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19962023
most citedSparsePak: A Formatted Fiber Field Unit for The WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration

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astro-ph1999★ 18 cited

The HI Column Density Distribution Function at z=0: the Connection to Damped Ly alpha Statistics

Martin Zwaan, Marc Verheijen, Frank Briggs

We present a measurement of the HI column density distribution function, f(N), at the present epoch for column densities log N > 20 cm^-2. These high column densities compare to th…