%0 Generic %1 rosdahl2022escape %A Rosdahl, Joakim %A Blaizot, Jérémy %A Katz, Harley %A Kimm, Taysun %A Garel, Thibault %A Haehnelt, Martin %A Keating, Laura C. %A Martin-Alvarez, Sergion %A Michel-Dansac, Léo %A Ocvirk, Pierre %D 2022 %K library %T LyC escape from SPHINX galaxies in the Epoch of Reionization %U http://arxiv.org/abs/2207.03232 %X We measure escape fractions, $f_esc$, of ionizing radiation from galaxies in the SPHINX suite of cosmological radiation-hydrodynamical simulations of reionization, resolving halos with $M_vir 7.5 10^7 \ M_ødot$ with a minimum cell width of $10$ pc. Our new and largest $20$ co-moving Mpc wide volume contains tens of thousands of star-forming galaxies with halo masses up to a few times $10^11 \ M_ødot$. The simulated galaxies agree well with observational constraints of the UV luminosity function in the Epoch of Reionization. The escape fraction fluctuates strongly in individual galaxies over timescales of a few Myrs, due to its regulation by supernova and radiation feedback, and at any given time a tiny fraction of star-forming galaxies emits a large fraction of the ionizing radiation escaping into the inter-galactic medium. Statistically, $f_esc$ peaks in intermediate-mass, intermediate-brightness, and low-metallicity galaxies ($M_* 10^7 \ M_ødot$, $M_1500 -17$, $Złesssim 5 10^-3 \ Z_ødot$), dropping strongly for lower and higher masses, brighter and dimmer galaxies, and more metal-rich galaxies. The escape fraction correlates positively with both the short-term and long-term specific star formation rate. According to SPHINX, galaxies too dim to be yet observed, with $M_1500 -17$, provide about $55$ percent of the photons contributing to reionization. The global averaged $f_esc$ naturally decreases with decreasing redshift, as predicted by UV background models and low-redshift observations. This evolution is driven by decreasing specific star formation rates over cosmic time.

@misc{rosdahl2022escape, abstract = {We measure escape fractions, $f_{\rm esc}$, of ionizing radiation from galaxies in the SPHINX suite of cosmological radiation-hydrodynamical simulations of reionization, resolving halos with $M_{\rm vir} \gtrapprox 7.5 \times 10^7 \ M_{\odot}$ with a minimum cell width of $\approx 10$ pc. Our new and largest $20$ co-moving Mpc wide volume contains tens of thousands of star-forming galaxies with halo masses up to a few times $10^{11} \ M_{\odot}$. The simulated galaxies agree well with observational constraints of the UV luminosity function in the Epoch of Reionization. The escape fraction fluctuates strongly in individual galaxies over timescales of a few Myrs, due to its regulation by supernova and radiation feedback, and at any given time a tiny fraction of star-forming galaxies emits a large fraction of the ionizing radiation escaping into the inter-galactic medium. Statistically, $f_{\rm esc}$ peaks in intermediate-mass, intermediate-brightness, and low-metallicity galaxies ($M_{*} \approx 10^7 \ M_{\odot}$, $M_{1500} \approx -17$, $Z\lesssim 5 \times 10^{-3} \ Z_{\odot}$), dropping strongly for lower and higher masses, brighter and dimmer galaxies, and more metal-rich galaxies. The escape fraction correlates positively with both the short-term and long-term specific star formation rate. According to SPHINX, galaxies too dim to be yet observed, with $M_{1500} \gtrapprox -17$, provide about $55$ percent of the photons contributing to reionization. The global averaged $f_{\rm esc}$ naturally decreases with decreasing redshift, as predicted by UV background models and low-redshift observations. This evolution is driven by decreasing specific star formation rates over cosmic time.}, added-at = {2022-07-08T07:49:07.000+0200}, author = {Rosdahl, Joakim and Blaizot, Jérémy and Katz, Harley and Kimm, Taysun and Garel, Thibault and Haehnelt, Martin and Keating, Laura C. and Martin-Alvarez, Sergion and Michel-Dansac, Léo and Ocvirk, Pierre}, biburl = {https://www.bibsonomy.org/bibtex/24866fc4c16ec33626ecf42358448def3/gpkulkarni}, description = {LyC escape from SPHINX galaxies in the Epoch of Reionization}, interhash = {14298cb17cd4ba5bada8d14958137789}, intrahash = {4866fc4c16ec33626ecf42358448def3}, keywords = {library}, note = {cite arxiv:2207.03232Comment: 20 figures, 21 pages plus appendices. Accepted for publication in MNRAS}, timestamp = {2022-07-08T07:49:07.000+0200}, title = {LyC escape from SPHINX galaxies in the Epoch of Reionization}, url = {http://arxiv.org/abs/2207.03232}, year = 2022 }