Redshift Filtering by<i>Swift</i>Apparent X-Ray Column Density
Redshift Filtering by<i>Swift</i>Apparent X-Ray Column Density
We remark on the utility of an observational relation between the absorption column density in excess of the Galactic absorption column density, ΔNH = NH,fit - NH,gal, and redshift, z, determined from all 55 Swift-observed long bursts with spectroscopic redshifts as of 2006 December. The absorption column densities, NH,fit, are …