2019
DOI: 10.3847/1538-4357/ab3794
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Cosmic Reionization On Computers: Reionization Histories of Present-day Galaxies

Abstract: We examine the reionization history of present-day galaxies by explicitly tracing the building blocks of halos from the Cosmic Reionization On Computers project. We track dark matter particles that belong to z = 0 halos and extract the neutral fractions at corresponding positions during rapid global reionization. The resulting particle reionization histories allow us to explore different definitions of a halo's reionization redshift and to account for the neutral content of the interstellar medium. Consistent … Show more

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Cited by 9 publications
(3 citation statements)
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“…The actual uncertainty in 𝑧 rei will be slightly larger because we do not account for uncertainties in modelling of galactic outflows, which will impact the number of luminous satellites. Even though our inferred 𝑧 rei range is quite wide, it is interesting to see that our inferred 𝑧 rei range agrees with the reionization redshift range of 𝑧 rei = 8.1 +0.4 −0.4 (95% confidence intervals) derived for the MW mass haloes by Zhu et al (2019) using the CROC simulations of reionization. Our constraint is also in qualitative agreement with results of the CoDa II simulations which show that outer regions of the MW and M31 Lagrangian regions are reionized at 𝑧 7 (Ocvirk et al 2020, see their Fig.…”
Section: Implications For Reionization Of the Local Environmentsupporting
confidence: 80%
“…The actual uncertainty in 𝑧 rei will be slightly larger because we do not account for uncertainties in modelling of galactic outflows, which will impact the number of luminous satellites. Even though our inferred 𝑧 rei range is quite wide, it is interesting to see that our inferred 𝑧 rei range agrees with the reionization redshift range of 𝑧 rei = 8.1 +0.4 −0.4 (95% confidence intervals) derived for the MW mass haloes by Zhu et al (2019) using the CROC simulations of reionization. Our constraint is also in qualitative agreement with results of the CoDa II simulations which show that outer regions of the MW and M31 Lagrangian regions are reionized at 𝑧 7 (Ocvirk et al 2020, see their Fig.…”
Section: Implications For Reionization Of the Local Environmentsupporting
confidence: 80%
“…These simulations can track the reionization process from early times through its completion and quantify the relative contribution of faint and bright galaxies to the ionization budget (e.g., , Gnedin & Kaurov 2014, Lewis et al 2020, Simulations also predict how the distributions of galaxy metallicities and ages influence the mass-dependent contribution of ionizing photons to the reionization process (e.g., Katz et al 2018). The detailed calculations can follow the histories of individual galaxies, and study how the reionization process affects regions around galaxies as a function of halo mass (Zhu et al 2019) . Also shown is a prediction from cosmological simulations for x HI constrained by the evolution of the Lyman-α forest transmitted flux power spectrum at z < 6, allowing for variations in the range of photo-ionization and photo-heating history (Villasenor et al 2021).…”
Section: Models Of High-redshift Galaxy Formation and Reionizationmentioning
confidence: 99%
“…Recently, t reion (r) was also used to efficiently generate models of the reionisation (Trac et al 2022). This parameter is also valuable in investigations of local variations of the reionisation scenario (Trac et al 2008;Battaglia et al 2013;Aubert et al 2018;Zhu et al 2019;Sorce et al 2022) and the consequences of an inhomogeneous reionisation. These local modulations of reionisation histories could possibly manifest themselves in the star formation histories of low-mass galaxies (Ocvirk et al 2020) or their spatial distribution (Ocvirk & Aubert 2011).…”
Section: Introductionmentioning
confidence: 99%