Radiative effects during the assembly of direct collapse black holes
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2017)
摘要
We perform a post-processing radiative feedback analysis on a 3D ab initio cosmological simulation of an atomic cooling halo under the direct collapse black hole (DCBH) scenario. We maintain the spatial resolution of the simulation by incorporating native ray-tracing on unstructured mesh data, including Monte Carlo Lyman alpha (Ly alpha) radiative transfer. DCBHs are born in gas-rich, metal-poor environments with the possibility of Compton-thick conditions, N-H greater than or similar to 10(24) cm(-2). Therefore, the surrounding gas is capable of experiencing the full impact of the bottled-up radiation pressure. In particular, we find that multiple scattering of Ly alpha photons provides an important source of mechanical feedback after the gas in the sub-parsec region becomes partially ionized, avoiding the bottleneck of destruction via the two-photon emission mechanism. We provide detailed discussion of the simulation environment, expansion of the ionization front, emission and escape of Ly alpha radiation, and Compton scattering. A sink particle prescription allows us to extract approximate limits on the post-formation evolution of the radiative feedback. Fully coupled Ly alpha radiation hydrodynamics will be crucial to consider in future DCBH simulations.
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关键词
radiative transfer,galaxies: formation,galaxies: high-redshift,cosmology: theory
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