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Reionization in Technicolor
New Mexico State University, Las Cruces, NM 88003-8001, USACosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø; DTU-Space, Technical University of Denmark, DK-2800 Kgs. Lyngby .
Canadian Institute for Theoretical Astrophysics, 60 St. George Street, University of Toronto, ON M5S 3H8, Canada .
CASA, Department of Astrophysical and Planetary Sciences, University of Colorado, 389-UCB, Boulder, CO 80309, USA .
University of the Western Cape, Bellville, Cape Town 7535, South AfricaSouth African Astronomical Observatory, Observatory, Cape Town 7925, South AfricaAfrican Institute for Mathematical Sciences, Muizenberg, Cape Town 7945, South AfricaCenter for Computational Astrophysics, Simons Foundation, New York, NY 10010, USAInstitute for Astronomy, Royal Observatory, Edinburgh EH9 3HJ, UK .
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2018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 480, no 2, p. 2628-2649Article in journal (Refereed) Published
Abstract [en]

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 10(8) M-circle dot 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 f(esc,gal)(z) of ionizing photons that escape the interstellar medium, is adjusted to match observations of the Lyman-alpha 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-alpha absorbers (DLAs) at z similar to 5; the abundance of weak metal absorbers; the ultraviolet background amplitude; and the Lyman-a flux power spectrum at z = 5.4. The galaxy stellar mass and ultraviolet luminosity functions are underproduced by <= 2 x, suggesting an overly vigorous feedback model. The mean transmission in the Lyman-alpha forest is underproduced at z < 6, indicating tension between measurements of the UVB amplitude and Lyman-alpha transmission. The observed Si IV column density distribution is reasonably well reproduced (similar to 1 sigma low). By contrast, C IV 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.

Place, publisher, year, edition, pages
2018. Vol. 480, no 2, p. 2628-2649
Keywords [en]
galaxies: evolution, galaxies: formation, galaxies: high-redshift, intergalactic medium, quasars: absorption lines, dark ages, reionization, first stars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-370150DOI: 10.1093/mnras/sty1949ISI: 000449614800093OAI: oai:DiVA.org:uu-370150DiVA, id: diva2:1272560
Funder
Swedish National Space BoardAvailable from: 2018-12-19 Created: 2018-12-19 Last updated: 2018-12-21Bibliographically approved

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Zackrisson, Erik

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