TY - JOUR
T1 - Cosmic Dawn II (CoDa II)
T2 - A new radiation-hydrodynamics simulation of the self-consistent coupling of galaxy formation and reionization
AU - Ocvirk, Pierre
AU - Aubert, Dominique
AU - Sorce, Jenny G.
AU - Shapiro, Paul R.
AU - Deparis, Nicolas
AU - Dawoodbhoy, Taha
AU - Lewis, Joseph
AU - Teyssier, Romain
AU - Yepes, Gustavo
AU - Gottlöber, Stefan
AU - Ahn, Kyungjin
AU - Iliev, Ilian T.
AU - Hoffman, Yehuda
N1 - Funding Information: ITI was supported by the Science and Technology Facilities Council [grant number ST/L000652/1]. JS acknowledges support from the ‘l’Oréal-UNESCO Pour les femmes et la Science’ and the ‘Centre National d’Études Spatiales (CNES)’ postdoctoral fellowship programs. YH has been partially supported by the Israel Science Foundation (1013/12). KA was supported by National Research Foundation grants NRF-2016R1D1A1B04935414 and NRF-2016R1A5A1013277 GY also acknowledges support from Ministerio de Economia Industria y Competitividad and Fondo Europeo de Desarrollo Regional (MINECO–FEDER) under research grants AYA2012-31101, AYA2015-63810-P, and AYA2015-63810-P, as well as Ministerio de Ciencia, Innovacion y Universidades (MICIU/FEDER) under grant PGC2018-094975-C21. Funding Information: PRS was supported in part by U.S. National Science Foundation (NSF) grant AST-1009799, National Aeronautics and Space Administration (NASA) grant NNX11AE09G, NASA/Jet Propulsion Laboratory grant RSA Nos. 1492788 and 1515294, and supercomputer resources from NSF XSEDE grant TG-AST090005 and the Texas Advanced Computing Center (TACC) at the University of Texas at Austin. PO thanks Y. Dubois, F. Roy, and Y. Rasera for their precious help dealing with SN feedback in RAMSES and various hacks in pFoF. This work made use of v2.1 of the Binary Population and Spectral Synthesis (BPASS) models as last described in Eldridge et al. (2017). Publisher Copyright: © 2020 The Author(s).
PY - 2020/8/1
Y1 - 2020/8/1
N2 - 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 108M. 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.
AB - 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 108M. 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.
KW - Galaxies: formation
KW - Galaxies: high-redshift
KW - Intergalactic medium
KW - Local Group
KW - Methods: numerical
KW - Radiative transfer
UR - http://www.scopus.com/inward/record.url?scp=85095416596&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85095416596&partnerID=8YFLogxK
U2 - https://doi.org/10.1093/mnras/staa1266
DO - https://doi.org/10.1093/mnras/staa1266
M3 - Article
SN - 0035-8711
VL - 496
SP - 4087
EP - 4107
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -