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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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edge, zedge: absorption edge

The edge model is absorption edge, given by

$\displaystyle M(E) = \begin{array}{ll} 1 & E \leq E_c\\ [.2cm]exp\left[-D(E/E_c)^{-3}\right] & E \geq E_c \end{array}$
where:

par1=$E_c$ threshold energy
par2=$D$ absorption depth at the threshold

The zedge model given by

$\displaystyle M(E) = \begin{array}{ll} 1 & E < E_c\\ [.2cm]exp\left(-D\left[E(1+z)/E_c\right]^3\right) & E > E_c \end{array}$
allows a redshift z where:

par1=$E_c$ threshold energy
par2=$D$ absorption depth at the threshold
par3=z redshift