The Column Density Distribution Function at z=0 from HI Selected Galaxies

@article{RyanWeber2003TheCD,
  title={The Column Density Distribution Function at z=0 from HI Selected Galaxies},
  author={Emma V. Ryan-Weber and R. L. Webster and Lister Staveley-Smith University of Melbourne and Atnf},
  journal={arXiv: Astrophysics},
  year={2003}
}
We have measured the column density distribution function, f(N), at z=0 using 21-cm HI emission from galaxies selected from a blind HI survey. f(N) is found to be smaller and flatter at z=0 than indicated by high-redshift measurements of Damped Lyman-alpha (DLA) systems, consistent with the predictions of hierarchical galaxy formation. The derived DLA number density per unit redshift, dn/dz =0.058, is in moderate agreement with values calculated from low-redshift QSO absorption line studies. We… Expand
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