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simplcut ⚬ˣˢᵖᵉᶜ｜Documentation｜1st｜20251021153721-00-⌔

simplcut – James F. (“Jack”) Steiner

simplcut

simplcut is an extension of the simpl scattering kernel.

**Important Note! ** – For either simpl or simplcut, you should use the “energies” command to define a broad energy grid over which the photons are redistributed. ** ** This should sufficiently cover both the seed distribution and ideally extend above a high-energy cutoff. E.g., “energies 0.01 1000. 1000 log” gives ~1% energy resolution in the grid from 10eV to 1 MeV.

The model parameters are given below:

1. Gamma (spectral index)
   2. fsc (scattered fraction) ****
   3. ReflFrac (Reflection Fraction. Negative values omit the transmitted and return just the scattered spectrum.) ****
   4. Energy Turnover (Exponential cutoff E${}_{cut}$ when negative, kT${}_e$ when positive using nthcomp as an engine.) ****
   ****

simplcut can be compiled using “xspec – go” from the command line in the installation directory. A tarball of the package is provided below.

Model Files:
simplcut-package

Printed 2026-06-28.

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