2012

Star Formation in the First Galaxies I: Collapse Delayed by Lyman-Werner Radiation

Safranek-Shrader, Chalence, Agarwal, Meghann, Federrath, Christoph et al.

Understand

We investigate the process of metal-free star formation in the first galaxies with a high-resolution cosmological simulation.

We consider the cosmologically motivated scenario in which a strong molecule-destroying Lyman-Werner (LW) background inhibits effective cooling in low-mass haloes, delaying star formation until the collapse or more massive haloes.
Only when molecular hydrogen (H2) can self-shield from LW radiation, which requires a halo capable of cooling by atomic line emission, will star formation be possible.
To follow the formation of multiple gravitationally bound objects, at high gas densities we introduce sink particles which accrete gas directly from the computational grid.

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