The First Galaxies: Assembly under Radiative Feedback from the First Stars
Andreas H. Pawlik, Milos Milosavljevic, Volker Bromm

TL;DR
This study uses cosmological simulations to show how radiative feedback from the first stars suppresses gas condensation and star formation in early dwarf galaxies, significantly affecting their dark matter profiles and evolution.
Contribution
It provides the first detailed simulation-based analysis of radiative feedback effects on the assembly of the first dwarf galaxies, including the impact on dark matter and star formation.
Findings
Radiative feedback strongly suppresses gas condensation and star formation.
Dark matter densities in minihalos are reduced by factors of a few due to feedback.
Extended disks form robustly regardless of radiation effects.
Abstract
We investigate how radiative feedback from the first stars affects the assembly of the first dwarf galaxies. We perform cosmological zoomed SPH simulations of a dwarf galaxy assembling inside a halo of virial mass 10^9 solar at z = 10. The simulations follow the non-equilibrium chemistry/cooling of primordial gas and the conversion of the gas into metal-free stars. To quantify the radiative feedback, we compare a simulation in which stars emit both molecular hydrogen dissociating and hydrogen/helium ionizing radiation with a simulation in which stars emit only dissociating radiation, and with a simulation in which stars remain dark. Photodissociation and -ionization exert a strong negative feedback on the assembly of the simulated galaxy. Gas condensation is strongly impeded, and star formation is strongly suppressed in comparison with the simulation in which stars remain dark. The…
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