A Physical Upper Limit on the Hi Column Density of Gas Clouds

@inproceedings{Schaye2001APU,
  title={A Physical Upper Limit on the Hi Column Density of Gas Clouds},
  author={Joop Schaye},
  year={2001}
}
An intriguing fact about cosmic gas clouds is that they all ap pear to have neutral (atomic) hydrogen column densities smaller than 10 22 cm−2. Observations of damped Ly α (DLA) absorption systems further indicate that the maximumNHI decreases with increasing metallicity. It is generally ass umed that this trend is due to a dust-induced selection bias: DLA… CONTINUE READING