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The ability of primordial gas to cool in proto-galactic haloes exposed to Lyman-Werner (LW) radiation is critically dependent on the self-shielding of H₂. We perform radiative transfer calculations of LW line photons, post-processing outputs from three-dimensional adaptive mesh refinement (AMR) simulations of haloes with Tᵥir > 10⁴ K at redshifts around z=10. We calculate the optically thick photodissociation rate numerically, including the effects of density, temperature, and velocity gradients in the gas, as well as line overlap and shielding of H₂ by HI, over a large number of sight-lines. In low-density regions (n10⁴ K haloes by an order of magnitude; this increases the number of such haloes in which supermassive (approx. M=10⁵ Mₛun) black holes may have formed.
Wolcott-Green et al. (Tue,) studied this question.
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