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The HEASARC and NuSTAR teams are greatly saddened by the sudden passing of Katja Pottschmidt. Most recently Katja was the lead scientist for the NuSTAR Guest Observer Facility (GOF), a role she had supported for many years. During her science career she worked on many other high energy astrophysics missions and played an integral role in advancing our knowledge of the universe. She was a wonderful colleague and friend and will be keenly missed by all who knew her.

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pcfabs, zpcfabs: partial covering fraction absorption

A partial covering fraction absorption. The relative abundances are set by the abund command.

$\displaystyle M(E) = f \exp[-\eta_H \sigma(E)] + (1-f) $
where $\sigma(E)$ is the photo-electric cross-section (NOT including Thomson scattering) (see phabs) and:

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2=f dimensionless covering fraction $(0<f\leq 1)$

The redshifted variant zpcfabs is given by:

$\displaystyle M(E) = f \exp\left[-\eta_H \sigma(E[1+z])\right] + 1-f $

where $\sigma(E)$ is the photo-electric cross-section (NOT including Thomson scattering) (see phabs). Relative abundances are as for pcfabs. Parameters are:

par1=$\eta_H$ equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2=f dimensionless covering fraction $(0<f\leq 1)$
par3=z redshift