Reionization in technicolor

Kristian Finlator, Laura Keating, Benjamin D. Oppenheimer, Romeel S Dave, Erik Zackrisson

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We present the Technicolor Dawn simulations, a suite of cosmological radiation hydrodynamic simulations of the first 1.2 billion yr. By modelling a spatially inhomogeneous ultraviolet background (UVB) on the fly with 24 frequencies and resolving dark matter haloes down to 108 M⊙ within 12 h-1 Mpc volumes, our simulations unify observations of the intergalactic and circumgalactic media, galaxies, and reionization into a common framework. The only empirically tuned parameter, the fraction fesc, gal(z) of ionizing photons that escape the interstellar medium, is adjusted to match observations of the Lyman-α forest and the cosmic microwave background. With this single calibration, our simulations reproduce the history of reionization; the stellar mass and star formation rate relation of galaxies; the number density and metallicity of damped Lyman-α absorbers (DLAs) at z ~ 5; the abundance of weak metal absorbers; the ultraviolet background amplitude; and the Lyman-α flux power spectrum at z = 5.4. The galaxy stellar mass and ultraviolet luminosity functions are underproduced by ≤ 2 ×, suggesting an overly vigorous feedback model. The mean transmission in the Lyman-α forest is underproduced at z < 6, indicating tension between measurements of the UVB amplitude and Lyman-α transmission. The observed Si IV column density distribution is reasonably well reproduced (~1σ low). By contrast, CIV remains significantly underproduced despite being boosted by an intense > 4 Ryd UVB. Solving this problem by increasing metal yields would overproduce both weak absorbers and DLA metallicities. Instead, the observed strength of high-ionization emission from high-redshift galaxies and absorption from their environments suggest that the ionizing flux from conventional stellar population models is too soft.

Original languageEnglish (US)
Pages (from-to)2628-2649
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Volume480
Issue number2
DOIs
StatePublished - Oct 1 2018
Externally publishedYes

Fingerprint

absorbers
galaxies
stellar mass
metallicity
simulation
intergalactic media
problem solving
metal
star formation rate
metals
escape
power spectra
halos
dark matter
ionization
hydrodynamics
luminosity
histories
calibration
microwaves

Keywords

  • Dark ages
  • First stars
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: high-redshift
  • Intergalactic medium
  • Quasars: absorption lines
  • Reionization

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Finlator, K., Keating, L., Oppenheimer, B. D., Dave, R. S., & Zackrisson, E. (2018). Reionization in technicolor. Monthly Notices of the Royal Astronomical Society, 480(2), 2628-2649. https://doi.org/10.1093/MNRAS/STY1949

Reionization in technicolor. / Finlator, Kristian; Keating, Laura; Oppenheimer, Benjamin D.; Dave, Romeel S; Zackrisson, Erik.

In: Monthly Notices of the Royal Astronomical Society, Vol. 480, No. 2, 01.10.2018, p. 2628-2649.

Research output: Contribution to journalArticle

Finlator, K, Keating, L, Oppenheimer, BD, Dave, RS & Zackrisson, E 2018, 'Reionization in technicolor', Monthly Notices of the Royal Astronomical Society, vol. 480, no. 2, pp. 2628-2649. https://doi.org/10.1093/MNRAS/STY1949
Finlator K, Keating L, Oppenheimer BD, Dave RS, Zackrisson E. Reionization in technicolor. Monthly Notices of the Royal Astronomical Society. 2018 Oct 1;480(2):2628-2649. https://doi.org/10.1093/MNRAS/STY1949
Finlator, Kristian ; Keating, Laura ; Oppenheimer, Benjamin D. ; Dave, Romeel S ; Zackrisson, Erik. / Reionization in technicolor. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 480, No. 2. pp. 2628-2649.
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