%0 Generic %1 hutter2020astraeus %A Hutter, Anne %A Dayal, Pratika %A Legrand, Laurent %A Gottlöber, Stefan %A Yepes, Gustavo %D 2020 %K library %T Astraeus III: The environment and physical properties of reionization sources %U http://arxiv.org/abs/2008.13215 %X In this work, we use the ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dArk mattEr simUlationS) framework which couples galaxy formation and reionization in the first billion years. Exploring a number of models for reionization feedback and the escape fraction of ionizing radiation from the galactic environment ($f_esc$), we quantify how the contribution of star-forming galaxies to reionization depends on the radiative feedback model, $f_esc$, and the environmental over-density. Our key findings are: (i) for constant $f_esc$ models, intermediate-mass galaxies (with halo masses of $M_h\simeq10^9-11$M$_ødot$ and absolute UV magnitudes of $M_UV -15$ to $-20$) in intermediate-density regions drive reionization; (iii) scenarios where $f_esc$ increases with decreasing halo mass shift the galaxy population driving reionization to lower-mass galaxies ($M_h<10^9.5$M$_ødot$) with lower luminosities ($M_UV>-16$) and over-densities; (iii) reionization imprints its topology on the ionizing emissivity of low-mass galaxies ($M_h<10^9$M$_ødot$) through radiative feedback. Galaxies in over-dense regions (that are reionized earlier) experience a stronger suppression of star formation by radiative feedback and show lower ionizing emissivities; (iv) therefore, a change in $f_esc$ with galaxy properties has the largest impact on the sources of reionization and their detectability, with the radiative feedback strength and environmental over-density playing a sub-dominant role; (v) JWST-surveys (with a limiting magnitude of $M_UV = -16$) will be able to detect the galaxies providing $\sim60\%$ ($\sim20\%$) of reionization photons at $z=7$ for constant $f_esc$ models (scenarios where $f_esc$ increases with decreasing halo mass).

@misc{hutter2020astraeus, abstract = {In this work, we use the ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dArk mattEr simUlationS) framework which couples galaxy formation and reionization in the first billion years. Exploring a number of models for reionization feedback and the escape fraction of ionizing radiation from the galactic environment ($f_\mathrm{esc}$), we quantify how the contribution of star-forming galaxies to reionization depends on the radiative feedback model, $f_\mathrm{esc}$, and the environmental over-density. Our key findings are: (i) for constant $f_\mathrm{esc}$ models, intermediate-mass galaxies (with halo masses of $M_h\simeq10^{9-11}$M$_\odot$ and absolute UV magnitudes of $M_{UV} \sim -15$ to $-20$) in intermediate-density regions drive reionization; (iii) scenarios where $f_\mathrm{esc}$ increases with decreasing halo mass shift the galaxy population driving reionization to lower-mass galaxies ($M_h<10^{9.5}$M$_\odot$) with lower luminosities ($M_{UV}>-16$) and over-densities; (iii) reionization imprints its topology on the ionizing emissivity of low-mass galaxies ($M_h<10^{9}$M$_\odot$) through radiative feedback. Galaxies in over-dense regions (that are reionized earlier) experience a stronger suppression of star formation by radiative feedback and show lower ionizing emissivities; (iv) therefore, a change in $f_\mathrm{esc}$ with galaxy properties has the largest impact on the sources of reionization and their detectability, with the radiative feedback strength and environmental over-density playing a sub-dominant role; (v) JWST-surveys (with a limiting magnitude of $M_{UV} = -16$) will be able to detect the galaxies providing $\sim60\%$ ($\sim20\%$) of reionization photons at $z=7$ for constant $f_\mathrm{esc}$ models (scenarios where $f_\mathrm{esc}$ increases with decreasing halo mass).}, added-at = {2020-09-01T11:43:13.000+0200}, author = {Hutter, Anne and Dayal, Pratika and Legrand, Laurent and Gottlöber, Stefan and Yepes, Gustavo}, biburl = {https://www.bibsonomy.org/bibtex/2d0b6eec8e7ba78e2c8b435d747e100e9/gpkulkarni}, description = {Astraeus III: The environment and physical properties of reionization sources}, interhash = {3d96c14d900a305114554ca1a826def2}, intrahash = {d0b6eec8e7ba78e2c8b435d747e100e9}, keywords = {library}, note = {cite arxiv:2008.13215Comment: 16 pages, 13 figures, submitted to MNRAS, comments welcome}, timestamp = {2020-09-01T11:43:13.000+0200}, title = {Astraeus III: The environment and physical properties of reionization sources}, url = {http://arxiv.org/abs/2008.13215}, year = 2020 }