Cosmic Dawn II (CoDa II): a new radiation-hydrodynamics simulation of the self-consistent coupling of galaxy formation and reionization
Year: 2020
Type: article
Abstract: ABSTRACT Cosmic Dawn II (CoDa II) is a new, fully coupled radiation-hydrodynamics simulation of cosmic reionization and galaxy formation and their mutual impact, to redshift z < 6. With 40963 particles and cells in a 94 Mpc box, it is large enough to model global reionization and its feedback on galaxy formation while resolving all haloes above 108 M⊙. Using the same hybrid CPU–GPU code RAMSES–CUDATON as CoDa I in Ocvirk et al. (2016), CoDa II modified and re-calibrated the subgrid star formation algorithm, making reionization end earlier, at z ≳ 6, thereby better matching the observations of intergalactic Lyman α opacity from quasar spectra and electron-scattering optical depth from cosmic microwave background fluctuations. CoDa II predicts a UV continuum luminosity function in good agreement with observations of high-z galaxies, especially at z = 6. As in CoDa I, reionization feedback suppresses star formation in haloes below ∼2 × 109 M⊙, though suppression here is less severe, a possible consequence of modifying the star formation algorithm. Suppression is environment dependent, occurring earlier (later) in overdense (underdense) regions, in response to their local reionization times. Using a constrained realization of lambda cold dark matter constructed from galaxy survey data to reproduce the large-scale structure and major objects of the present-day Local Universe, CoDa II serves to model both global and local reionization. In CoDa II, the Milky Way and M31 appear as individual islands of reionization, i.e. they were not reionized by the progenitor of the Virgo cluster, or by nearby groups, or by each other.
Institutions: Centre National de la Recherche Scientifique, Observatoire astronomique de Strasbourg, Université de Strasbourg, Lyon 1 Université, École Normale Supérieure de Lyon, Leibniz Institute for Astrophysics Potsdam, Centre de Recherche Astrophysique de Lyon, The University of Texas at Austin, University of Zurich, Institute for Theoretical Physics, Universidad Autónoma de Madrid, Chosun University, University of Sussex, Hebrew University of Jerusalem
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, National Aeronautics and Space Administration, L'Oreal USA, University of Texas at Austin, Equipex, National Research Foundation, Agence Nationale de la Recherche, Partnership for Advanced Computing in Europe AISBL, Centre National d’Etudes Spatiales, Federación Española de Enfermedades Raras, Ministerio de Economía y Competitividad, Université de Strasbourg, Israel Science Foundation, Jet Propulsion Laboratory, Science and Technology Facilities Council, Leibniz-Gemeinschaft, European Regional Development Fund, National Supercomputing Center, Korea Institute of Science and Technology Information, Oak Ridge National Laboratory
Awards: Cosmic Reionization and its Feedback Effect on Galaxy Formation, G2558850677, G2630723826, G3014852138, G3242433901, G3927356395, G4279081818, G4293744215, G4369015928, THE UNIVERSE WAS REIONIZED BY REDSHIFT Z ~ 6 BY A SMALL FRACTION OF THE BARYONS IN THE UNIVERSE, WHICH RELEASED ENERGY FOLLOWING THEIR CONDENSATION O, G486334386, G6702880738, G6731467812, Hydrodynamics and radiation in galaxies of the early universe, Simulations of the formation of galaxies during the reionization, G8175975439, Astrophysics and Cosmology - Sussex Consolidated Grant, G8695307306, G87242835, G8937583488, G916826482, G919133822
OpenAlex ID: W4297918278