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- W3191334185 abstract "Becker et al. 2021 measured the mean free path of Lyman limit photons in the IGM at $z=6$. The short value suggests that absorptions may have played a prominent role in reionization. Here we study physical properties of ionizing photon sinks in the wake of ionization fronts (I-fronts) using radiative hydrodynamic simulations. We quantify the contributions of gaseous structures to the Lyman limit opacity by tracking the column density distributions in our simulations. Within $Delta t = 10$ Myr of I-front passage, we find that self-shielding systems ($N_{rm HI} > 10^{17.2}$ cm$^{-2}$) are comprised of two distinct populations: (1) over-density $Delta sim 50$ structures in photo-ionization equilibrium with the ionizing background; (2) $Delta gtrsim 100$ density peaks with fully neutral cores. The self-shielding systems contribute more than half of the opacity at these times, but the IGM evolves considerably in $Delta t sim 100$ Myr as structures are flattened by pressure smoothing and photoevaporation. By $Delta t = 300$ Myr, they contribute $lesssim 10 %$ to the opacity in an average 1 Mpc$^3$ patch of the Universe. The percentage can be a factor of a few larger in over-dense patches, where more self-shielding systems survive. We quantify the characteristic masses and sizes of self-shielding structures. Shortly after I-front passage, we find $M=10^{4} - 10^8$ M$_odot$ and effective diameters $d_{rm eff} = 1 - 20$ ckpc$/h$. These scales increase as the gas relaxes. The picture herein presented may be different in dark matter models with suppressed small-scale power." @default.
- W3191334185 created "2021-08-16" @default.
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- W3191334185 date "2021-12-01" @default.
- W3191334185 modified "2023-10-01" @default.
- W3191334185 title "Hydrodynamic Response of the Intergalactic Medium to Reionization. II. Physical Characteristics and Dynamics of Ionizing Photon Sinks" @default.
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- W3191334185 doi "https://doi.org/10.3847/1538-4357/ac2eb9" @default.
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