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Title: REVISITING THE FIRST GALAXIES: THE EPOCH OF POPULATION III STARS

We investigate the transition from primordial Population III (Pop III) star formation to normal Pop II star formation in the first galaxies using new cosmological hydrodynamic simulations. We find that while the first stars seed their host galaxies with metals, they cannot sustain significant outflows to enrich the intergalactic medium, even assuming a top-heavy initial mass function. This means that Pop III star formation could potentially continue until z Almost-Equal-To 6 in different unenriched regions of the universe, before being ultimately shut off by cosmic reionization. Within an individual galaxy, the metal production and stellar feedback from Pop II stars overtake Pop III stars in 20-200 Myr, depending on galaxy mass.
Authors:
; ;  [1] ;  [2]
  1. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States)
  2. Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)
Publication Date:
OSTI Identifier:
22140302
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 773; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; EVOLUTION; FEEDBACK; GALAXIES; HYDRODYNAMICS; MASS; METALS; SIMULATION; STARS; UNIVERSE