination of H$β$ and UV slope [ref] , etc.
Strong C IV emission from star-forming galaxies: a case for high Lyman continuum photon escape · Introduction · 0.86
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These include the impact of the CMB and low metallicity [ref] , radiation field intensity [ref] , and bursty star formation [ref] .
A survey of high-$z$ galaxies: SERRA simulations · Implications for [CII] 158$μ$m Emission · 0.97
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Rather observational studies of $f_esc$ often target lower redshift analogues of high-redshift galaxies at $z∼0$ [ref] , $z∼3$ [ref] , and more recently at $z∼1.5$ [ref] .
The Low-Redshift Lyman Continuum Survey I: New, Diverse Local Lyman-Continuum Emitters · Introduction · 0.86
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