The z=0 HI column-density distribution function has been measured for the first time down to 10^17.8 cm^-2 from 1-kpc-resolution 21-cm images, showing modest evolution since z~3 at LLS-like densities.
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FEASTS and MHONGOOSE: HI Column Density Distribution at $z=0$ for $N_\mathrm{HI}>10^{17.8}\, \mathrm{cm}^{-2}$
The z=0 HI column-density distribution function has been measured for the first time down to 10^17.8 cm^-2 from 1-kpc-resolution 21-cm images, showing modest evolution since z~3 at LLS-like densities.