Assuming Ionization Equilibrium and the Impact on the Ly alpha Forest Power Spectrum during the End of Reionization at 8 >= z >= 5

Samir Kusmic; Kristian Finlator; Laura Keating; Ezra Huscher

doi:10.3847/1538-4357/ac66e3

Assuming Ionization Equilibrium and the Impact on the Ly alpha Forest Power Spectrum during the End of Reionization at 8 >= z >= 5

Samir Kusmic^*
, Kristian Finlator
, Laura Keating
, Ezra Huscher

^*Corresponding author af dette arbejde

The Cosmic Dawn Center

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

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Abstract

We explore how the assumption of ionization equilibrium modulates the modeled intergalactic medium at the end of the hydrogen epoch of reionization using the cosmological radiation hydrodynamic Technicolor Dawn simulation. In neutral and partially ionized regions where the metagalactic ultraviolet background is weak, the ionization timescale t (ion) equivalent to Gamma(-1) exceeds the Hubble time. Assuming photoionization equilibrium in such regions artificially boosts the ionization rate, accelerating reionization. By contrast, the recombination time t (rec) < t (ion) in photoionized regions, with the result that assuming photoionization equilibrium artificially increases the neutral hydrogen fraction. Using snapshots in the range 8 >= z >= 5, we compare the predicted Ly alpha forest (LAF) flux power spectrum with and without the assumption of ionization equilibrium. Small scales (k > 0.1 rad s km(-1)) exhibit reduced power from 7

Originalsprog	Engelsk
Artikelnummer	46
Tidsskrift	Astrophysical Journal
Vol/bind	931
Udgave nummer	1
Antal sider	13
ISSN	0004-637X
DOI	https://doi.org/10.3847/1538-4357/ac66e3
Status	Udgivet - 1 maj 2022

Finansiering

We want to thank Caitlin Doughty for reviewing our draft and improving the writing. S.K. is supported by the National Science Foundation (NSF) under award No. 2006550. The Technicolor Dawn simulations were enabled by the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by NSF grant No. ACI-1548562. The Cosmic Dawn Center is funded by the Danish National Research Foundation. L.K. was supported by the European Union's Horizon 2020 research and innovation program under Marie Skodowska-Curie grant agreement No. 885990.

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AU - Kusmic, Samir

AU - Finlator, Kristian

AU - Keating, Laura

AU - Huscher, Ezra

PY - 2022/5/1

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AB - We explore how the assumption of ionization equilibrium modulates the modeled intergalactic medium at the end of the hydrogen epoch of reionization using the cosmological radiation hydrodynamic Technicolor Dawn simulation. In neutral and partially ionized regions where the metagalactic ultraviolet background is weak, the ionization timescale t (ion) equivalent to Gamma(-1) exceeds the Hubble time. Assuming photoionization equilibrium in such regions artificially boosts the ionization rate, accelerating reionization. By contrast, the recombination time t (rec) < t (ion) in photoionized regions, with the result that assuming photoionization equilibrium artificially increases the neutral hydrogen fraction. Using snapshots in the range 8 >= z >= 5, we compare the predicted Ly alpha forest (LAF) flux power spectrum with and without the assumption of ionization equilibrium. Small scales (k > 0.1 rad s km(-1)) exhibit reduced power from 7

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KW - PHYSICAL CONDITIONS

KW - GALAXY FORMATION

KW - EVOLUTION

KW - FEEDBACK

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