Self-consistent Modeling of Reionization in Cosmological Hydrodynamical Simulations

Oñorbe, Jose; Hennawi, Joseph F.; Lukić, Zarija

doi:10.3847/1538-4357/aa6031

Self-consistent Modeling of Reionization in Cosmological Hydrodynamical Simulations

Journal Article · Tue Mar 07 23:00:00 EST 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aa6031· OSTI ID:1379770

^[1]; Hennawi, Joseph F. ^[1]; Lukić, Zarija ^[2]

Max Planck Inst. for Astronomy, Heidelberg (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The ultraviolet background (UVB) emitted by quasars and galaxies governs the ionization and thermal state of the intergalactic medium (IGM), regulates the formation of high-redshift galaxies, and is thus a key quantity for modeling cosmic reionization. The vast majority of cosmological hydrodynamical simulations implement the UVB via a set of spatially uniform photoionization and photoheating rates derived from UVB synthesis models. In this paper, we show that simulations using canonical UVB rates reionize and, perhaps more importantly, spuriously heat the IGM, much earlier ($$z\sim 15$$) than they should. This problem arises because at $$z\gt 6$$, where observational constraints are nonexistent, the UVB amplitude is far too high. We introduce a new methodology to remedy this issue, and we generate self-consistent photoionization and photoheating rates to model any chosen reionization history. Following this approach, we run a suite of hydrodynamical simulations of different reionization scenarios and explore the impact of the timing of reionization and its concomitant heat injection on the thermal state of the IGM. We present a comprehensive study of the pressure smoothing scale of IGM gas, illustrating its dependence on the details of both hydrogen and helium reionization, and argue that it plays a fundamental role in interpreting Lyα forest statistics and the thermal evolution of the IGM. The premature IGM heating we have uncovered implies that previous work has likely dramatically overestimated the impact of photoionization feedback on galaxy formation, which sets the minimum halo mass able to form stars at high redshifts. Finally, we make our new UVB photoionization and photoheating rates publicly available for use in future simulations.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Alexander von Humboldt Foundation (Germany); Federal Ministry of Education and Research (BMBF) (Germany)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379770

Alternate ID(s):: OSTI ID: 22869243

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 837; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Fully-Coupled Simulation of Cosmic Reionization. I: Numerical Methods and Tests Norman, Michael L.; Reynolds, Daniel R.; So, Geoffrey C. arXiv https://doi.org/10.48550/arxiv.1306.0645	text	January 2013
Reionization Histories of Milky Way Mass Halos Li, Tony Y.; Alvarez, Marcelo A.; Wechsler, Risa H. arXiv https://doi.org/10.48550/arxiv.1306.2971	text	January 2013
The one-dimensional Ly-alpha forest power spectrum from BOSS Palanque-Delabrouille, Nathalie; Yèche, Christophe; Borde, Arnaud arXiv https://doi.org/10.48550/arxiv.1306.5896	text	January 2013
A consistent determination of the temperature of the intergalactic medium at redshift z=2.4 Bolton, James S.; Becker, George D.; Haehnelt, Martin G. arXiv https://doi.org/10.48550/arxiv.1308.4411	text	January 2013
Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation Hopkins, Philip F.; Keres, Dusan; Onorbe, Jose arXiv https://doi.org/10.48550/arxiv.1311.2073	text	January 2013
Recombination clumping factor during cosmic reionization Kaurov, Alexander A.; Gnedin, Nickolay Y. arXiv https://doi.org/10.48550/arxiv.1311.2594	text	January 2013
Non-equilibrium chemistry and cooling in the diffuse interstellar medium - I. Optically thin regime Richings, Alexander J.; Schaye, Joop; Oppenheimer, Benjamin D. arXiv https://doi.org/10.48550/arxiv.1401.4719	text	January 2014
Non-equilibrium chemistry and cooling in the diffuse interstellar medium - II. Shielded gas Richings, Alexander J.; Schaye, Joop; Oppenheimer, Benjamin D. arXiv https://doi.org/10.48550/arxiv.1403.6155	text	January 2014
Near-Field Limits on the Role of Faint Galaxies in Cosmic Reionization Boylan-Kolchin, Michael; Bullock, James S.; Garrison-Kimmel, Shea arXiv https://doi.org/10.48550/arxiv.1405.1040	text	January 2014
Early and Extended Helium Reionization Over More Than 600 Million Years of Cosmic Time Worseck, Gábor; Prochaska, J. Xavier; Hennawi, Joseph F. arXiv https://doi.org/10.48550/arxiv.1405.7405	text	January 2014
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A universal angular momentum profile for galactic halos Bullock, James S.; Dekel, Avishai; Kolatt, Tsafrir S. arXiv https://doi.org/10.48550/arxiv.astro-ph/0011001	text	January 2000
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Radiative Transfer Effects during Photoheating of the Intergalactic Medium Abel, Tom; Haehnelt, Martin G. arXiv https://doi.org/10.48550/arxiv.astro-ph/9903102	text	January 1999
Faint dwarfs as a test of DM models: WDM versus CDM Governato, Fabio; Weisz, Daniel; Pontzen, Andrew Oxford University Press https://doi.org/10.5167/uzh-121992	text	January 2015
Cosmic Dawn (CoDa): the first radiation-hydrodynamics simulation of reionization and galaxy formation in the Local Universe Ocvirk, Pierre; Gillet, Nicolas; Shapiro, Paul R. Oxford University Press https://doi.org/10.5167/uzh-129969	text	January 2016
Dependence of the local reionization history on halo mass and environment: did Virgo reionize the Local Group? Weinmann, Simone M.; Macciò, Andrea V.; Iliev, Ilian T. Oxford University Press https://doi.org/10.5167/uzh-154503	text	January 2007
The photoheating of the intergalactic medium in synthesis models of the UV background Ewald, Puchwein,; S., Bolton, James; G., Haehnelt, Martin Oxford University Press https://doi.org/10.5167/uzh-154882	text	January 2015
Fossil remnants of reionization in the halo of the milky way P., Madau,; M., Kuhlen,; J., Diemand, IOP Publishing https://doi.org/10.5167/uzh-16551	text	January 2008
The baryon cycle of dwarf galaxies: dark, bursty, gas-rich polluters Shen, Sijing; Madau, Piero; Conroy, Charlie IOP Publishing https://doi.org/10.5167/uzh-98785	text	January 2014

