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Article overview
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Revisiting The First Galaxies: The effects of Population III stars on their host galaxies | Alexander L. Muratov
; Oleg Y. Gnedin
; Nickolay Y. Gnedin
; Marcel Zemp
; | Date: |
5 Dec 2012 | Abstract: | We revisit the formation and evolution of the first galaxies using new
hydrodynamic cosmological simulations with the ART code. Our simulations
feature a recently developed model for H2 formation and dissociation, and a
star formation recipe that is based on molecular rather than atomic gas. Here,
we develop and implement a new recipe for the formation of metal-free
Population III stars. We find the epoch during which Pop III stars dominated
the energy and metal budget of the first galaxies to be short-lived. Galaxies
which host Pop III stars do not retain dynamical signatures of their thermal
and radiative feedback for more than 10^8 yr after the lives of the stars end
in pair-instability supernovae, even when we consider the maximum reasonable
efficiency of the feedback. Though metals ejected by the supernovae can travel
well beyond the virial radius of the host galaxy, they will typically begin to
fall back quickly, and do not enrich a large fraction of the intergalactic
medium. Galaxies more massive than 3 x 10^6 Msun re-accrete most of their
baryons and transition to metal-enriched Pop II star formation. | Source: | arXiv, 1212.0909 | Services: | Forum | Review | PDF | Favorites |
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