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New constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-α forest data Irsic, Vid; Viel, M.; Haehnelt, Martin Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.28062	text	January 2017
Consistent modelling of the meta-galactic UV background and the thermal/ionization history of the intergalactic medium Puchwein, Ewald; Haardt, F.; Haehnelt, Martin Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.36309	text	January 2019
A New Precision Measurement of the Small-scale Line-of-sight Power Spectrum of the Ly α Forest Walther, Michael; Hennawi, Joseph F.; Hiss, Hector The Astrophysical Journal, Vol. 852, Issue 1 https://doi.org/10.3847/1538-4357/aa9c81	journal	December 2017
A Fundamental Test for Galaxy Formation Models: Matching the Lyman- α Absorption Profiles of Galactic Halos Over Three Decades in Distance Sorini, Daniele; Oñorbe, José; Hennawi, Joseph F. The Astrophysical Journal, Vol. 859, Issue 2 https://doi.org/10.3847/1538-4357/aabb52	journal	May 2018
Modeling the He ii Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration Schmidt, Tobias M.; Hennawi, Joseph F.; Worseck, Gábor The Astrophysical Journal, Vol. 861, Issue 2 https://doi.org/10.3847/1538-4357/aac8e4	journal	July 2018
A New Measurement of the Temperature–density Relation of the IGM from Voigt Profile Fitting Hiss, Hector; Walther, Michael; Hennawi, Joseph F. The Astrophysical Journal, Vol. 865, Issue 1 https://doi.org/10.3847/1538-4357/aada86	journal	September 2018
New Constraints on IGM Thermal Evolution from the Ly α Forest Power Spectrum Walther, Michael; Oñorbe, Jose; Hennawi, Joseph F. The Astrophysical Journal, Vol. 872, Issue 1 https://doi.org/10.3847/1538-4357/aafad1	journal	February 2019
Dancing in the Dark: Uncertainty in Ultrafaint Dwarf Galaxy Predictions from Cosmological Simulations Munshi, Ferah; Brooks, Alyson M.; Christensen, Charlotte The Astrophysical Journal, Vol. 874, Issue 1 https://doi.org/10.3847/1538-4357/ab0085	journal	March 2019
The Evolution of the He ii-ionizing Background at Redshifts 2.3 < z < 3.8 Inferred from a Statistical Sample of 24 HST /COS He ii Ly α Absorption Spectra Worseck, Gábor; Davies, Frederick B.; Hennawi, Joseph F. The Astrophysical Journal, Vol. 875, Issue 2 https://doi.org/10.3847/1538-4357/ab0fa1	journal	April 2019
A Novel Statistical Method for Measuring the Temperature–Density Relation in the IGM Using the b – N _{H i} Distribution of Absorbers in the Ly α Forest Hiss, Hector; Walther, Michael; Oñorbe, Jose The Astrophysical Journal, Vol. 876, Issue 1 https://doi.org/10.3847/1538-4357/ab1418	journal	May 2019
Anomaly in the Opacity of the Post-reionization Intergalactic Medium in the Ly α and Ly β Forest Eilers, Anna-Christina; Hennawi, Joseph F.; Davies, Frederick B. The Astrophysical Journal, Vol. 881, Issue 1 https://doi.org/10.3847/1538-4357/ab2b3f	journal	August 2019
Mapping Quasar Light Echoes in 3D with Ly α Forest Tomography Schmidt, Tobias M.; Hennawi, Joseph F.; Lee, Khee-Gan The Astrophysical Journal, Vol. 882, Issue 2 https://doi.org/10.3847/1538-4357/ab2fcb	journal	September 2019
A New Measurement of the Temperature Density Relation of the IGM From Voigt Profile Fitting Hiss, Hector; Walther, Michael; Hennawi, Joseph F. arXiv https://doi.org/10.48550/arxiv.1710.00700	text	January 2017
New synthesis models of consistent extragalactic background light over cosmic time Khaire, Vikram; Srianand, Raghunathan arXiv https://doi.org/10.48550/arxiv.1801.09693	text	January 2018
The Local Group on FIRE: Dwarf galaxy populations across a suite of hydrodynamic simulations Garrison-Kimmel, Shea; Hopkins, Philip F.; Wetzel, Andrew arXiv https://doi.org/10.48550/arxiv.1806.04143	text	January 2018
Inhomogeneous Reionization Models in Cosmological Hydrodynamical Simulations Oñorbe, Jose; Davies, F. B.; Lukić, Z. arXiv https://doi.org/10.48550/arxiv.1810.11683	text	January 2018

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